Thermal Resistant Polylactic Acid Packaging

A biodegradable packaging material with improved durability and barrier properties, comprising a paper substrate coated with a composition of polyhydroxyalkanoate (PHA) and two or more types of polylactic acid (PLA) with different melting indices. The PHA provides thermal stability and the PLA enhances barrier properties, while the combination of both enables the material to meet both industrial and household composting standards.

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Biaxially stretched film comprising polylactic acid with a tear strength of 50-100 N/mm, enabling both punching processability and heat resistance. The film is suitable for applications such as protective films for electronic devices, where it provides a balance of mechanical strength, thermal stability, and ease of processing.

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Recyclable packaging film with improved properties like heat resistance and durability compared to all-polyethylene films, while still allowing recycling. The film has an oriented base layer with a polar polymer layer and a stabilizing polyolefin layer. The stabilizing polyolefin improves dimensional stability during converting processes. The polar polymer layer provides heat resistance and appearance. The stabilizing polyolefin allows recycling compatibility. The base film has a converting strain of 0-0.75% at 75°C.

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Degradable plastic bottle for pesticide applications that can store pesticides for long periods without degradation issues. The bottle is made by blowing molding a composite resin mixture containing specific degradable polymers. The mixture includes polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), polymethyl ethylene carbonate (PEC), polyglycolic acid (PGA), and calcium carbonate (CaCO3). The composite resin mixture allows improved mechanical properties, crystallinity, and barrier performance compared to using PLA alone. The bottle can degrade in composting conditions and has controlled degradation properties.

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A resin composition comprising a polylactic acid polymer and a β-methyl-δ-valerolactone polymer, which improves the tensile elongation at break of polylactic acid while suppressing a decrease in glass transition temperature.

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Biodegradable container made from a biodegradable resin composition that uses a specific type of biodegradable polymer called polyhydroxyalkanoate (PHA) with a high content of 4-hydroxybutyrate (4-HB) units. The composition has a melt flow index of 1.0 g/10 minutes or more when measured at 165°C. The container made from this composition has improved properties like impact resistance, chemical resistance, and water resistance compared to other biodegradable containers. It also has a compressive strength of 5 kgf/cm2 or more. The biodegradable container can be prepared by molding the biodegradable resin composition.

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Laminated article with improved oil resistance and crack resistance for packaging materials and containers made from biodegradable materials. The laminated article has a substrate layer like paper and a sealant layer containing a biodegradable polyhydroxyalkanoate (PHA) resin. The PHA resin has specific melting behavior: a highest melting peak at 130°C or higher and total crystalline melting enthalpy from 20 to 65 J/g. This PHA resin composition provides both good oil resistance and crack resistance in the sealant layer. The laminated article can be formed by extrusion lamination or thermal lamination processes.

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A biodegradable resin with enhanced flexibility, comprising a poly(lactic acid-b-3-hydroxypropionic acid) block co-polymer with a crystalline layer thickness of 1.0 nm to 14.0 nm, a molecular weight of 50,000 g/mol to 500,000 g/mol, and a composition of 10% to 30% poly(3-hydroxypropionic acid) and 70% to 90% polylactic acid. The resin exhibits a Young's modulus of 0.1 GPa to 5.0 GPa and can be used in various molded articles, including packaging materials.

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Biodegradable resin composition comprising a blend of polylactic acid (PLA) and polyhydroxyalkanoate (PHA) resins, wherein the PHA resin comprises a combination of 3-hydroxyhexanoate (3HH) and 4-hydroxybutyrate (4HB) repeating units, enabling the production of biodegradable films with improved mechanical properties, stretchability, and biodegradability.

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A biodegradable foam sheet for food containers that combines high thermal resistance, insulation, and anti-staining properties. The foam sheet is made from a polylactic acid (PLA) composition with a crystallinity of 40-60% and a melt viscosity of 100-500 Pa·s. The PLA composition contains a chain extender with two or more epoxy groups per molecule and has a bulk density of 0.063-0.250 g/cm3. The foam sheet is produced using a high-temperature extrusion process and has a surface roughness of 0.5-2.0 μm.

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This research paper aims to enhance the fatigue resistance of polylactic acid (PLA) in Material Extrusion (ME) by incorporating natural reinforcement, focusing on rotational bending fatigue. The study investigates the fatigue behavior of PLA in ME, using various natural fibers such as cellulose, coffee, and flax as potential reinforcements. It explores the optimization of printing parameters to address challenges like warping and shrinkage, which can affect dimensional accuracy and fatigue performance, particularly under the rotational bending conditions analyzed. Cellulose emerges as the most promising natural fiber reinforcement for PLA in ME, exhibiting superior resistance to warping and shrinkage. It also demonstrates minimal geometrical deviations, enabling the production of components with tighter dimensional tolerances. Additionally, the study highlights the significant influence of natural fiber reinforcement on the dimensional deviations and rotational fatigue behavior of printed components. The fatigue resistance of PLA was significantly improved with natural fiber reinforc... Read More

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A biodegradable plastic composition with improved processability and mechanical properties, comprising a blend of polylactic acid (PLA) and suberin or suberin-based compounds extracted from plant sources, such as cork and potato periderm. The composition exhibits enhanced plasticity and biodegradability compared to conventional PLA-based bioplastics, making it suitable for various applications including disposable products, packaging, and agricultural materials.

