【摘要】 选用新型稀土β成核剂(WBGⅡ)对无规共聚聚丙烯(PPR)进行改性。借助广角X射线衍射(WAXD)、差示扫描量热仪(DSC)及偏光显微镜(POM)研究了稀土β成核剂诱导无规共聚聚丙烯的结晶行为及晶体形态;并研究了WBGⅡ对PPR力学性能和热变形温度(HDT)的影响。结果表明,加入少量WBGⅡ后,PPR的晶型和结晶形态均发生变化;非等温结晶过程的结晶温度(Tc)从95.8℃提高到102.1℃;PPR的冲击强度提高24%,拉伸和弯曲性能却略有下降;热变形温度提高20℃。更多还原

【Abstract】 In the study,a new rare-earth β-nucleating agent(WBGⅡ) was used to modify ethylene-propylene random copolymer(PPR).By means of wide-angle X-ray diffraction(WAXD),differential scanning calorimeter(DSC) and polarizing optical microscope(POM),the crystallization behavior and morphology of PPR induced by WBGⅡwere studied.The effect of β nucleating agent on mechanical property and heat distortion temperature(HDT) was researched also.The results show that βform nucleating agent WBGⅡ can change the crystal structure of PPR and rise the maximums of exothermic peaks(Tc) of non-isothermal crystallization from 95.8 ℃ to 102.1 ℃.The tensile and bend capability decrease a little and the impact strength increases by 24%.The HDT is risen by 20 ℃.更多还原