摘要
通过力学性能测试、动态力学试验、DSC 分析以及材料断面形貌与结构分析等手段,对以纳米二氧化硅(SiO2) 为刚性微粒、以三元乙丙橡胶(EPDM) 为弹性微粒组成的聚丙烯(PP)/ 纳米SiO2/EPDM 的同时增强增韧效果进行了研究.结果显示,上述两种微粒可同时大幅度提高PP 的韧性、强度和模量,当PP/ 纳米SiO2/EPDM 为80/3/20 时,两种微粒体现较明显的协同增韧效应.纳米SiO2 可提高PP 的结晶温度和结晶速度,并使球晶细化.纳米SiO2 刚性微粒在PP连续相中以微粒团聚体形态分布,构成团聚体的平均微粒数约为6 ~7 ,其与PP基体表现出较强的结合牢度.PP/ 纳米SiO2/EPDM 的综合性能已接近或达到工程塑料的性能.
The reinforcing and toughening effects of PP blends were studied by the determination of the mechanical properties, dynamic mechanical analysis, DSC, as well as morphology and structures of the cross\|sections, which were reinforced by nano\|SiO\-2 rigid particles and toughened by EPDM elastic particles. It was shown that, the above two particles dispersed in PP matrix can increase not only the tougheness but also the strength and the modulus of PP at a great extent. As the blend ratio of PP/nano\|SiO\-2/EPDM is 80/3/20, the two particles have the concerted toughening effect. Nano\|SiO\-2 particles can also increase the crystallization temprature and crystallization rate of PP and decrease its size of spherulite. Nano\|SiO\-2 particles are dispersed in the PP continuous phase in the form of conglomerates which are made up of 6~7 nano\|SiO\-2 particles in average and have a good combination strength with PP matrix. The comprehensive properties of the PP/nano\|SiO\-2/EPDM can match with the engineering plastics.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2000年第1期99-104,共6页
Acta Polymerica Sinica
关键词
聚丙烯
橡胶
增强
增韧
纳米微粒
塑料改性
Polypropylene, Nano\|particle, Rigid\|particle, Elastic\|particle, Reinforcing, Toughening