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首页> 外文期刊>Journal of Applied Polymer Science >Compatibility improvement of poly(lactic acid)/thermoplastic starch blown films using acetylated starch
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Compatibility improvement of poly(lactic acid)/thermoplastic starch blown films using acetylated starch

机译：使用乙酰化淀粉的聚（乳酸）/热塑性淀粉吹膜的相容性改进

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摘要

The present research aims to improve the compatibility between relatively hydrophobic poly(lactic acid) (PLA) and hydrophilic thermoplastic starch (TPS) and the properties of the PLA/TPS blends by replacing TPS from native cassava starch (TPSN) with TPS from acetylated starch (TPSA). The effects of the degree of acetylation (DA) of acetylated starch, that is, 0.021, 0.031, and 0.074, on the morphological characteristics and properties of PLA/TPS blend are investigated. The melt blends of PLA and TPS with a weight proportion of PLA:TPS of 50:50 are fabricated and then blown into films. Scanning electron microscopy confirms the dispersion of TPS phase in the PLA matrix. Better dispersion and smaller size of the TPS phase are observed for the PLA/TPSA blend films with low DA of acetylated starch, resulting in improved tensile and barrier properties and increased storage modulus, thermal stability, andT(g),T-cc, andT(m)of PLA. Elongation at break of the PLA/TPSA blend increases up to 57%, whereas its water vapor permeability and oxygen permeability decrease about 15%. The obtained PLA/TPSA blend films have the potential to be applied as biodegradable flexible packaging.
机译：本研究旨在通过将天然木薯淀粉（TPSN）中的TPS替换为乙酰化淀粉（TPSA）中的TPS，改善相对疏水性聚乳酸（PLA）和亲水性热塑性淀粉（TPS）之间的相容性以及PLA/TPS共混物的性能。研究了乙酰化淀粉的乙酰化度（DA）即0.021、0.031和0.074对PLA/TPS共混物形态特征和性能的影响。制备了PLA和TPS重量比为50:50的熔融共混物，然后吹塑成膜。扫描电子显微镜证实TPS相在PLA基质中分散。对于乙酰化淀粉的DA较低的PLA/TPSA共混膜，可以观察到更好的分散性和更小的TPS相尺寸，从而改善拉伸和阻隔性能，增加PLA的储能模量、热稳定性和T（g）、T-cc和T（m）。PLA/TPSA共混物的断裂伸长率提高了57%，而其水蒸气渗透性和氧渗透性降低了约15%。所得PLA/TPSA共混膜具有作为可生物降解软包装的潜力。

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