In Situ Cross-Linking of Vesicles in Polymerization-Induced Self-Assembly

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• 作者：Qingwu Qu ; Guangyao Liu ; Xiaoqing Lv ; Baohua Zhang ; Zesheng An
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：March 15, 2016
• 年：2016
• 卷：5
• 期：3
• 页码：316-320
• 全文大小：378K
• ISSN：2161-1653

文摘

In situ cross-linking of nano-objects with controllable morphologies in polymerization-induced self-assembly (PISA) has been a challenge because cross-linking lowers chain mobility and hence inhibits morphology transition. Herein, we propose a novel strategy that allows in situ cross-linking of vesicles in PISA in an aqueous dispersion polymerization formulation. This is realized by utilizing an asymmetric cross-linker bearing two vinyl groups of differing reactivities such that cross-linking is delayed to the late stage of polymerization when morphology transition has completed. Cross-linked vesicles with varying degrees (1–5 mol %) of cross-links were prepared, and their resistance to solvent dissolution and surfactant disruption was investigated. It was found that vesicles with ≥2 mol % cross-links were able to retain their structural integrity and colloidal stability when dispersed in DMF or in the presence of 1% of an anionic surfactant sodium dodecyl sulfate.