引用本文:
张延寿, 余赋生. 分子量分布对双烯聚合物粘弹性能的影响Ⅱ.顺-1,4-聚异戊二烯的粘弹性能对分子量及其分布的依赖关系[J]. 应用化学,
1986, 3(5): 18-21.
Citation: Zhang Yanshou, Yu Fusheng. THE INFLUENCE OF MOLECULAR WEIGHT DISTRIBUTION ON THE VISCOELASTIC PROPERTIES OF DIENE POLYMERS Ⅱ. DEPENDENCE OF VISCOELASTIC PROPERTIES ON THE MOLECULAR WEIGHT AND ITS DISTRIBUTION OF POLY(CIS-1,4-ISOPRENE)[J]. Chinese Journal of Applied Chemistry, 1986, 3(5): 18-21.
Citation: Zhang Yanshou, Yu Fusheng. THE INFLUENCE OF MOLECULAR WEIGHT DISTRIBUTION ON THE VISCOELASTIC PROPERTIES OF DIENE POLYMERS Ⅱ. DEPENDENCE OF VISCOELASTIC PROPERTIES ON THE MOLECULAR WEIGHT AND ITS DISTRIBUTION OF POLY(CIS-1,4-ISOPRENE)[J]. Chinese Journal of Applied Chemistry, 1986, 3(5): 18-21.
分子量分布对双烯聚合物粘弹性能的影响Ⅱ.顺-1,4-聚异戊二烯的粘弹性能对分子量及其分布的依赖关系
摘要:
本文利用凝胶渗透色谱和应力松弛方法研究了顺-1,4-聚异戊二烯的粘弹性能对分子量及分布的依赖性。实验结果表明,生胶的松弛模量和最长松弛时间与分子量和分子量分布都有依赖关系,主要是改变τm=KMwβ关系中的K值,对β值的影响甚小。由于本体聚合物的链缠结而导致的非牛顿效应使生胶的τm与Mw的关系偏离3.4法则,这可用缠结网络密度来校正。探讨了生胶的应力松弛过程是橡胶分子链的滑移和解缠结兼有的两种运动。低分子量级份对链缠结网络有显著影响,起稀释剂作用,使网络的临界缠结分子量增高。
English
THE INFLUENCE OF MOLECULAR WEIGHT DISTRIBUTION ON THE VISCOELASTIC PROPERTIES OF DIENE POLYMERS Ⅱ. DEPENDENCE OF VISCOELASTIC PROPERTIES ON THE MOLECULAR WEIGHT AND ITS DISTRIBUTION OF POLY(CIS-1,4-ISOPRENE)
Abstract:
The dependence of viscoclastic properties on the molecular weight and MWD of cis-1,4-polyisoprene has been studied with the methods of GPC and stress relaxation. The results show that the relaxation modulus and the maximum relaxation time of Ln-PIR depend not only on the molecular weight, but also on the MWD.The value of K changes with MWD, but the β is essentially constant in the relationship of τm=KMwβ. Higher chain entanglement density leads to the non Newtonian effect of Ln-PIR.Hence,the relationship between τm and Mw deviates from the 3.4th power rule. This may be corrected with the density value of chain entanglement. The low molecular weight fractions act as a diluent in the chain entanglement networks. The samples with broader MWD have higher critical molecular weight Mc ofentanglement networks.
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