采用偏光显微镜和DSC技术研究了聚苯乙烯-聚氧乙烯-聚苯乙烯(PS-b-PEO-b-PS)三嵌段共聚物的结晶行为。实验结果表明,随着共聚物中聚氧乙烯含量的降低,形成清晰球晶的能力减弱,结晶度(Xc)、结晶熔融温度(Tm)、结晶温度(Tc)降低;先微相分离再结晶和微相分离与结晶同时进行两种热历史,前者会损失体系的Xc、Tm;当共聚物中聚氧乙烯的数均分子量为2000、质量分子数为18%和34%时,发现了等速降温双结晶峰。
The crystallization behavior of polystyrene-b-poly(ethyrene oxide)-b-polystyrene triblock(PS-b-PEO-b-PS) copolymers was investigated by optical microscopy and DSC technologies. The result shows that the PEO phase has a decreasing propensity for spherical crystallization and less cleaner spherical structures as the PEO content of the copolymers decreases. The Xc, Tm and Tc decreases with decreasing PEO content. There exists a depression of Xc and Tm, if the micro-phase separation is firstly formed before crystallization occurred, in comparison with that the micro-phase separation and crystallization take place at a same time.
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