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首页> 外文期刊>Journal of Applied Polymer Science >Improving the toughening in poly(lactic acid)-thermoplastic cassava starch reactive blends
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Improving the toughening in poly(lactic acid)-thermoplastic cassava starch reactive blends

机译：改善聚（乳酸） - 热塑性木薯淀粉反应性共混物的增韧

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摘要

Poly(lactic acid) (PLA), a physical blend of PLA and thermoplastic cassava starch (TPCS) (PLA-TPCS), and reactive blends of PLA with TPCS using maleic anhydride as compatibilizer with two different peroxide initiators [i.e., 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane (L101) and dicumyl peroxide (DCP)] PLA-g-TPCS-L101 and PLA-g-TPCS-DCP were produced and characterized. Blends were produced using either a mixer unit or twin-screw extruder. Films for testing were produced by compression molding and cast film extrusion. Morphological, mechanical, thermomechanical, thermal, and optical properties of the samples were assessed. Blends produced with the twin-screw extruder resulted in a better grade of mixing than blends produced with the mixer. Reactive compatibilization improved the interfacial adhesion of PLA and TPCS. Scanning electron microscopy images of the physical blend showed larger TPCS domains in the PLA matrix due to poor compatibilization. However, reactive blends revealed smaller TPCS domains and better interfacial adhesion of TPCS to the PLA matrix when DCP was used as initiator. Reactive blends exhibited high values for elongation at break without an improvement in tensile strength. PLA-g-TPCS-DCP provides promising properties as a tougher biodegradable film. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46140.
机译：聚（乳酸）（PLA），PLA和热塑性木薯淀粉（TPC）（PLA-TPCs）的物理混合物，以及使用马来酸酐作为具有两种不同过氧化物引发剂的MOLIC酸酐的TPC的PLA反应性共混物[即2,5 - 双（叔丁基过氧）-2,5-二甲基己烷（L101）和过氧化二异丙苯（DCP）] PLA-G-TPCS-L101和PLA-G-TPCS-DCP被生产和表征。使用混合器单元或双螺杆挤出机生产混合物。通过压缩成型和浇铸膜挤出产生用于测试的薄膜。评估样品的形态学，机械，热机械，热和光学性质。用双螺杆挤出机产生的混合物导致更好的混合等级，而不是用混合器制备的共混物。反应性相容改善了PLA和TPC的界面粘附。由于相容性差，物理混合物的扫描电子显微镜图像显示PLA矩阵中的较大TPC结构域。然而，当DCP用作引发剂时，反应性共混物揭示了较小的TPCS结构域和TPC对PLA基质的更好的界面粘附。反应性共混物在断裂时显示出高值，而不会改善拉伸强度。 PLA-G-TPCS-DCP提供有希望的属性作为更强硬的可生物降解膜。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,46140。

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