Influences of molecular weight and crystalline structure on fracture behavior of controlled-rheology-polypropylene prepared by reactive extrusion
Influences of molecular weight and crystalline structure on fracture behavior of controlled-rheology-polypropylene prepared by reactive extrusion
复制标题
分子量和晶体结构对反应挤出可控流变聚丙烯断裂行为的影响
DOI：
10.1016/j.polymdegradstab.2007.09.011
复制
发表时间：
2008
影响因子：
5.9
通讯作者：
Li, Bin
中科院分区：
文献类型：
--
作者：
Sheng, Bi-Ru;Feng, Han-Min;Yang, Ming-Bo;Xie, Bang-Hu;Yang, Wei;Li, Bin
采用反应挤出法，通过引入过氧化二异丙苯（DCP）调节乙烯-嵌段共聚聚丙烯（co-PP）的分子量，研究了分子量对共聚物结晶行为、结晶形态和断裂行为的影响。结果发现，随着DCP含量的增加，分子量（MW）下降，多分散性（Mw/Mn）略有下降。改性后，球晶的数量增加，模糊的边界，和球晶的尺寸更均匀，由于增加量的接枝和微交联结构，产生在共聚PP降解，这是作为成核剂。用断裂基本功法计算，发现比断裂基本功we强烈地依赖于分子量，特别是数均分子量（Mn），而比非基本功βwp随z均分子量（Mz）的降低而增大，这可能是由于降解共聚PP中超高分子量组分的减少所致。
The molecular weight of ethylene-block-co-polypropylene (co-PP) was adjusted by reactive extrusion with the incorporation of dicumyl peroxide (DCP), and the effect of molecular weight on the crystallization behavior, crystal morphology, and fracture behavior was investigated. It was found that, with increasing DCP content, the molecular weight (MW) decreased and the polydispersity (Mw/Mn) slightly decreased. After modification, the number of spherulites with obscure boundaries increased, and the size of the spherulites was more even due to increasing amount of grafting and micro-cross-linking structures, generated in co-PP degradation, which were acting as nucleating agents. Evaluated by essential work of fracture method, the specific essential work of fracture, we, was found to be strongly dependent on the molecular weight, especially, on the number average molecular weight (Mn) linearly, while the specific non-essential work of fracture, βwp, was enhanced with decreasing z-average molecular weight (Mz), probably owing to the reduction of ultra-high molecular weight component in degraded co-PP.
登录
查看更多内容
DOI：
10.1017/cbo9781139165167
发表时间：
2004
期刊：
--
影响因子：
--
作者：
J. E. Mark;Kia Ngai;W. Graessley;L. Mandelkern;E. Samulski;J. Koenig;G. Wignall
通讯作者：
J. E. Mark;Kia Ngai;W. Graessley;L. Mandelkern;E. Samulski;J. Koenig;G. Wignall
影响因子：
4.5
作者：
D. Mouzakis;F. Stricker;Rolf Mülhaupt;J. Karger-Kocsis
通讯作者：
D. Mouzakis;F. Stricker;Rolf Mülhaupt;J. Karger-Kocsis
影响因子：
4.6
作者：
Q. Fu;Yongfeng Men;G. Strobl
通讯作者：
Q. Fu;Yongfeng Men;G. Strobl
影响因子：
3
作者：
Wei Yang;Bang-hu Xie;Wei Shi;Zhong‐Ming Li;Zhengying Liu;Jun Chen;Ming‐bo Yang
通讯作者：
Wei Yang;Bang-hu Xie;Wei Shi;Zhong‐Ming Li;Zhengying Liu;Jun Chen;Ming‐bo Yang
影响因子：
3
作者：
Machado, AV;Maia, JM;Covas, JA
通讯作者：
Covas, JA