在不同基底上的 PS-PEO 中表面功能化富勒烯的选择性自组装。

Selective self-assembly of surface-functionalized fullerenes in PS-PEO on different substrates.

机构信息

State Key Laboratory of Chemical Resource Engineering and College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing, P R China.

出版信息

J Phys Chem B. 2011 Mar 31;115(12):2824-30. doi: 10.1021/jp111115x. Epub 2011 Mar 10.

DOI:10.1021/jp111115x

PMID:21391539

Abstract

Polystyrene-functionalized C60 (C60-PS) was synthesized by atom-transfer radical polymerization. The structure of the hybrid was characterized by gel permeation chromatography and thermal gravimetric analysis. The self-assembly of polystyrene-block-poly(ethylene oxide) (PS-PEO)/C60-PS film in annealing solvents was studied on a silicon wafer and at the air/water interface by transmission electron microscopy. The method is an easy route to produce arrays of ordered nanostructures. The addition of C60-PS has a great effect on the self-assembly of PS-PEO. Treating the film under solvent vapor can modulate the orientation and ordering of PS-PEO microdomains. The C60-PS enhanced the formation of lamellae microstructure, and the C60-PS entered the PS phase, expanding the scale of PS domains. Nevertheless, it becomes more complex when it refers to the self-assembly at the air/water interface under solvent vapor for a long time. The selectivity of solvent to the polymer chains plays an important role as the annealing time increases.

摘要

通过原子转移自由基聚合合成了功能化聚苯乙烯的 C60（C60-PS）。通过凝胶渗透色谱和热重分析对混合物的结构进行了表征。通过透射电子显微镜在硅片和空气/水界面上研究了聚苯乙烯嵌段聚（氧化乙烯）（PS-PEO）/C60-PS 薄膜在退火溶剂中的自组装。该方法是制备有序纳米结构阵列的一种简单途径。C60-PS 的添加对 PS-PEO 的自组装有很大影响。在溶剂蒸气下处理薄膜可以调节 PS-PEO 微区的取向和有序性。C60-PS 增强了片层微结构的形成，并且 C60-PS 进入 PS 相，扩展了 PS 区的尺度。然而，当涉及到在溶剂蒸气下长时间进行的空气/水界面上的自组装时，情况变得更加复杂。随着退火时间的增加，溶剂对聚合物链的选择性起着重要作用。