Synthesis of branched poly(lactide) using polyglycidol and thermal, mechanical properties of its solution-cast film
Synthesis of branched poly(lactide) using polyglycidol and thermal, mechanical properties of its solution-cast film
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DOI：
10.1016/j.polymer.2005.11.039
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发表时间：
2006-01-01
期刊：
影响因子：
4.6
通讯作者：
Ohya, Y
中科院分区：
文献类型：
--
作者：
Ouchi, T;Ichimura, S;Ohya, Y
以S或D-丙交酯为原料，通过本体开环聚合合成了具有不同接枝链长度的支化聚丙交酯L。使用聚缩水甘油作为宏观缓蚀剂。通过热分析和拉伸测试，研究了支化聚乳酸或聚乳酸及其立体复合体的聚合物膜的性能。支化的PLLA或PDLA薄膜具有较低的玻璃化转变温度(T-m)和熔融温度(T-m)。结晶度、杨氏模数和断裂应变高于相应的线型PLLA或PDLA薄膜。支化PLLA/支化PDLA立体复合膜表现出较高的最大应力和较高的杨氏模数，保持了较高的断裂应变。此外，将支化的PLLA或PDLA作为线型PLLA的增塑剂，分别与1：9共混膜或由支化的PDLA与线型PLLA制备的立体复合膜，考察了支化的PLLA或PDLA作为线型PLLA的增塑剂的作用。共混或线型PLLA/支化PDLA立体复合膜的断裂应变高于线型PLLA膜。通过改变支化聚乳酸的相对分子质量，可以很容易地控制共混物或线状PLLA/支化PLLA立体复合膜的力学性能。(C)2005爱思唯尔有限公司。保留所有权利。
Branched poly(lactide)(PLA)s with various lengths of graft chain were synthesized by ring-opening polymerization of L- or D-lactide (L- or DLA) in bulk. using polyglycidol as a macromitiator. The properties of polymer films of branched PLLA or PDLA obtained and their stereocomplex were investigated through thermal analysis and tensile testing. The branched PLLA or PDLA film exhibited a lower glass transition temperature (T-m), melting temperature (T-m). crystallinity, Young's modulus and a higher strain at break than the corresponding linear PLLA or PDLA film. The branched PLLA/branched PDLA stereocomplex film showed a high maximum stress and a high Young's modulus keeping its high strain at break. Moreover, the usefulness of branched PLLA or PDLA as a plasticizer of linear PLLA was investigated with 1:9 blend or stereocomplex film prepared from the branched PLLA or branched PDLA and linear PLLA. The blend or linear PLLA/branched PDLA stereocomplex film showed a higher strain at break compared with linear PLLA film. The mechanical properties of the blend or linear PLLA/branched PLLA stereocomplex film could easily be controlled by changing the molecular weight of branched PLA. (c) 2005 Elsevier Ltd. All rights reserved.