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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。
In this paper, the low temperature transition properties of rare earth butadiene-isoprene random copolymers were studied. Experiments show that the glass transition temperature, the crystallization rate and the maximum primary crystallization value of these polymers all change with the copolymerization ratio. When the weight ratio of butyl to isoprene is 84/16, it is not completely crystalline rubber. The maximum crystallization temperature of rare earth-butadiene rubber can be obtained by extrapolation from the maximum crystallization rate temperature (TCmax) of the butadiene-isoprene copolymer (different copolymerization ratio), which is reported in the literature Not yet reported. The rare earth butadiene rubber has a glass transition temperature (Tg) of -113 ° C and a TCmax (° K) / Tg (° K) = 0.796 and a natural rubber TCmax (° K) / Tg Have a value similar to 0.80.