两亲性聚合物刷的合成和溶液自组装

发布时间：2017-12-27 12:40

本文关键词：两亲性聚合物刷的合成和溶液自组装　出处：《高分子学报》2016年09期 　论文类型：期刊论文

【摘要】：结合可控自由基聚合和铜催化的叠氮-炔环加成(Cu AAC)反应,合成了一系列Ab BA型两亲性的聚合物刷.其中A段为亲水性的聚(N,N'-二甲基丙烯酰胺)(PAm);B段为高密度接枝的聚合物刷,其侧链为疏水性的聚苯乙烯(PS).通过核磁氢谱(1H-NMR),凝胶渗透色谱(GPC)表征了聚合物刷的组成及结构,其侧链接枝密度约为100%.研究了亲水链段含量不同的聚合物刷在多种条件下的溶液自组装行为,通过透射电子显微镜(TEM)表征了组装体的形貌.在相同的组装条件下,两亲性聚合物刷中亲水链段含量较高时(5%),组装体形貌为球形,而随着亲水链段含量降低,形貌向片层状胶束和囊泡转变.对聚合物刷PAm195-b-(PA-g-PS67)153-b-PAm195的自组装研究表明,提高初始浓度促使组装体形貌向片层和囊泡转变;采用与PS的溶度参数相近的良溶剂,可提高胶束核的活动性,组装体更容易形成囊泡(热力学稳定态);而采用与PS的溶度参数相差大的选择性溶剂时,组装体倾向于聚集形成大尺寸的囊泡.
[Abstract]:Combined with the controlled radical polymerization and copper catalyzed azide alkyne cycloaddition reaction (Cu AAC), a series of Ab type polymer brush BA two amphipathic were synthesized. The A segment is a hydrophilic poly (N, N'- two methyl acrylamide) (PAm); B high density of grafted polymer the brush, the side chain hydrophobic polystyrene (PS). By 1H NMR (1H-NMR), gel permeation chromatography (GPC) to characterize the composition and structure of polymer brushes, the grafted density is about 100%. of the solution of polymer brushes with different content of hydrophilic segments in various conditions, self assembly behavior, by transmission electron microscopy (TEM) characterization of the morphology of assembly. In the assembly of the same conditions, the two amphiphilic polymer brush in higher hydrophilic segment content (5%), the assembly shape is spherical, and with the decrease of hydrophilic segment content, morphology to lamellar micelles and vesicles of change. PAm195-b- (polymer brush PA-g-PS67) show that the self assembly of 153-b-PAm195, improve the initial concentration of the shape to the assembly prompted the lamellae and vesicles with similar change; good solvent and solubility parameter of PS, can improve the activity of the micelles, assembly easier to form vesicles (thermodynamically stable state); the solubility parameter is PS selective solvent at the large assembly tended to form large size vesicles.
【作者单位】：中国科学院化学研究所;中山大学材料科学与工程学院;
【基金】：国家自然科学基金(基金号21374122,51203171)资助项目
【分类号】：O631
【正文快照】： **通讯联系人,E-mail:berry_zw@iccas.ac.cn两亲性聚合物在选择性溶剂中可自组装得到形貌丰富的组装体,如球形、柱形、片层形胶束、复合胶束和囊泡等[1~4],通过调节聚合物的组成和组装条件(如聚合物分子量/嵌段比,自组装溶液的初始浓度,良溶剂/不良溶剂的比例等),可简便控制组

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