摘要
研究了苯乙烯-乙烯/丁烯-苯乙烯嵌段共聚物(SEBS)分子量和分子结构对其共混物的力学性能、永久压缩变形和流变性能的影响。结果表明:高分子量的线型SEBS拥有更优的力学性能,更低的高温永久压缩变形;当SEBS的分子量大于临界分子量(7×104~10×104 g/mol之间)时,其室温永久压缩变形不受分子量和分子结构的影响;星型SEBS较线型含有更多的二嵌段苯乙烯-乙烯/丁烯(SEB),其分子量越高,二嵌段SEB含量越高;SEBS的分子量越大,苯乙烯含量越高,共混物的熔体黏度就越大,表观剪切黏度对剪切速率的敏感性越强。
The effects of molecular weight and molecular structure of styrene ethylene/butylene styrene block copolymer（SEBS） on the mechanical properties, permanent compressive deformation and rheological properties of the blends were investigated. The results show that： The linear SEBS with high molecular weight has better mechanical properties and lower permanent compression deformation at high temperature. When the molecular weight of SEBS is higher than the critical molecular weight（between 7×104-10×104 g/mol）, the compression set of its compound at ambient temperature is independent of its molecular weight and molecular structure. Compared with linear SEBS, the radial counterpart comprises higher polystyrene-block-poly（ethylene-co-1-butene） diblock copolymer（SEB） content. The higher molecular weight the radial SEBS has, the higher content of SEB it comprises. The compound comprising SEBS with higher molecular weight and higher styrene content has higher melt viscosity. Its apparent shear viscosity is more sensitive to shear rate.
出处
《塑料科技》
CAS
北大核心
2017年第12期48-51,共4页
Plastics Science and Technology
基金
南通市科技项目"低弯曲模量耐高温管芯材料"(GY22015016)
