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Evaluation of Fully Biodegradable PLA/PHB Blend Filled with Microcrystalline Celluloses
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Researchers developed biodegradable biocomposites from PLA/PHB polymer blends reinforced with microcrystalline cellulose, finding that adding up to 4 wt% cellulose improved material properties, while higher loadings at 7 wt% reduced crystallinity and thermal stability due to filler aggregation.
In this work, biodegradable biocomposites were developed using PLA/PHB blend as matrix and two types of microcrystalline cellulose as filler at three different contents. The biocomposites were evaluated regarding their thermal and morphological characteristics and molecular dynamic behavior. It was seen that cellulose addition did not promote significant changes in the Tm, Tc and Tcc in the matrix. On the other hand, XRD and TGA revealed that the addition of the highest content (7 wt%) of cellulose fillers resulted in a more significant decrease in crystallinity and thermal stability of the PLA/PHB matrix, suggesting a formation of filler aggregates. This indication was confirmed by TD-NMR, whose results pointed to a greater heterogeneity molecular in the samples containing higher cellulose contents. Therefore, this technique proved to be a relevant and complementary tool for the characterization of composites materials, contributing to determinate the most appropriate filler content introduced in a polymer matrix.
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Biodegradable polylactic acid/polyhydroxybutyrate-co-hydroxyvalerate blend composites with microcrystalline cellulose – mechanical, rheological and thermal investigation
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Researchers developed and characterized biodegradable polymer composites by blending polylactic acid and polyhydroxybutyrate-co-hydroxyvalerate with microcrystalline cellulose at 5, 10, and 15 wt%. The cellulose filler strengthened the composites and improved resistance to aging, though loadings above 10 wt% reduced mechanical properties, demonstrating the potential of these fully biodegradable materials as environmentally friendly alternatives to conventional plastics.
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Researchers prepared polylactic acid composites with three different cellulose-based fillers and studied how they age under UV light exposure. The study found that the type of cellulose additive plays a crucial role in how well the material resists UV degradation, with some forms improving both mechanical properties and degradation timing. These findings support the potential of biodegradable polymer composites as alternatives to conventional plastics that generate persistent microplastic waste.
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This study investigated how crystallization processes affect the hardness of composites made from cellulose nanofibers and polylactic acid, a biodegradable plastic, with implications for replacing conventional fossil-fuel-based plastics.
Enhancing the Mechanical Properties of Inherently Brittle, Biobased and Biodegradable Polyhydroxybutyrate (PHB) Polymer by Cotton Fibre Reinforcement and Interfacial Grafting
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