Polyethylene-poly(L-lactide) diblock copolymers: Synthesis and compatibilization of poly(L-lactide)/polyethylene blends
Polyethylene-poly(L-lactide) diblock copolymers: Synthesis and compatibilization of poly(L-lactide)/polyethylene blends
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DOI：
10.1002/pola.1254
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发表时间：
2001-08-15
影响因子：
--
通讯作者：
Hillmyer, MA
中科院分区：
文献类型：
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作者：
Wang, YB;Hillmyer, MA
以端羟基聚乙烯（PE-OH）为大分子引发剂，通过L-丙交酯的开环聚合，合成了聚乙烯-聚（L-丙交酯）嵌段共聚物（PE-b-PLLA）。采用溶液共混、沉淀、模压等方法制备了聚L-乳酸（PLLA）/极低密度聚乙烯（LDPE）二元共混物和PLLA/LDPE/PE-b-PLLA三元共混物。粒径分析和扫描电镜结果表明，PE-b-PLLA的加入使分散在PLLA基体中的LDPE的粒径及其分布急剧减小。三元共混物的拉伸和悬臂梁冲击试验结果表明，显着改善的韧性相比，PLLA均聚物或相应的PLLA/LDPE二元共混物。(C)John Wiley & Sons，Inc.
A model polyethylene-poly(L-lactide) diblock copolymer (PE-b-PLLA) was synthesized using hydroxyl-terminated PE (PE-OH) as a macroinitiator for the ring-opening polymerization Of L-lactide. Binary blends, which contained poly(L-lactide) (PLLA) and very low-density polyethylene (LDPE), and ternary blends, which contained PLLA, LDPE, and PE-b-PLLA, were prepared by solution blending followed by precipitation and compression molding. Particle size analysis and scanning electron microscopy results showed that the particle size and distribution of the LDPE dispersed in the PLLA matrix was sharply decreased upon the addition of PE-b-PLLA. The tensile and Izod impact testing results on the ternary blends showed significantly improved toughness as compared to the PLLA homopolymer or the corresponding PLLA/LDPE binary blends. (C) 2001 John Wiley & Sons, Inc.