Matière Molle et Chimie, École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI)-CNRS, UMR-7167, Paris Sciences et Lettres (PSL) Research University, 10 Rue Vauquelin, 75005 Paris, France.
Science. 2017 Apr 7;356(6333):62-65. doi: 10.1126/science.aah5281.
Windmills, cars, and dental restoration demand polymer materials and composites that are easy to process, assemble, and recycle while exhibiting outstanding mechanical, thermal, and chemical resistance. Vitrimers, which are polymer networks able to shuffle chemical bonds through exchange reactions, could address these demands if they were prepared from existing plastics and processed with fast production rates and current equipment. We report the metathesis of dioxaborolanes, which is rapid and thermally robust, and use it to prepare vitrimers from polymers as different as poly(methyl methacrylate), polystyrene, and high-density polyethylene that, although permanently cross-linked, can be processed multiple times by means of extrusion or injection molding. They show superior chemical resistance and dimensional stability and can be efficiently assembled. The strategy is applicable to polymers with backbones made of carbon-carbon single bonds.
风车、汽车和牙科修复需要易于加工、组装和回收的聚合物材料和复合材料，同时还需要具有出色的机械、热和化学稳定性。如果 vitrimers 是由现有塑料制成的，并且可以通过快速的生产速率和当前的设备进行加工，那么它们就可以满足这些需求。vitrimers 是一种聚合物网络，能够通过交换反应来改变化学键。我们报告了二氧杂环硼烷的复分解反应，该反应速度快且热稳定性好，并利用该反应从聚甲基丙烯酸甲酯、聚苯乙烯和高密度聚乙烯等不同聚合物制备了 vitrimers，这些聚合物虽然是永久交联的，但可以通过挤出或注塑多次加工。它们表现出优异的耐化学性和尺寸稳定性，并且可以有效地组装。该策略适用于由碳-碳单键制成的聚合物。
