嵌段共聚物受限于软孔内的自组装

利用自洽场方法研究两嵌段共聚物受限于接枝均聚物链(聚合物刷)圆孔中的自组装相形貌.研究表明，当圆孔内径一定时，嵌段比f和聚合物刷C的体积分数φ_C是调控嵌段共聚物相形貌的主要因素，聚合物刷的弹性熵也起着重要作用.当f＝0.7时，在聚合物刷的浸润下，贴近刷表面处AB嵌段共聚物构成环层状结构，随着φ_C的减小这种结构会周而复始地出现.当f处于0. 关键词： 嵌段共聚物 圆孔受限 聚合物刷 自洽场

Phase diagram of diblock copolymer confined in a cylindrical nanopore with polymer-grafted surface

Using self-consistent field calculation, the new equilibrium morphology of a diblock copolymer melt confined in a brush_covered cylindrical nanopore can be found. The morphology is formed as a function of brush density and A-monomer fraction f. When f=0.7, due to the wetting effect produced by polymer brush the outside concentric lamellar ring will come up again with increasing φ_AB. We carefully examined the intermediate phases and discovered a rich variety of new two_dimensional structures that have no analogue in the unconfined system, which include nonhexagonally coordinated cylinder phases and structures intermediate between lamellae and cylinders, like CRCR, when f=0.35. Then we map the stability regions and phase boundaries for all the structures we found.