聚碳酸亚丙酯的化学改性

Chemical Modification of Poly(propylene carbonate)

利用温室气体二氧化碳(CO2)与环氧化合物共聚制备具有生物可降解性的脂肪族聚碳酸酯是近年来聚合物科学领域的研究热点之一。其中最受关注的是CO2和环氧丙烷(PO)的交替共聚物-聚碳酸亚丙酯(PPC)。由于PPC的分子间作用力比较弱,致使其热性能和力学性能较差,限制了其规模化生产与应用。三元共聚、嵌段共聚、接枝、扩链、交联和封端等化学方法是调控PPC链结构进而改善其性能的最直接最有效途径。本文对这一研究领域的进展情况进行了综述,探讨了化学改性过程中面临的挑战和问题,指出了未来发展的新趋势,以期促进PPC的开发和应用。

The synthesis of degradable aliphatic polycarbonates(APCs)from greenhouse gas carbon dioxide and epoxides has been a long-standing hotspot in the field of polymer science.Polypropylene carbonate(PPC)produced by the alternating copolymerization of CO2 and propylene oxide has received the most attention because it exhibits many excellent properties and has a wide range of potential applications.Unfortunately,PPC is a weak polar hydrophobic polymer with weak interchain interaction,leading to its relatively low thermal stability and poor mechanical properties.These have limited PPC to practical applications as well as large-scale production.Chemical modification including terpolymerization,block copolymerization,graft copolymerization,chain extension,cross-linking,end-capping and so on is the most immediate and effective route to regulate the chain structure of PPC and further improve its properties.The present paper exhibits a brief review in the recent progress about this topic and discusses the existing problems.Some proposals about the chemical modification of PPC are put forwards to facilitate the development and applications of PPC.