Techniques to Improve Heat Resistance of Biopolymer Films

A heat-resistant barrier polylactic acid composition, its use and its products for food packaging applications, particularly for coffee capsules. The composition comprises a blend of high and low-melting-point stereocomplexed polylactic acid (SCPLA) and polyhydroxyalkanoates (PHA) with added bio-based plasticizers. The SCPLA and PHA combination provides superior thermal resistance and gas barrier properties, while the bio-based plasticizers enhance biocompatibility and environmental sustainability. The SCPLA-PHA blend can be processed into a variety of packaging formats, including pellets, cast films, and injection-molded products, offering a comprehensive solution for food packaging applications requiring both thermal resistance and gas barrier properties.

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Biaxially stretched polylactic acid film with enhanced toughness and improved mechanical properties through a novel polymerization process. The film comprises a three-layer structure with a specific composition of polylactic acid, polylactic acid block copolymer, and functional masterbatch. The process involves a controlled reaction between alkylated epoxy cardanol, hexachloroplatinic acid, phenyltriethoxysilane, and glycidyl methacrylate to form a silicon-containing epoxidized cardanol-glycidyl methacrylate polymer. This polymer is then extruded and stretched to form the film. The resulting film exhibits superior toughness and mechanical properties compared to conventional polylactic acid films, making it suitable for packaging applications where impact resistance is critical.

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Polylactic acid composite material composition that enhances heat resistance and mechanical properties through a specific mixing ratio of L-type and D-type polylactic acid resins with talc, PBAT, and DPG benzoate. The composition, comprising 55-65% L-type PLA, 6-14% D-type PLA, 21-25% talc, 5-15% PBAT, and 3-5% DPG benzoate, provides improved thermal stability and mechanical performance while maintaining processing characteristics.

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Heat-resistant polylactic acid composite material with improved thermal properties for applications like food packaging. The composite contains polylactic acid (PLA), halloysite nanotubes as a nucleating agent, coconut fiber grafted with maleic acid as a reinforcing agent and compatibilizer, and triethylamine and N-(2-aminoethyl)-3-aminopropyl triethoxysilane as modifiers. The composite is prepared by melt blending. The halloysite nanotubes, coconut fiber, and modifiers enhance the crystallization and mechanical properties of the PLA composite to achieve higher heat distortion temperatures.

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A high-temperature resistant biodegradable composite material for food packaging applications. The material is prepared by combining polylactic acid (PLA) with modified chitosan, which is produced through a multi-step process involving carboxymethylation, cationization, and sulfonation of chitosan. The modified ch

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A multilayer biodegradable film comprising a central layer of polybutylene adipate-co-butylene terephthalate (PBAT), a middle layer of polypropylene (PP), and a surface layer of polyethylene (PE) with enhanced barrier properties. The film combines the mechanical strength and barrier properties of PBAT and PP with the biodegradability of PE, achieving a multilayer structure that maintains high mechanical integrity while maintaining biodegradability.

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Epoxy cardanol-based chain extender modified PBAT-PLA composite film with improved mechanical properties and biodegradability compared to traditional chain extenders. The cardanol-based epoxy chain extender, like ECGE, reacts with the hydroxyl and carboxyl groups of PBAT and PLA during melt blending to form in-situ graft and/or block copolymers that improve interface adhesion and compatibility. This reduces voids and defects in the composite film, resulting in enhanced mechanical strength. The cardanol-based chain extender also has lower molecular weight than traditional chain extenders like ADR 4468, which allows better diffusion into the polymer phases and more reaction sites for chain extension. The epoxy cardanol chain extender enables better mechanical performance and biodegradability compared to traditional chain extenders.

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Transparent high-toughness biaxially oriented polylactic acid (PLA) film with improved strength and impact resistance. The film is made by blending PLA masterbatch, polycaprolactone, a toughening agent (modified nano-silica), and a heat stabilizer. The PLA masterbatch provides the base polymer, polycaprolactone adds toughness, the modified nano-silica toughening agent improves strength and prevents cracking, and the heat stabilizer prevents thermal degradation during processing. The blended resin is biaxially stretched to orient the fibrous structure for enhanced mechanical properties.

