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通过聚苯乙烯大分子单体与乙烯、丙烯共聚得到的乙丙橡胶(EPR)为主干、聚苯乙烯(PS)为支链的接枝共聚物EPR-g-PS,在无化学交联的情况下,模压样品具有与三元乙丙硫化胶可比拟的强度(PS=37.5％,M_(300％)=113公斤/厘米~2,抗张强度=198公斤/厘米~2,伸长率=705％)。聚苯乙烯含量、平均支链数目和成型条件是影响接枝共聚物力学性能的主要因素。聚苯乙烯微区除了以热塑交联网络起到物理交联作用外,在应力作用下本身还发生非弹性形变,起到补强填料的作用,使EPR-g-PS表现出热塑弹性体的性质。
Ethylene propylene rubber (EPR) obtained by the copolymerization of polystyrene macromonomer with ethylene and propylene is the backbone, and the polystyrene (PS) -branched graft copolymer EPR-g-PS is polymerized in the absence of chemical crosslinking In this case, the molded sample had comparable strength to EPDM vulcanizates (PS = 37.5%, M 300% = 113 kg / cm 2, tensile strength = 198 kg / cm 2, elongation = 705%). The content of polystyrene, average number of branches and molding conditions are the main factors affecting the mechanical properties of the graft copolymer. In addition to the thermoplastic cross-linked polystyrene network to play a physical cross-linked polystyrene outside the role of the stress itself underwent non-elastic deformation, play a role in reinforcing filler, EPR-g-PS showed thermoplastic elasticity The nature of the body.