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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. shu

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)

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 26 April 1985
Available Online: 24 October 1985

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 τ_m=KM_w^β. Higher chain entanglement density leads to the non Newtonian effect of Ln-PIR.Hence,the relationship between τ_m and M_w 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 M_c ofentanglement networks.
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