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Bio-based polymer material with temperature resistance for applications like packaging and fiber production. The material is made by blending specific amounts of starch, polylactic acid, stabilizers, catalysts, binder, and plant fiber. The blending ratios are optimized to achieve temperature resistance. The material can be prepared by extrusion processing the blended components. The bio-based temperature resistant polymer offers an alternative to fossil fuel-based materials.

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A processing method for degradable packaging films that enhances their mechanical properties without compromising their biodegradability. The method involves combining a polylactic acid (PLA) film with a thiolated cage-type polysiloxane (PSiO2) and a specific type of vinyl compound. The PSiO2 is incorporated into the PLA film through a controlled melt processing step, followed by a series of mechanical processing steps including extrusion, casting, and stretching. The vinyl compound is added to enhance film properties, while the PSiO2 serves as a toughening agent that improves the film's mechanical strength. The stretching process introduces molecular orientation, while the UV light treatment initiates cross-linking reactions that further enhance the film's durability. The resulting film exhibits improved mechanical properties compared to conventional PLA films while maintaining its biodegradability.

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A composite material comprising polylactic acid (PLA) and polybutylene terephthalate (PBAT) that combines enhanced thermal and impact resistance with improved mechanical properties. The composite is prepared through a specialized compatibilization process that involves grafting maleic anhydride onto PLA/PBAT, followed by the addition of nano-calcium carbonate particles. This modification enables uniform dispersion of the calcium carbonate in the polymer matrix, significantly improving its thermal stability and mechanical performance compared to conventional PBAT/PLA blends.

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Heat-resistant modified starch packaging material with improved heat resistance and mechanical properties compared to traditional starch-based packaging. The modification involves esterifying starch with a compound called octaphenyl-POSS containing carboxyl groups and catechins. The esterification grafts the octaphenyl-POSS onto the starch chains, increasing rigidity to limit molecular movement and improve heat resistance. The octaphenyl-POSS also forms connections between starch chains, further increasing crosslinking. The catechins provide antioxidant benefits. The modified starch is then processed into packaging films.

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Toughened biaxially oriented polylactic acid (PLA) film with enhanced mechanical properties through controlled stereocomplex formation. The film is prepared by sequentially depositing a surface layer, a core layer, and a second surface layer, followed by a stereocomplex resin layer. The stereocomplex resin, comprising PLLA-PCL and PDLA-PCL copolymers, is formed through controlled crystallization conditions to achieve uniform crystal distribution. This approach enables the formation of stereocomplex crystals while maintaining the film's mechanical integrity, resulting in improved toughness and thermal stability.

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A process for making biodegradable food packaging bags that can be used at high temperatures without releasing toxic substances. The process involves mixing biodegradable materials like potato starch and corn starch with polyethylene resin to create a composite that can be used for the packaging bags. This composite is then processed into the bags. The use of biodegradable materials improves safety by eliminating toxic releases at high temperatures, unlike conventional plastic bags.

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Polylactic acid (PLA) material with enhanced heat resistance and flexibility through a novel modification approach. The material is prepared through a process that combines conventional PLA polymerization with a specific chemical modification step. This modification introduces a novel chemical structure that simultaneously improves the thermal stability and mechanical properties of PLA while maintaining its biodegradability. The modified PLA exhibits superior thermal resistance and flexibility compared to conventional PLA, enabling applications in high-temperature and high-stress environments.

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A fully degradable food packaging film material and preparation process that combines the mechanical properties of polylactic acid (PLA) with the biodegradability of natural materials. The film achieves superior performance characteristics through a novel combination of PLA's inherent mechanical properties with the enhanced toughness and thermal stability of natural polymers like starch or cellulose. The film's unique blend of PLA and natural polymers enables a material that is both fully biodegradable and retains excellent mechanical properties, making it suitable for food packaging applications where both performance and environmental sustainability are critical.

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Polylactic acid (PLA) composite material for food packaging applications, comprising a combination of PLA and maleic acid grafted polyimide, that exhibits enhanced mechanical properties and thermal stability compared to conventional PLA. The material combines the biodegradable and renewable properties of PLA with the improved mechanical performance and thermal resistance of maleic acid grafted polyimide. This composite material is suitable for food packaging applications where both mechanical strength and thermal stability are required.

