论文部分内容阅读
用正电子湮没技术,在-80°～100℃温度范围内,测量了苯乙烯-异戊二烯-苯乙烯三嵌段聚合物(SIS)的正电子寿命谱。在长寿命成分的温度谱中,实验发现除了有和聚异戊二乙烯及聚苯乙烯的玻璃化温度相对应的温度转变区外,在37℃还存在一个温度转变区。这个中间转变温度可以解释为SIS嵌段共聚物的中间相的玻璃化转变温度。
Positron annihilation was used to measure the positron lifetime of styrene-isoprene-styrene triblock polymer (SIS) in the temperature range of -80 ° -100 ° C. In the temperature spectrum of long-lived components, it is found that there is a temperature transition zone at 37 ° C in addition to the temperature transition zone corresponding to the glass transition temperature of polyisoprene and polystyrene. This intermediate transition temperature can be interpreted as the glass transition temperature of the mesophase of the SIS block copolymer.