Rubber Networks Containing Unattached Macromolecules. VI. Stress Relaxation in End‐Linked Polybutadiene with Unattached Linear Polybutadiene
Rubber Networks Containing Unattached Macromolecules. VI. Stress Relaxation in End‐Linked Polybutadiene with Unattached Linear Polybutadiene
复制标题
含有未连接大分子的橡胶网络VI。末端连接的聚丁二烯与未连接的线性聚丁二烯的应力松弛。
DOI：
10.1122/1.549627
复制
发表时间：
1981
影响因子：
3.3
通讯作者：
J. Ferry
中科院分区：
文献类型：
--
作者：
C. R. Taylor;Hsin;G. W. Nelb;J. Ferry
单轴拉伸中的应力松弛已在二羟基封端聚丁二烯网络中进行了研究，顺式：反式：乙烯基=26：38：36，由三苯基甲烷-4，4 ′，4 ″-三异氰酸酯交联，含有9.3%重量的未连接聚丁二烯，具有相似的微观结构，各种分子量，重量与数均分子量比为1.15至1.50。还对不含未连接物质的网络和大多数各种未交联的线性聚合物进行了应力松弛测量;对于后者中的两种，通过转换复数剪切模量的动态测量获得了等效数据。拉伸比通常为1.25，杨氏松弛模量由neo-Hookean应力-应变松弛计算。对于未交联的聚合物，松弛模量E11（t）对应于相当窄的松弛时间分布，其大小与粘均分子量的3.2次方近似成比例。控制器...
Stress relaxation in uniaxial extension has been studied in networks of dihydroxy‐terminated polybutadiene, cis:trans:vinyl=26:38:36, cross‐linked by triphenyl methane‐4,4′,4″‐triisocyanate and containing 9.3% by weight of unattached polybutadiene with similar microstructure, various molecular weights, and weight to number‐average molecular weight ratios of 1.15 to 1.50. Stress relaxation measurements were made also on networks containing no unattached species and on most of the various uncross‐linked linear polymers; for two of the latter, equivalent data were obtained by conversion of dynamic measurements of the complex shear modulus. The stretch ratio was usually 1.25 and the Young's relaxation modulus was calculated from the neo‐Hookean stress‐strain relaxation. For the uncross‐linked polymers, the relaxation modulus E11(t) corresponded to a rather narrow distribution of relaxation times whose magnitudes were approximately proportional to the 3.2 power of viscosity‐average molecular weight. The contri...