【摘要】 采用IR,GPC,SEM,DSC,DMA,拉伸和冲击实验机等对环管法制得的具有不同乙烯含量的四种抗冲共聚聚丙烯的结构和性能进行了研究。DMA曲线显示四种样品都存在两个Tg转变峰,表明样品中存在EPR相和非晶PP相;随着乙烯含量的增加,Izod冲击强度(23℃,-20℃)增加,而屈服强度、杨氏模量、弯曲强度、弯曲模量、热变形温度、脆化温度和洛氏硬度减小;用SEM观察到四种样品的EPR比较细且均匀地分散在基体中,橡胶粒子的平均粒径范围在0.48μm~0.61μm之间;DSC测得的四种样品的结晶度、ΔHm、ΔHc随乙烯含量的增加而减小。更多还原

【Abstract】 The structure and mechanical properties of four impact copolymer polypropylenes with different ethylene content made by circular tube reactor have been characterized by IR,GPC,SEM,DSC,DMA(Dynamical mechanical analysis),Tension,Izod Impact Tester etc.DMA curves revealed the presence of two Tg peaks in all samples indicating the amorphous phases of ethylene-propylene rubbers and PP.As ethylene content increase,Izod impact strength(at 23 ℃ and-20 ℃) increases while the tensile stress、Young′s modulus、flexural strength、Flexural modulus 、Heat deformation temperature、brittle temperature and Rockwell Hardness decreases.Fine and uniform dispersion were observed by SEM,ethylene-propylene rubbers of four impact copolymer polypropylenes are uniformly dispersed with average particle size ranged from about 0.48 to around 0.61 micrometers.The crystallinity、ΔHm、ΔHc of four impact copolymer polypropylenes as measured with differential scanning calorimery decrease with increasing ethylene content.更多还原