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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A biodegradable composite material combining the benefits of polylactic acid (PLA) and polybutylene adipate-co-butylene terephthalate (PBAT) for enhanced mechanical properties. The material combines the biodegradability of PLA with the impact resistance of PBAT, achieving superior performance in applications requiring both durability and biodegradability. The composite material can be formulated into various shapes, including straws, tissue covers, and packaging components, offering improved tear resistance and impact strength compared to conventional PLA-based materials.

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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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High-strength biaxially stretched polylactic acid film with improved mechanical properties. The film comprises an upper surface layer, a core layer, and a lower layer. The core layer contains a toughening agent and polylactic acid slices, with the toughening agent accounting for 3-5% of the total mass. The toughening agent is a spherical silica particle modified by a silane coupling agent containing phenyltriethoxysilane and γ-(2,3-glyoxypropoxy)propyltrimethoxysilane.

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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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