物理化学学报 >> 2013, Vol. 29 >> Issue (02): 341-345.doi: 10.3866/PKU.WHXB201211262

软物质 上一篇    下一篇

盐对刷型两亲聚合物聚集行为的调控作用

吴旭1, 蔡晓新1, 王金本2, 杨惠2, 史学峰2   

  1. 1 广州大学化学化工学院, 广州 510006;
    2 中国科学院化学研究所, 胶体、界面与化学热力学重点实验室, 北京 100190
  • 收稿日期:2012-09-17 修回日期:2012-11-26 发布日期:2013-01-14
  • 通讯作者: 吴旭 E-mail:xuwu1999@hotmail.com
  • 基金资助:

    国家级大学生创新训练计划项目资助

Salt Effect on Controlling Aggregation Behavior of Brush-Like Amphiphilic Polymers

WU Xu1, CAI Xiao-Xin1, WANG Jin-Ben2, YANG Hui2, SHI Xue-Feng2   

  1. 1 College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China;
    2 Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2012-09-17 Revised:2012-11-26 Published:2013-01-14
  • Supported by:

    The project was supported by the National Students' Innovation and Entrepreneurship Training Program.

摘要:

两亲聚合物奇异的功能特性源于分子独特的骨架结构和在溶液中的自组装聚集行为. 本文向以2-丙烯酰胺基-十二烷基磺酸(AMC12S)与2-丙烯酰胺基-2-甲基丙磺酸(AMPS)进行无规共聚所制备的AMPS-AMC12S刷型两亲聚合物溶液体系中引入不同用量的NaCl, 采用稳态荧光、动态光散射(DLS)和透射电子显微镜(TEM)系统考察NaCl 对聚合物聚集行为的调控作用. 研究发现, 聚合物结构中疏水侧链含量越低, NaCl 对聚集行为的调控作用越强; NaCl浓度增加会明显降低聚合物的临界聚集浓度; 与此同时, 聚合物分子链自组装由分子间的聚集方式向分子内的聚集方式转变, 形成的聚集形态由大型多分子聚集体变化为尺寸数百分之一的单聚体.

关键词: 聚集行为, NaCl, 聚集体, 刷型聚合物, 调控

Abstract:

The extraordinary properties of amphiphilic polymers originate from their unique skeleton structures and the aggregation behavior of the polymer chains. In the present work, we introduced different amounts of NaCl into AMPS-AMC12S brush-like amphiphilic polymers synthesized via the statistical polymerization of 2-(acrylamido)-dodecanesulfonic acid (AMC12S) with 2-(acrylamido)-2-methylpropanesulfonic acid (AMPS), and investigated the effects of the NaCl on the aggregation behavior of the polymers, using steady-state fluorescence, dynamic light scattering, and transmission electron microscopy. The results showed that the effects of the salt were more intense for polymers with fewer side chains. As the NaCl concentration increased, the polymer chains associated at a lower critical concentration. The polymers tended to aggregate in an intrapolymer configuration, in preference to an interpolymer configuration; this resulted in the formation of smaller unimers, rather than giant multipolymer aggregates. The results described here provide an efficient approach for controlling the aggregation behavior of amphiphilic polymers, and have significance in advancing the design and control of functional aqueous systems, as well as in promoting the development and application of novel polymers.

Key words: Aggregation behavior, NaCl, Aggregate, Brush-like polymer, Control

MSC2000: 

  • O648