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A method for preparing a fully degradable, heat-shrinkable film comprising a micro-nano active system. The method involves preparing a polylactic acid-based film through conventional extrusion, followed by the incorporation of micro-nano active agents into the film matrix. The active agents are specifically engineered to release their functional properties in controlled, controlled-release patterns, while maintaining the film's mechanical properties and transparency. This integrated approach enables the creation of a fully degradable, heat-shrinkable film that combines the benefits of active packaging with the sustainability of a biodegradable material.

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Biodegradable cling film made from a blend of PBAT, modified starch, polylactic acid, biodegradable copolyester, methyl hydroxypropyl cellulose ether, nano talc, chain extender, antioxidant, and lubricant. The film has improved properties like strength, flexibility, and heat resistance compared to prior art blends. The key differences are using modified starch with a specific process to enhance compatibility, along with specific ratios of components like methyl hydroxypropyl cellulose ether to improve interfacial adhesion.

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Polylactic acid (PLA) composite material with enhanced mechanical properties and improved thermal stability through a novel toughening approach. The material combines maleic anhydride graft modification (MAM) with polybutylene adipate terephthalate (PBAT) to achieve a balance between strength and toughness. The grafting process enables the incorporation of maleic anhydride into PLA without compromising its processing characteristics, while PBAT enhances thermal stability. This combination provides improved mechanical performance, thermal resistance, and degradation characteristics compared to conventional PLA toughening methods.

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A biodegradable PLA heat shrinkable film that achieves enhanced thermal stability through the strategic incorporation of polyethylene oxide (PEO) as a heat shrinkage modifier. The film combines PLA with a specific molecular weight PEO (2:1 ratio), which significantly increases its thermal resistance and dimensional stability. The PEO modifier enhances the film's thermal expansion properties, allowing it to maintain its shape during heat treatment. The resulting film exhibits superior thermal performance compared to conventional petroleum-based heat shrinkable films, with improved heat shrinkage rates and forces.

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Polymeric compositions for biodegradable and renewable materials that combine heat resistance and biodegradability. The compositions contain a low proportion of renewable raw materials, specifically poly(lactic acid) (PLA), polyester, and fillers, with a water content of less than 0.1% by weight. The compositions exhibit superior thermal stability and biodegradability compared to conventional biodegradable plastics, making them suitable for applications requiring both thermal resistance and biodegradability.

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Biodegradable plastic comprising polybutylene butyrate, polylactic acid, and polycaprolactone, with enhanced properties through the addition of modified starch, binder, stabilizer, carbon fiber, asbestos fiber, graphite powder, plasticizer, and mica powder. The composition combines these materials to improve mechanical strength, electrical insulation, thermal resistance, and wear resistance while maintaining biodegradability under natural conditions.

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Polylactic acid/bamboo powder/starch composite material and method for improving its mechanical properties through the addition of natural fibers. The composite material comprises a polylactic acid matrix with bamboo powder and starch reinforcement, where the bamboo powder enhances mechanical strength while the starch improves biodegradability. The material is prepared through a novel polyurethane elastomer modification process that incorporates the dextran-polylactic acid-based polyurethane component, enabling enhanced toughness and heat resistance.

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Polylactic acid/starch composite material and preparation method that enables the production of biodegradable plastics with improved mechanical properties through controlled starch incorporation. The composite material combines polylactic acid (PLA) with starch, where the starch enhances the crystallization of PLA, increases its modulus, and improves its impact resistance. The starch is incorporated in a controlled manner to prevent brittleness and maintain the PLA's biodegradability. This approach enables the production of biodegradable plastics with enhanced mechanical performance while maintaining their biodegradability.

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Polylactic acid/cellulose biodegradable composite material and preparation method that combines the mechanical properties of cellulose with the toughness of polyurethane elastomers. The composite is prepared through a modified polyurethane elastomer formulation that incorporates maleic anhydride grafted polylactic acid (PLA) segments. The PLA segments form nano-rubber phases within the elastomer matrix, providing enhanced toughness without compromising modulus. The PLA matrix also serves as a nucleating agent for crystallization, enabling controlled crystallization and improved mechanical properties. The composite exhibits improved toughness, heat resistance, and biodegradability compared to conventional cellulose-based composites.

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Polylactic acid composite material for tableware that addresses the limitations of traditional polylactic acid formulations. The material combines polylactic acid with additional components such as antibacterial agents, UV absorbers, hydrolysis-resistant agents, and colorants to enhance its performance in tableware applications. This composite material combines the benefits of polylactic acid with improved durability, heat resistance, and antimicrobial properties, making it suitable for tableware that requires both functional and aesthetic properties.

