采用不同硫化体系动态硫化制备三元乙丙橡胶/聚丙烯热塑性硫化胶(EPDM/PP TPVs),并在制备的过程添加不同量的纳米SiO2.结果表明酚醛树脂2402动态硫化得到的EPDM/PP TPVs性能最佳.随着纳米SiO2添加量的增加,EPDM橡胶粒子的粒径先减小后增大,当纳米SiO2的添加量为10份时,EPDM橡胶粒子的粒径达到最小.流变性能研究表明添加纳米SiO2使EPDM/PP TPVs的加工性能变差.动态机械分析仪(DMA)研究表明纳米SiO2提高了TPVs中PP相的玻璃化转变温度.当纳米SiO2的添加量为10份,TPVs的拉伸强度达到最高为23.7 MPa,提高了19.1％,断裂伸长率达到最大为431％,提高了11.1％.纳米SiO2使EPDM/PP TPVs的热稳定性和耐热老化性能变好.%This article reports the preparation,characterization,and properties of the thermoplastic vulcanizate (TPV)ano-SiO2 nanocomposites. We can produce EPDM/PP TPVs with high performance using octylphenol-formaldehyde resin and stannous chloride dehydrate as vulcanizing agents. Morphology study showed that the dimension of EPDM particles decreased with the increase of nano-SiO2 and the minimum dimension of EPDM particles was reached when 10 phr nano-SiO2 was filled. RPA study revealed that the processability of the TPVs become poor by adding nano-SiO2. Thermo-gravimetric study and heat-aging study indicated that thermal stability and heat-aging property could be improved in presence of nano-SiO2. Dynamic mechanical analysis showed that the glass-transition temperature of the PP phase of the nanocomposite increased as compared to virgin TPVs. With the increase of nano-SiO2 concentrations, significant improvement in tensile strength, and elongation at break of TPVs has been achieved.
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