引用本文:
余赋生, 徐桂英, 张世村, 宋襄玉. 稀土丁二烯-异戊二烯无规共聚物低温转变的研究[J]. 应用化学,
1983, 1(1): 58-65.
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.
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.
稀土丁二烯-异戊二烯无规共聚物低温转变的研究
摘要:
本文研究了稀土丁二烯-异戊二烯无规共聚物的低温转变性能。实验证明,这类聚合物的玻璃化转变温度、结晶速率和最大主级结晶值都随共聚比的变化而变化,当丁/异戊重量组成比为84/16时,系不完全结晶橡胶。从丁二烯-异成戊二烯共聚物(不同共聚比)的最大结晶速率温度(TCmax)用外推法可求得稀土顺丁橡胶的最大结晶速率温度为-72℃,这在文献上尚未见报导。稀土顺丁橡胶的玻璃化温度(Tg)为-113℃,其TCmax(°K)/Tg(°K)=0.796,而天然橡胶的TCmax(°K)/Tg(°K)=0.814,两者具有与0.80相近的值。
English
THE STUDY OF LOW-TEMPERATURE TRANSITIONS OF RANDOM COPOLYMER OF BUTADIENE AND ISOPRENE PREPARED WITH PARE-EARTH CATALYST SYSTEM
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 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, 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.
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