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Theoretical Study of the Phase Behavior of Cylinder-forming ABC Star Triblock Copolymers Under Spherical Confinement
- Acta Polymerica Sinica Vol. 56, Issue 3, Pages: 501-514(2025)
- 作者机构：
盐城工学院数理学院 盐城 224051
- 作者简介：
Wen-juan Qiu, E-mail: phyqwj@ycit.edu.cn
- 基金信息：
DOI：10.11777/j.issn1000-3304.2024.24232
CLC：- CSTR：32057.14.GFZXB.2024.7329
Received：18 September 2024，
Accepted：2024-12-12，
Published Online：23 January 2025，
Published：20 March 2025
- 稿件说明：
移动端阅览
邱文娟, 莫兆文, 邢玉恒. 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. 高分子学报, 2025, 56(3), 501-514
Qiu, W. J.; Mo, Z. W.; Xing, Y. H. Theoretical study of the phase behavior of cylinder-forming ABC star triblock copolymers under spherical confinement. Acta Polymerica Sinica, 2025, 56(3), 501-514
邱文娟, 莫兆文, 邢玉恒. 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. 高分子学报, 2025, 56(3), 501-514 DOI： 10.11777/j.issn1000-3304.2024.24232. CSTR： 32057.14.GFZXB.2024.7329.
Qiu, W. J.; Mo, Z. W.; Xing, Y. H. Theoretical study of the phase behavior of cylinder-forming ABC star triblock copolymers under spherical confinement. Acta Polymerica Sinica, 2025, 56(3), 501-514 DOI： 10.11777/j.issn1000-3304.2024.24232. CSTR： 32057.14.GFZXB.2024.7329.
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.
Abstract
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 previous studies on ABC star triblock copolymers limited by symmetric interactions or three pairs of relatively strong interactions to systems with a pair of very weak or approximately zero interaction. Therefore
this work is helpful to fully understand the self-assembly behavior mechanism of star triblock copolymers. It also lays a theoretical foundation for the interpretation of the forming mechanism of complex phase structure.
关键词
Keywords
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