Chinese Journal of Applied Chemistry ›› 1983, Vol. 0 ›› Issue (1): 58-65.
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Yu Fusheng, Xu Guiying, Zhang Shuchun, Song Xiangyu
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Abstract: This paper reports our work on low-temperature transitions of random copolymer of butadiene and isoprene prepared with rare-earth catalyst.It is shown by experiments that the glass transition temperature, the crystalliza-tion rate and the maximum main crystallization value of these copolymers vary with monomer ratio in the copolymer.When the weight ratio of buta-diene/isoprene reaches 84/16, the copolymer becomes noncrystallizable rubber. The maximum crystallzation rate temperature, Tcmax, of polybutadiene prepared with rare-earth catalyst was obtained as-72℃ by extrapolation of the experimental data of copolymer with various monomer ratio,which has not been reported in literature. The glass temperature,Tg of polybutadiene prepared with rare-earth catalyst is-113℃.The ratio of Tcmax(°K)/Tg (°K) is equal to 0.796,and that of natural rubber equals 201/247=0.814,both are close to 0.80.
Yu Fusheng, Xu Guiying, Zhang Shuchun, Song Xiangyu. THE STUDY OF LOW-TEMPERATURE TRANSITIONS OF RANDOM COPOLYMER OF BUTADIENE AND ISOPRENE PREPARED WITH PARE-EARTH CATALYST SYSTEM[J]. Chinese Journal of Applied Chemistry, 1983, 0(1): 58-65.
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