3D Nanometer-Scale Study of Coexisting Bicontinuous Morphologies in a Block Copolymer/Homopolymer Blend
3D Nanometer-Scale Study of Coexisting Bicontinuous Morphologies in a Block Copolymer/Homopolymer Blend
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DOI：
10.1002/marc.200600344
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发表时间：
2006-09
影响因子：
4.6
通讯作者：
H. Jinnai;H. Hasegawa;Y. Nishikawa;G. Sevink;M. Braunfeld;D. Agard;R. Spontak
中科院分区：
文献类型：
--
作者：
H. Jinnai;H. Hasegawa;Y. Nishikawa;G. Sevink;M. Braunfeld;D. Agard;R. Spontak
研究了大相分离聚（苯乙烯-嵌段异戊二烯）二嵌段共聚物/均聚苯乙烯（SI/hS）共混体系中有序和无序共存的双连续形态。两相行为归因于较高的hS/S质量比（0.92）。根据透射电子显微断层扫描（tem）生成的三维（3D）图像所识别的晶体学特征和通道配位，将其有序形态归类为陀螺。报告了直接从tem图像测量的两种双连续形态的三维局部和全局拓扑特征。将无序形态进一步与分子场模拟进行比较，以确定混合物中组成物种的空间分布，从而证明高分辨率3D成像与分子水平模拟相结合的实用性。
Coexisting bicontinuous morphologies, one ordered and one disordered, are investigated in a macrophase-separated poly(styrene-block-isoprene) diblock copolymer/ homopolystyrene (SI/hS) blend. Two-phase behavior is attributed to the relatively high hS/S mass ratio (0.92). According to its crystallographic signature and channel coordination as discerned from three-dimensional (3D) images generated by transmission electron microtomography (TEMT), the ordered morphology is classified as gyroid. The 3D local and global topological characteristics of both bicontinuous morphologies as measured directly from TEMT images are reported. The disordered morphology is further compared with molecular-field simulations to ascertain the spatial distribution of the constituent species within the blend, thereby demonstrating the utility of high-resolution 3D imaging coupled with molecular-level simulations.