Effect of microdomain structure and process conditions on the mechanical Behavior of cylindrical block copolymer systems
Effect of microdomain structure and process conditions on the mechanical Behavior of cylindrical block copolymer systems
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DOI：
10.1021/ma070006
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发表时间：
2007-10-02
期刊：
影响因子：
5.5
通讯作者：
Lesser, Alan J.
中科院分区：
文献类型：
--
作者：
Mamodia, Mohit;Panday, Ashoutosh;Lesser, Alan J.
研究了工艺条件对柱状相分离聚(苯乙烯-乙烯-丁烯-苯乙烯)(SEBS)三嵌段共聚物体系结构特征和力学响应的影响。用小角X射线衍射仪(SAXD)和透射电子显微镜(TEM)分别研究了微区和晶粒结构。在单调拉伸和循环试验中，观察到随着不同的工艺条件和热处理而发生的组织变化改变了力学行为。结果表明，d间距随温度的升高和熔体冷却速度的增加而减小。D间距的这些细微变化与弹性模数有关。磁区间距和尺寸的这种变化取决于系统的分离功率(X_I)。晶粒度随冷却速度和细晶组织的退火而发生显著变化，但对材料的弹性系数影响不大。
We investigate the effect that process conditions have on the structural characteristics and mechanical response of a cylindrically phase-separated poly(styrene-ethylene-co-butylene-styrene) (SEBS) triblock copolymer system. Small-angle X-ray diffraction (SAXD) and transmission electron microscopy (TEM) have been used to study the microdomain and grain structure, respectively. It is observed that the structural changes that occur with different process conditions and thermal treatment alter the mechanical behavior in both monotonic tensile and cyclic tests. Results show that the d-spacing decreases with increasing temperature and increasing cooling rate from the melt state. These subtle changes in d-spacing are correlated with the elastic modulus. Such variations in domain spacing and size depend on the segregation power (chi) of the system. Grain size changes significantly with cooling rate and upon annealing fine-grain structures but has no significant effect on the material's modulus.