Cheng Shuozhen, Wang Jun, Li Chunhui, He Sixian, Liu Yashuang, Wang Yan, Dong Jinfeng, Li Xuefeng
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China.
Chemistry Metrology Division, Hubei Institute of Measurement and Testing Technology, Wuhan 430200, P. R. China.
ACS Omega. 2024 Aug 22;9(35):36917-36925. doi: 10.1021/acsomega.3c09315. eCollection 2024 Sep 3.
In this work, a series of amphiphilic diblock copolymers poly(-2-(methacryloyloxy) ethyl pyrrolidone)--poly(benzyl methacrylate) (PNMP --PBzMA ) were developed by the dispersion polymerization method in ethanol. The polymerization-induced self-assembly (PISA) behaviors were studied systematically, and a comprehensive structure-property relationship was also established. Two distinct PISA tendencies were observed, which was mainly depended on the polymerization degree of PNMP segment. When is small such as 39 and 55, morphological transitions from spherical to vesicle-like assemblies via wormlike ones upon increasing commonly happen regardless of the solid content. Alternatively, spherical assemblies became the sole morphology for PNMP--PBzMA block copolymers because of the excellent solvophilicity of the PNMP segment. Attributing to the amphiphilicity of PNMP --PBzMA block copolymers, PNMP --PBzMA assemblies by PISA are a type of excellent Pickering emulsifiers. These assemblies prefer to stabilize O/W Pickering emulsions as confirmed by the confocal laser scanning microscopy method, and the effects of polymerization degree of PBzMA segment or morphologies of PNMP --PBzMA assemblies are finite.
在本工作中，通过在乙醇中进行分散聚合法制备了一系列两亲性二嵌段共聚物聚（-2-（甲基丙烯酰氧基）乙基吡咯烷酮）-聚（甲基丙烯酸苄酯）（PNMP - PBzMA）。系统研究了聚合诱导自组装（PISA）行为，并建立了全面的结构-性能关系。观察到两种不同的PISA趋势，这主要取决于PNMP链段的聚合度。当较小时，如39和55，无论固含量如何，随着的增加，形态通常会从球形通过蠕虫状组装体转变为囊泡状组装体。或者，由于PNMP链段具有优异的亲溶性，球形组装体成为PNMP - PBzMA嵌段共聚物的唯一形态。由于PNMP - PBzMA嵌段共聚物的两亲性，通过PISA得到的PNMP - PBzMA组装体是一类优异的皮克林乳化剂。共聚焦激光扫描显微镜方法证实，这些组装体倾向于稳定水包油型皮克林乳液，并且PBzMA链段的聚合度或PNMP - PBzMA组装体的形态的影响是有限的。
