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Citation: 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, 1(1): 58-65. shu

THE STUDY OF LOW-TEMPERATURE TRANSITIONS OF RANDOM COPOLYMER OF BUTADIENE AND ISOPRENE PREPARED WITH PARE-EARTH CATALYST SYSTEM

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 20 December 1982
Available Online: 20 June 1983

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 crystallization 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, Tc_max, 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,T_g of polybutadiene prepared with rare-earth catalyst is-113℃.The ratio of Tc_max(°K)/T_g(°K) is equal to 0.796,and that of natural rubber equals 201/247=0.814,both are close to 0.80.
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