Structural change with blending of crystalline/amorphous block copolymers having different types of microphase separations
Structural change with blending of crystalline/amorphous block copolymers having different types of microphase separations
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DOI：
10.1016/j.polymer.2011.11.004
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发表时间：
2011-12-13
期刊：
影响因子：
4.6
通讯作者：
Uehara, Hiroki
中科院分区：
文献类型：
--
作者：
Kakiage, Masaki;Sekiya, Miho;Uehara, Hiroki
将两种具有双连续和球形微相分离的聚苯乙烯/聚乙烯嵌段共聚物以不同比例共混。初始膜通过热二甲苯溶解制备，然后流延和干燥。将得到的膜在不同温度下熔融并等温结晶。差示扫描量热法熔融峰温度的等温结晶的薄膜表明，特征晶体生长发生在临界双连续/球形共混比为90/10和85/15。晶体结构由内部的纯晶体和外部的缺陷晶体组成。这些共混膜的透射电子显微镜观察表明，逐步隔离的非晶相的增加，在球形组件。具体而言，在上述临界共混比下，得到了双连续和球形结构的混合形态。分析认为，这种独特的形貌是晶核效应和竞争生长效应共同作用的结果。(C)2011爱思唯尔有限公司保留所有权利。
Two kinds of polystyrene/polyethylene diblock copolymers exhibiting bicontinuous and spherical microphase separations were blended at different ratios. Initial films were prepared by hot xylene dissolution, followed by casting and drying. The obtained films were melted and isothermally crystallized at various temperatures. Differential scanning calorimetry melting peak temperatures for the isothermally crystallized films suggested that characteristic crystal growth occurred at critical bicontinuous/spherical blend ratios of 90/10 and 85/15. The crystalline structure consisted of interior pure crystals and exterior defective crystals. Transmission electron microscopy observations of these blended films indicated the progressive isolation of the amorphous phase with increases in the spherical component. Specifically, the mixed morphologies of both the bicontinuous and spherical structures were obtained for the above critical blend ratios. Analysis implied that this unique morphology was formed as a result of the combination of the crystal nucleus effect and the competitive growth effect. (C) 2011 Elsevier Ltd. All rights reserved.