聚苯基硅氧烷微球对聚丙烯结构与性能的影响

Effect of Polyphenylsiloxane Microspheres on the Structure and Properties of Polypropylene

以无规共聚聚丙烯(PPR)树脂为基体,聚苯基硅氧烷微球(PPSQ)为改性剂,采用注塑成型工艺制备PPSQ/PPR复合材料。通过傅里叶变换红外光谱(FTIR)、差示扫描量热法(DSC)、扫描电镜(SEM)等表征技术,考察PPSQ微球对PPSQ/PPR复合材料化学组成、力学性能、耐热性能、熔融行为及微观结构的影响。结果表明,当PPSQ改性剂添加量为6%时,相较于纯PPR,复合材料弯曲模量提高14.08%、冲击强度降低0.80%、热变形温度提高7.80℃以及结晶度提高8.70%。PPSQ微球可在不基本影响PPR冲击性能基础上,有效改善PPR的耐热性能和刚性。

Polyphenylsiloxane microspheres(PPSQ)/random copolymer polypropylene(PPR)composites were prepared by injection molding using PPR resin as matrix and PPSQ as modifier.The effects of PPSQ microspheres on chemical composition,mechanical properties,heat resistance,melting behavior and microstructure of PPSQ/PPR composites were investigated by Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC)and scanning electron microscope(SEM).The results show that comparing with pure PPR,the bending modulus of the composite increases by 14.08%,the impact strength decreases by 0.80%,the thermal deformation temperature increases by 7.80℃and the crystallinity increases by 8.70%,when the content of PPSQ modifier is 6%.PPSQ microspheres can effectively improve the heat resistance and rigidity of PPR without basically affecting the impact performance of PPR.