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A method for preparing a biodegradable polyurethane elastomer through stereocomplex crystallization of a polylactic acid-poly(caprolactone) copolymer. The copolymer is synthesized through a controlled reaction of aliphatic diisocyanate with polylactic acid and polycaprolactone, followed by crystallization through controlled cooling and quenching. The crystallization process enables the formation of a stereocomplex structure in the copolymer, which enhances its mechanical properties while maintaining biodegradability.

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A highly flexible and heat-resistant polylactic acid-modified material and a process for its preparation, comprising a polylactic acid (PLA) masterbatch containing 50-99 parts of homopolymer, 1-50 parts of copolymer, 1-5 parts of chain extender, 1-10 parts of heat stabilizer, 5-20 parts of heat-resistant modifier, 1-10 parts of toughening agent, and 15 parts of nucleating agent. The masterbatch is prepared by mixing the PLA components in a specific ratio, followed by extrusion through a single screw process to produce the modified material.

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Highly flexible and heat-resistant polylactic acid (PLA) modified material and process for producing the same, comprising a PLA homopolymer 50-99 parts, a PLA copolymer 1-50 parts, a chain extender 1-5 parts, a heat stabilizer 1-10 parts, a heat resistance modifier 5-20 parts, a toughening agent 1-10 parts, and a nucleating agent 1-15 parts.

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High strength and heat-resistant polylactic acid composite material comprising a combination of polylactic acid (PLA) and poly(lactic-co-glycolic acid) (PLGA) with improved thermal stability. The material combines the inherent mechanical properties of PLA with the enhanced thermal resistance of PLGA, achieving a balance between strength and thermal resistance. The composite is prepared through a controlled mixing process that incorporates specific additives and nucleating agents to optimize the material's properties.

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A polylactide-type polyurethane-modified polylactic acid alloy that combines enhanced toughness and heat resistance through controlled polyurethane modification of polylactic acid. The alloy comprises a polylactic acid matrix with a D-polylactide polyol interpolymer as the elastomeric component. The D-polylactide polyol is a difunctional polyol with specific molecular weight and hydroxyl value ranges, and the elastomeric component is a polyurethane elastomer with a specific molecular weight and composition ratio. The D-polylactide polyol is added to the polylactic acid matrix in a controlled manner, allowing the elastomeric component to be dispersed within the matrix while maintaining the desired mechanical properties.

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A process for preparing toughened polybutylene succinate with long-lasting stability. The process involves melt blending polybutylene succinate with a specific polyester elastomer at a temperature range of 120-160 °C. The elastomer is present in a concentration between 5-20 wt% and is formulated to improve the elastomer's molecular weight and dispersibility. The blend is then subjected to a controlled polycondensation reaction at 210-230 °C to form a toughened polybutylene succinate with enhanced mechanical properties.

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A modified polylactic acid composite material that enhances its thermal stability, mechanical strength, and dimensional stability through the use of glass fibers with diameters less than 5 μm. The material combines a high-performance glass fiber with a modified polylactic acid resin, which improves the fiber-reinforced composite's overall performance characteristics while maintaining its inherent advantages. The glass fibers achieve improved dispersion and distribution through a controlled extrusion process, while the modified polylactic acid resin incorporates a blend of antioxidants to enhance its degradation resistance. The composite material exhibits superior thermal stability, mechanical strength, and dimensional stability compared to conventional polylactic acid composites, making it suitable for high-performance applications.

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A method for producing ultra-tough, thermally conductive polylactic acid (PLA) composites with enhanced mechanical properties and thermal conductivity. The method involves melt-mixing PLA with carbon nanotubes and a polymer elastomer containing D-lactic acid segments, followed by melt-blending the premix with the elastomer. The process specifically introduces a stereocomplex crystal structure between the PLA matrix and elastomer, which acts as a capture agent for the carbon nanotubes. This stereocomplex crystal structure stabilizes the carbon nanotubes at the interface of the blend phase, enabling improved mechanical properties and thermal conductivity without the need for surface modification. The resulting composite material exhibits enhanced toughness, thermal conductivity, and electrical conductivity compared to conventional PLA composites.

