Microphase Separation vs Crystallization in Polystyrene-b-polybutadiene-b-poly(ε-caprolactone) ABC Triblock Copolymers
Microphase Separation vs Crystallization in Polystyrene-b-polybutadiene-b-poly(ε-caprolactone) ABC Triblock Copolymers
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DOI：
10.1021/ma020128w
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发表时间：
2003-05
期刊：
影响因子：
5.5
通讯作者：
V. Balsamo;C. Navarro;G. Gil
中科院分区：
文献类型：
--
作者：
V. Balsamo;C. Navarro;G. Gil
用差示扫描量热法（DSC）研究了一系列聚苯乙烯-b-聚丁二烯-b-聚己内酯（ABC）三嵌段共聚物的熔融行为和结晶动力学。在高温（150 °C）下，作为退火时间的函数进行研究，保持结晶条件不变。虽然只有16重量%的PCL的共聚物不显示显着的变化与退火时间，它强烈地影响具有较高的PCL含量的共聚物的熔融行为和结晶动力学。因此，通过增加退火时间可以观察到更高的熔点和结晶度，这表明结果显示出微相分离和结晶之间的明显“冲突”。当形成球晶的热力学力和维持熔体中形成的微相形态的热力学力相互竞争时，这一点更加明显。通过Avrami理论的结晶动力学分析表明，
The melting behavior as well as the crystallization kinetics of a series of polystyrene-b-polybutadiene-b-poly(e-caprolactone) ABC triblock copolymers was investigated by differential scanning calorimetry (DSC). The studies were performed as a function of annealing time at high temperature (150 °C), maintaining invariable the crystallization conditions. While a copolymer with only 16 wt % PCL does not show significant changes with the annealing time, it influences strongly the melting behavior and crystallization kinetics of copolymers with higher PCL content. Thus, higher melting points and degree of crystallinity can be observed by increasing annealing time, suggesting the results show a clear “conflict” between microphase separation and crystallization. This is more evident when the thermodynamic force to form spherulites and the thermodynamic force to maintain the microphase morphology formed in the melt compete. The analysis of the crystallization kinetics through the Avrami theory demonstrated that ...