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Citation: Xu Yang, Yu Fushen, Zhou Enle, Qian Baogong. ON THE RELATION OF MOLECULAR WEIGHT AND TEMPERATURE WITH THE CRYSTALLIZATION BEHAVIOUR OF cis-POLYBUTADIENE[J]. Chinese Journal of Applied Chemistry, ;1984, 1(3): 51-56. shu

ON THE RELATION OF MOLECULAR WEIGHT AND TEMPERATURE WITH THE CRYSTALLIZATION BEHAVIOUR OF cis-POLYBUTADIENE

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 8 February 1984
Available Online: 27 March 1984

It has been shown that cis-1,4-polybutadiene obtained by rare-earth ca-talyst (Ln-PB) possesses a cis-1,4-content higher than 98%,and can be cry-stallized rapidly at low temperature. This paper presents our study on the relation of molecular weight and temperature with the crystallization beha-viour of Ln-PB with dilatometer and electron microscope. A set of crystallization rate curves of Ln-PB is given in this paper. It is seen that the minimum rate of crystallization occurs in the range of < M >_η=4.6-6.7×10⁵, while the maximum rate in the range of < M >_η=3.0-3.8×10⁶.The result has been interpreted in terms of the nucleus theory of crystallization. It is also shown that, for Ln-PB, there is a transition at about -20℃ from regime Ⅰ to regime Ⅱ as crystallization temperature decreases. The interfacial free energy of Ln-PB, σ_e, is to be about 17erg/cm², when < M >_η<10⁶, which increases with increasing molecular weight when < M >_η>10⁶.
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