Crosslink densities and phase morphologies in thermoplastic vulcanizates
Crosslink densities and phase morphologies in thermoplastic vulcanizates
复制标题
DOI：
10.1016/j.polymer.2004.03.029
复制
发表时间：
2004-05-11
期刊：
影响因子：
4.6
通讯作者：
Hu, WG
中科院分区：
文献类型：
--
作者：
Ellul, MD;Tsou, AH;Hu, WG
通过改变热塑性硫化PP/三元乙丙橡胶(TPV)中酚类硫化剂的含量来改变其动态硫化过程中的三元乙丙橡胶的交联度。TPV粘度的上升、溶胀度的下降、核磁共振MAS线型的变化以及EPDM域AFM力调制硬度的增加证实了EPDM的交联度随着硫化含量的增加而增加。此外，通过固体核磁共振测定结合的酚类或残留的二烯含量来测量三元乙丙橡胶在热塑性弹性体中的交联度。通过对不同硫化含量的冷面热塑性弹性体和Ru染色热塑性弹性体的扫描电子显微镜分析，研究了硫化处理对三元乙丙橡胶微区尺寸和PP韧带厚度的影响。随着三元乙丙橡胶交联度的增加，三元乙丙橡胶微区尺寸分布变窄，分布的三阶矩减小。相应地，PP韧带数均厚度略有增加。(C)2004年，爱思唯尔有限公司出版。
The degree of EPDM crosslinking during dynamic vulcanization of a PP/ EPDM thermoplastic vulcanizate (TPV) was modified by varying its phenolic curative content. The rise in TPV viscosity, the drop in its swelling, the change in its NMR MAS lineshape, and the increase in its EPDM domain AFM force modulation hardness verified the increase in EPDM crosslink density with increasing curative content. Further, the EPDM crosslink extent in TPV was measured by either the bound phenolic or the residual diene content both determined by solid state NMR. SEM morphologies of cryo-faced and ruthenium-stained TPVs with varying curative contents were analyzed to determine the effects of cure on EPDM domain sizes and PP ligament thickness. A narrowing of the EPDM domain size distribution, with a decrease in the third moment of the distribution, was observed with increasing EPDM crosslink density. Correspondingly, the PP ligament number-average thickness was raised slightly. (C) 2004 Published by Elsevier Ltd.