期刊文献+

聚丙烯基共混体系拉伸流变配方设计

Extensional Rheological Formula Design of Polypropylene Based Blending Systems
下载PDF
导出
摘要 研究了具有不同主链结构的聚乙烯(PE)和不同熔融指数的线型等规聚丙烯(iPP)的引入对PP体系拉伸流变行为的影响。结果表明:体系中加入UHMWPE后,熔体拉伸粘度大幅提高,但制品外观不平滑无光泽;加入POE与HDPE后熔体拉伸粘度也提高,但与LDPE相比要低;iPP的熔值越小分子量越大,体系的拉伸粘度越大,且加入少量HMSPP后出现明显的应变硬化现象;共聚聚丙烯(cPP)含量越多,体系拉伸粘度也越大,但含量越多体系拉伸屈服强度越低。因此,加入适量的LDPE与cPP或采用低熔指高分子量的iPP能提高体系的拉伸粘度,从而改善制品热成型性能。 The influence of various PE and molecular weight of PP on the extensional rheology behavior of iPP was studied. The results showed that extensional viscosity of melts increased largely but the surfaces of products were not smooth and had no luster when UHMWPE was added to iPP system. Comparing with adding POE and HDPE to iPP, LDPE had a greater contribution to extensional viscosity. The MFR of iPP was smaller and smaller or the molecular weight of iPP was larger and larger, the exteflsional viscosity was also enhanced significantly, and the phenomenon of strain-hardening was also more and more evident after HMSPP was added to iPP. Meanwhile, the extensional viscosity of system increased with adding more quantity of cPP, but the tensile yielding strength could decrease dramatically. Therefore, adding proper quantity of LDPE and cPP or employing iPP with lower MFR or high molecular .weight could enhance the extensional viscosity of melts, and so improving the thermoforming property.
出处 《四川化工》 CAS 2014年第1期16-19,共4页 Sichuan Chemical Industry
关键词 聚乙烯 聚丙烯 拉伸流变 拉伸粘度 热成型 polyethylene polypropylene tensile rheology tensile viscosity thermoforming
  • 引文网络
  • 相关文献

参考文献12

二级参考文献373

共引文献115

相关主题

;
使用帮助 返回顶部