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Citation: Xu Yang, Zhou Enle, Yu Fusheng, Qian Baogong. THE EFFECTS OF MOLECULAR WEIGHT AND ENTANGLEMENT OF CIS-1,4-POLYBUTADIENE ON THE CRYSTALLIZATION BEHAVIOR[J]. Chinese Journal of Applied Chemistry, ;1987, 4(1): 48-52. shu

THE EFFECTS OF MOLECULAR WEIGHT AND ENTANGLEMENT OF CIS-1,4-POLYBUTADIENE ON THE CRYSTALLIZATION BEHAVIOR

1.
Changchun Institute of Applied Chemistry Academia Sinica

Corresponding author: Xu Yang,
Received Date: 28 November 1985
Available Online: 12 May 1986

In this paper, the bulk crystallization behavior of cis-1, 4-polybutadiene polymerized with rare-earth catalyst (Ln-PB) has been studied by linear dilatometry, volumetric dilatometry, DSC, TBA, and x-ray diffraction techniques. The effects of molecular weight of Ln-PB on the crystallization rate, melting point, glass temperature, and specific crystal surface free energy has been investigated in a wide range of molecular weight and crystallization temperature. It has been found that the crystallization rate increases initially with increasing the density of chain entanglement networks, through a maximum, and declines. Thereafter using secondary nucleation theory and taking into account the effect of the entanglement on the crystallization, a crystallization kinetic equation of Ln-PB which is quite adequate experimental data could be derived.
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