将聚乙烯和聚丙烯结合：通过 PE/PP 多嵌段聚合物实现增强性能。
Combining polyethylene and polypropylene: Enhanced performance with PE/PP multiblock polymers.
机构信息
Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA.
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
出版信息
Science. 2017 Feb 24;355(6327):814-816. doi: 10.1126/science.aah5744.
Polyethylene (PE) and isotactic polypropylene (PP) constitute nearly two-thirds of the world's plastic. Despite their similar hydrocarbon makeup, the polymers are immiscible with one another. Thus, common grades of PE and PP do not adhere or blend, creating challenges for recycling these materials. We synthesized PE/PP multiblock copolymers using an isoselective alkene polymerization initiator. These polymers can weld common grades of commercial PE and PP together, depending on the molecular weights and architecture of the block copolymers. Interfacial compatibilization of phase-separated PE and PP with tetrablock copolymers enables morphological control, transforming brittle materials into mechanically tough blends.
聚乙烯 (PE) 和等规聚丙烯 (PP) 几乎占世界塑料的三分之二。尽管它们的碳氢化合物组成相似，但这些聚合物彼此不混溶。因此，常见等级的 PE 和 PP 不黏附或混合，这给这些材料的回收利用带来了挑战。我们使用等规烯烃聚合引发剂合成了 PE/PP 嵌段共聚物。这些聚合物可以将常见等级的商业 PE 和 PP 焊接在一起，具体取决于嵌段共聚物的分子量和结构。四嵌段共聚物对相分离的 PE 和 PP 的界面增容作用实现了形态控制，将脆性材料转变为机械性能优异的共混物。
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