体相结构为六角柱的ABC星型三嵌段共聚物纳米球受限相行为的理论研究  

Theoretical Study of the Phase Behavior of Cylinder-forming ABC Star Triblock Copolymers Under Spherical Confinement

作　　者：邱文娟 莫兆文 邢玉恒 Wen-juan Qiu;Zhao-wen Mo;Yu-heng Xing(School of Mathematics and Physics,Yancheng Institute of Technology,Yancheng 224051)

机构地区：[1]盐城工学院数理学院,盐城224051

出　　处：《高分子学报》2025年第3期501-514,共14页Acta Polymerica Sinica

基　　金：国家理论物理专款项目(项目号11947015);盐城工学院校级科研项目(项目号xjr2019034,xjr2020038);江苏省高等学校自然科学研究项目(项目号21KJB140022)资助。

摘　　要：利用自洽场理论方法,实现了对A、B两嵌段之间有着一对非常微弱相互作用的A_(0.33)B_(0.33)C_(0.34)星型三嵌段共聚物在纳米球受限下相结构转变行为的研究.对A_(0.33)B_(0.33)C_(0.34)星型三嵌段共聚物体相结构和纳米球表面属性及空间受限程度对相结构的影响依次给予了计算分析.结果显示,在表面场中性和选择C嵌段两种纳米球受限环境下,随纳米球空间增大,体相结构为六角柱的A_(0.33)B_(0.33)C_(0.34)星型三嵌段共聚物均呈现由各种非球对称性受挫相结构向具有六角柱体相结构特征的相结构演化的转化规律.不同于前2种受限情况,在表面场选择A嵌段和同时选择A及B两嵌段的纳米球受限环境下,在中等大纳米球空间受限区域里,同心球形层结构均有出现.被表面场选择的嵌段润湿或占据纳米球内表面的能力随纳米球空间增大和表面场属性由选择C嵌段变为选择A嵌段变为同时选择A及B两嵌段的顺序均呈现增强趋势,但A_(0.33)B_(0.33)C_(0.34)星型共聚物润湿能力没有在相同受限环境下线型两嵌段的润湿能力强.相比在相同纳米球受限环境下有着对称性相互作用的A_(0.33)B_(0.33)C_(0.34)星型三嵌段共聚物,本研究中的A_(0.33)B_(0.33)C_(0.34)星型共聚物呈现出更多新颖有趣的相结构及转变行为.本研究有助于全面理解星型三嵌段共聚物自组装行为机理,也为解读复杂相结构的形成机理打下理论基础.In this paper,the morphologies and phase behavior of spherically confined A_(0.33)B_(0.33)C_(0.34) star triblock copolymers with a pair of very weak interaction parameters between A and B blocks are studied by using continuous self-consistent field theory.In this study,the bulk phase structure of A_(0.33)B_(0.33)C_(0.34) star triblock copolymer melts and the influence of the surface property and confinement dimension of the confining nanosphere on the phase structure of the confined copolymers are calculated and analyzed,respectively.The results show that as the confinement dimension of nanospheres increases,the morphologies of hexagonally packed cylinder-forming A_(0.33)B_(0.33)C_(0.34) star triblock copolymers under spherical confinement with a neutral surface or the surface preference/selectivity for C blocks evolve from various frustrated phase structures to the confined phase structures with a similar structural characteristic to its bulk phase structure.Different from the previous two surface field cases,concentrically spherical layer structures appear in nanospheres of the medium confinement dimension where the nanosphere surface field has a preference for block A or for both A and B blocks.The ability of the segments liked by the surface field to occupy or wet the inner surface of the nanosphere is enhanced with increasing confinement dimension of nanospheres or the changing sequence of the surface field properties from preference for block C to selectivity for block A to preference for both A and B blocks.However,the wetting ability of A_(0.33)B_(0.33)C_(0.34) star triblock copolymers is weaker than that of linear diblock copolymers under the same confinement environment.Compared with the traditional A_(0.33)B_(0.33)C_(0.34) star triblock copolymers with symmetric interactions under the same nanosphere confinement,the A_(0.33)B_(0.33)C_(0.34) star triblock copolymers in this paper show a more complex and interesting phase behavior.This study in this paper has successfully been realized to extend the prev

关 键 词：ABC星型三嵌段 球受限 受挫相结构 表面选择性 空间受挫程度 

分 类 号：TQ317[化学工程—高聚物工业] TB383.1[一般工业技术—材料科学与工程]