两嵌段共聚物在扁长形受限空间的相行为研究  

Phase Behaviors of Diblock Copolymer under Prolate Confinement

作　　者：郭坤琨[1] 吴凯 韩文驰 GUO Kunkun;WU Kai;HAN Wenchi(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;College of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]沈阳化工大学材料科学与工程学院,辽宁沈阳110142

出　　处：《湖南大学学报（自然科学版）》2020年第6期109-115,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(21674034)。

摘　　要：应用自洽场方法模拟计算了本体结构为柱状相的AB两嵌段共聚物在球形和扁长形三维受限空间下的自组装行为.通过改变受限空间的尺寸,系统总结了AB两嵌段共聚物在球形和扁长形受限下的相形态、自由能、构象熵和相互作用能的变化规律并做了比较研究.结果表明,在受限体系中,嵌段共聚物会呈现出多样的相形态;在球形受限中,嵌段共聚物的相形态由于在不同方向上受限程度相同而表现出较好的结构对称性;而在扁长形受限中,共聚物分子链在不同维度方向上会受到不同程度的伸展取向限制,从而其相结构的对称性会被破坏.In the present study,the phase behaviors of the bulk columnar phase AB diblock copolymers under spherical and prolate confinements are studied by the self-consistent field theory.By changing the size of the confined spaces,the developing law of phase morphology,free energy,conformational entropy and interaction energy of AB diblock copolymers are systematically summarized and compared.The results show that,in the confined spaces,diblock copolymers possess various phases.In the spherical confinement,the phase structures of diblock copolymers exhibit better symmetrical characteristics due to the identical frustration suffered from different dimensions.However,because the different frustrations and orientations of polymer chain in different dimension directions are introduced by prolate confinements,the phase structural symmetry of diblock copolymers was significantly broken.

关 键 词：自洽场理论 嵌段共聚物 扁长形 球形 受限尺寸 相结构 

分 类 号：O631[理学—高分子化学]