顺丁橡胶增韧等规聚丙烯材料的性能

Properties of isotactic polypropylene toughened by butadiene rubber

采用物理共混的方法,将顺丁橡胶(BR)与等规聚丙烯(IPP)进行共混改性。利用XRD,DSC,POM,SEM等方法研究了BR对IPP/BR共混物的结晶行为及力学性能的影响。实验结果表明,添加5%(w)BR的IPP/BR共混物的结晶峰温度最高,较纯IPP提高了4.55℃,但随BR的不断加入,结晶度不断降低;BR的加入未改变IPP的晶型结构,但使IPP晶体结构出现缺陷;当BR含量为25%(w)时,材料的冲击强度最高为15.58 kJ/m^(2),BR含量为30%(w)时,冲击强度降至12.26 kJ/m^(2),拉伸强度和断裂伸长率分别为28.31 MPa和271.97%。

The physical blending method was used to blend butadiene rubber(BR)with isotactic polypropylene(IPP).The effects of BR on the crystallization behavior and mechanical properties of IPP/BR blends were studied by XRD,DSC,POM and SEM.The experimental results show that the crystallization peak temperature of IPP/BR blends with 5%(w)BR is the highest,which is 4.55℃higher than that of pure IPP,but the crystallinity decreased with the continuous addition of BR.The addition of BR can not change the crystal structure of IPP,but made the crystal structure of IPP defective.When BR content is 25%(w),the maximum impact strength is 15.58 kJ/m^(2),while when BR content is 30%(w),the impact strength decreases to 12.26 kJ/m^(2),and the tensile strength and elongation at break are 28.31 MPa and 271.97%,respectively.