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A cost-effective method for producing heat-resistant polylactic acid (PLA) suitable for food contact applications. The method involves synthesizing oligomers of D-lactic acid through direct condensation oligomerization, followed by melt blending with industrial-grade PLA to create a heat-resistant PLA material. The oligomers have molecular weights ranging from 2500 to 20,000, enabling the production of a cost-effective heat-resistant PLA material for food contact applications.

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A polylactic acid-based composite material that enhances its mechanical properties and thermal performance through a synergistic blend of polylactic acid (PLA), a biodegradable thermoplastic, with aromatic copolyester (AEP) and a compatibilizer. The formulation combines 65% PLA with 20% AEP, 3% compatibilizer, and 8% modified inorganic fillers, resulting in a material with improved toughness and impact resistance compared to PLA alone. The material exhibits enhanced mechanical performance and thermal stability, making it suitable for injection molding, blow molding, and other plastic processing applications.

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Modified polylactic acid fiber with enhanced mechanical properties through the incorporation of polydextrose acid block copolymer and antioxidant components. The fiber combines the biodegradable and biocompatible properties of polylactic acid with the improved thermal stability and toughness of polydextrose acid block copolymer, achieved through the formation of stereocomplex crystals. The incorporation of antioxidant components further enhances the fiber's dimensional stability and resistance to heat and moisture.

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Biodegradable blown film resin for sustainable packaging applications that has improved mechanical properties and reduced cost compared to existing biodegradable plastics. The resin is made by blending vegetable starch, polyester, and ethanolamine-activated montmorillonite clay. The clay improves the blend's tensile strength, tear resistance, and elongation. The ethanolamine treatment modifies the clay's surface chemistry to enhance compatibility with the other components. The resin can be processed into biodegradable blown films using conventional equipment.

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High-toughness polylactic acid-based materials with enhanced mechanical properties prepared through reactive extrusion with polyhedral oligomeric silsesquioxane (POSS) nanoparticles. The process involves direct introduction of the reactive POSS into the polylactic acid (PLA) matrix during extrusion, where the POSS nanoparticles act as crystallization nuclei to enhance PLA crystallinity and promote interfacial bonding. This results in PLA composites exhibiting improved mechanical strength and toughness while maintaining biodegradability.

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A high-temperature packaging material that does not release harmful substances when exposed to high temperatures. The material comprises a blend of biodegradable polymers such as PLA, PVA, and PBAT, along with natural biopolymers like hemicellulose, chitin, and wood fibers. The blend is formulated with a specific ratio of biodegradable polymers (26-60%) and natural biopolymers (18-40%), along with a controlled amount of water (8-12%) and additives (16%). This composition enables the material to maintain its structural integrity at high temperatures while ensuring complete biodegradability.

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A food-grade biodegradable polylactic acid (PLA) composite material for high-temperature applications. The material combines a high molecular weight PLA with a lower molecular weight D-lactic acid (DPLA) to achieve improved thermal stability while maintaining biodegradability. The composition includes functional additives that enhance the material's performance in injection molding and extrusion applications. The antioxidants and light absorbers used in the formulation ensure the material meets food-grade standards while maintaining its biodegradability.

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Super-tough polylactic acid elastomer blends and products for high-temperature applications. The blends achieve superior thermal resistance through a specific combination of polylactic acid (PLA) and elastomer components, where the PLA component is modified to enhance its crystallization rate and toughness. The blends are prepared through a novel processing method that combines conventional melt processing with specific conditions to create a material with enhanced thermal stability and impact resistance.

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A toughened polylactic acid (PLA) preparation method that enables enhanced mechanical properties through the combination of biodegradable PLA and a novel polyurethane elastomer. The method involves blending the biodegradable PLA with a specific polyurethane elastomer, which is produced through a controlled esterification reaction between lactic acid and isocyanates. The resulting blend exhibits improved toughness and impact resistance compared to conventional PLA formulations, while maintaining excellent mechanical properties and biodegradability.

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High-strength transparent polylactic acid (PLA) film with enhanced toughness, achieved through a novel copolymerization process. The film is prepared by combining polylactic acid with specific monomers in a controlled reaction sequence, followed by a network formation step where the monomers react with the PLA backbone. This results in a material with improved mechanical properties, including enhanced toughness and transparency, through the formation of a cross-linked network structure. The process enables the production of high-performance PLA films with improved mechanical properties compared to conventional materials.

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