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Polylactic acid (PLA) is a biodegradable thermoplastic made from lactic acid monomers obtained through fermented glucose in crops like wheat and corn. PLA has numerous applications, including industrial packaging, biomedical equipment, and membranes, due to its low toxicity, biodegradability, and recycling potential. However, little is known about the short-term aging effects of particulate reinforced PLA composites in complex environments. This study investigates the chemical endurance of various PLA composites before and after exposure to different chemicals and hygrothermal conditions. The results reveal that the fabrication processing method greatly affects the degradation rate. The PLA/Carbon Fiber Powder (CFP) samples had the highest chemical resistance towards degradation in 1% HNO followed by 2% NaOH with a maximum mass increase of 2.8% and 3.9% respectively. The PLA/CFP samples showed lowest chemical resistance under a combination of water and aging temperature, with an average maximum weight gain of 9.64% throughout the three CFP loadings. Continuous test for 15wt% CFP sam... Read More

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Hydrolysis-stabilized polyester compositions comprising a monomeric carbodiimide of formula (I) with improved hydrolysis protection in PET and PLA, particularly for high-temperature processing applications. The carbodiimide stabilizer is characterized by a specific molecular structure and NCN content, enabling effective moisture binding and long-term stability in polyester materials.

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To enrich the properties of polylactic acid (PLA)-based composite films and improve the base degradability, in this study, a certain amount of poly(propylene carbonate) (PPC) was added to PLA-based composite films, and PLA/PPC-based composite films were prepared by melt blending and hot-press molding. The effects of the introduction of PPC on the composite films were analyzed through in-depth studies on mechanical properties, water vapor and oxygen transmission rates, thermal analysis, compost degradability, and bacterial inhibition properties of the composite films. When the introduction ratio coefficient of PPC was 30%, the tensile strength of the composite film increased by 19.68%, the water vapor transmission coefficient decreased by 14.43%, and the oxygen transmission coefficient decreased by 18.31% compared to that of the composite film without PPC, the cold crystallization temperature of the composite film increased gradually from 96.9 C to 104.8 C, and PPC improved the crystallization ability of composite film. The degradation rate of the composite film with PPC increased s... Read More

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A biodegradable resin composition for extrusion coating that exhibits excellent mechanical properties, including thermal bonding strength and processability, even at low temperatures. The composition comprises 5-95% by weight of polyhydroxyalkanoate (PHA) resin, with a melt flow index of 5-60 g/10 min and a weight average molecular weight of 30,000-1,200,000 g/mol. The PHA resin contains 0.1-50% by weight of 4-hydroxybutanoate (4-HB) repeating units, which enables the composition to maintain its mechanical properties during processing at temperatures below 260°C.

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A biodegradable triblock copolymer of polybutylene succinate (PBS) and polylactic acid (PLA) that enhances the mechanical and barrier properties of PBS-based bioplastics. The copolymer, PLLA-b-PBS-b-PLLA, is synthesized through a cost-effective and reproducible method using a PBS macroinitiator. The copolymer is characterized by a PBS block with a molecular weight of 1500-40,000 g/mol and a PLLA block with a molecular weight of 4000-200,000 g/mol. The copolymer is used as an additive in PBS-based bioplastics to improve their mechanical strength, thermal stability, and barrier properties against gases and water vapor.

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Biodegradable packaging materials that can be used for food preparation and storage. The materials consist of a continuous polylactic acid matrix with discrete polycaprolactone domains. The polycaprolactone domains can be present as separate components within the polylactic acid matrix, providing a controlled release of the material's biodegradability properties. This composition enables the creation of biodegradable packaging that can be used both as containers for food preparation and as containers for food storage.

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A biodegradable foamed sheet comprising a polylactic acid (PLA) and a filler, wherein the sheet exhibits a compressive stress of 0.2 MPa or less when the cushioning coefficient is 10 or less, and a puncture strength of 2 N or more when the sheet thickness is 2 mm. The PLA is foamed using a kneading process that employs a compressible fluid to achieve uniform dispersion of the filler, resulting in a sheet with enhanced cushioning and strength properties.

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This study examines the tribological characteristics of polymer-composites produced by fused deposition modeling (FDM), with a particular emphasis on composite materials where polylactic acid (PLA) is used as matrix material and Al metal powder is used as a reinforced material. The study's objectives are to compare the wear resistance capacities of PLA and PLA-Al-based composite materials prepared by three dimensional (3D) printing process. The samples were manufactured by the FDM-based manufacturing process. It has revealed that the PLA-Al composite had significantly better wear resistance than PLA. The PLA-Al sample has exhibited the lowest wear rate (501 m), whereas the PLA sample has exhibited a comparatively higher wear rate of (1,188 m). These findings have major implications for the automobile sector, oil and gas industry, and marine applications that require materials with excellent wear resistance.

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