摘要
乙烯-辛烯共聚物(POE)在有效改善聚丙烯(PP)韧性的同时伴随着复合材料刚性的大幅度降低,因此,研究了球状的碳酸钙、硫酸钡,层状的滑石粉,以及针状的硅灰石等形貌尺寸不同的刚性粒子对PP/POE体系冲击韧性的影响,其中,粒径为2. 5μm的碳酸钙与POE按照一定比例与聚丙烯共混时,具有较好的协同增韧作用,在PP/POE增韧体系基础上,加入3%粒径为2. 5μm的碳酸钙,冲击强度从30. 4 k J/m2提高到43. 4 k J/m2。仪器化冲击测试表明,韧性的改善主要是提高了材料的裂纹扩展能。通过扫描电子显微镜(SEM)观察了材料断面的微观形貌,发现碳酸钙和POE在聚丙烯基体中主要形成独立分散相,提出了三元复合体系的协同增韧微观机制。
The introduction of ethylene-octene copolymer( POE) into polypropylene( PP) could improve the impact toughness,however decrease its stiffness sharply. Therefore,the effects of different rigid particles on the mechanical properties of PP/POE systems were studied,including spherical shaped calcium carbonate and barium sulfate,flake-like talcum and needle-like wollastonite. Synergistic effect on the toughening of PP was observed when blending PP,POE and calcium carbonate with a size of 2. 5 μm within a certain mass ratio,the impact strength was improved from 30. 4 k J/m2 to 43. 4 k J/m2 as adding 3% calcium carbonate of 2. 5 μm into PP/POE system. The results of instrumented impact testing proved that the improvement of toughness was mainly attributed to the increase of crack propagation energy. Scanning electron microscope(SEM) images demonstrated that separated morphology was formed in Ca CO3/POE/PP ternary composite,in view of above results,the possible toughening mechanism for ternary composite system was proposed.
作者
尹朝清
刘乐文
张爽爽
YIN Chaoqing;LIU Lewen;ZHANG Shuangshuang(Shanghai Kingfa Science&Technology Co.,Ltd.,Shanghai 201714,China;Shanghai Engineering Research Center of Functionalizing Engineering Plastics,Shanghai 201714,China;Jiangsu Kingfa Science&Technology Advanced Materials Co.,Ltd.,Kunshan,Jiangsu 215300,China)
出处
《塑料》
CAS
CSCD
北大核心
2019年第1期53-57,共5页
Plastics
关键词
聚丙烯
刚性粒子
POE
增韧
仪器化冲击
polypropylene
rigid particles
POE
toughening
instrumented impact
