华南理工大学学报(自然科学版) ›› 2012, Vol. 40 ›› Issue (7): 123-127,154.

• 材料科学与技术 • 上一篇    下一篇

芘荧光探针跟踪纳米复合水凝胶的形成过程

王涛1,2 郑树典1 刘新星1 付时雨2 童真1†   

  1. 1.华南理工大学 材料科学研究所∥发光材料与器件国家重点实验室,广东 广州 510640;2.华南理工大学 轻工与食品学院∥制浆造纸工程国家重点实验室,广东 广州 510640
  • 收稿日期:2012-03-09 修回日期:2012-05-02 出版日期:2012-07-25 发布日期:2012-06-01
  • 通信作者: 童真(1956-) ,男,教授,博士生导师,主要从事功能高分子材料研究. E-mail: mcztong@scut. edu. cn E-mail:fetwang@ scut.edu.cn
  • 作者简介:王涛(1983-) ,男,博士,主要从事高性能水凝胶的制备、力学行为及生物医用研究.
  • 基金资助:

    国家自然科学基金资助项目( 51173052) ; 华南理工大学中央高校基本科研业务费专项资金资助项目( 2012ZB0021) ;广东省高性能与功能高分子材料重点实验室开放基金资助项目( 20100002)

Monitoring of Formation Process of Nanocomposite Hydrogels with Pyrene Fluorescence Probe

Wang Tao1,2  Zheng Shu-dianLiu Xin-xingFu Shi-yuTong Zhen1   

  1. 1.  Research Institute of Materials Science∥State Key Laboratory of Luminescent Materials and Devices,South China University of Technology, Guangzhou 510640,Guangdong,China; 2. School of Light Industry and Food Sciences∥State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2012-03-09 Revised:2012-05-02 Online:2012-07-25 Published:2012-06-01
  • Contact: 童真(1956-) ,男,教授,博士生导师,主要从事功能高分子材料研究. E-mail: mcztong@scut.edu.cn E-mail:fetwang@ scut.edu.cn
  • About author:王涛(1983-) ,男,博士,主要从事高性能水凝胶的制备、力学行为及生物医用研究.
  • Supported by:

    国家自然科学基金资助项目( 51173052) ; 华南理工大学中央高校基本科研业务费专项资金资助项目( 2012ZB0021) ;广东省高性能与功能高分子材料重点实验室开放基金资助项目( 20100002)

摘要: 采用阳离子型芘荧光探针芘甲胺基盐酸盐跟踪聚N-异丙基丙烯酰胺( PNIPAm) /锂藻土Laponite 原位聚合制备纳米复合水凝胶的过程.首先通过提高Laponite 分散液的离子强度,采用离心分离和紫外-可见光吸收光谱验证了荧光探针在Laponite 片层上的吸附; 然后通过跟踪吸附荧光探针的激基缔合物的荧光光谱,发现反应液在聚合反应开始20min 后出现的乳白色不透明现象与体系中形成的PNIPAm 链的不均匀分布相关.聚合生成的高分子链吸附在Laponite 片层周围,占据了片层上一定的空间,使得吸附在Laponite 片层上的荧光分子被挤压而靠近,造成荧光激基缔合物的出现,因此可以通过荧光光谱变化来推测纳米复合( NC) 凝胶聚合过程中透光率的变化及生成的聚合物链与交联剂Laponite 之间的相互作用,这为深入认识NC 凝胶的交联结构提供了一种实验方法.

关键词: 锂藻土, 纳米复合水凝胶, 荧光, 凝胶化

Abstract:

Cationic pyrene fluorescence probe 1-pyrenemethylamine hydrochloride ( PyMA·HCl) was used to monitor the gelation of poly( N-isopropylacrylamide) ( PNIPAm) /hectorite Laponite nanocomposite hydrogel via the insitu polymerization. First,the adsorption of PyMA·HCl on Laponite platelets was verified with UV-Vis spectra after aggregation and centrifuge by increasing the ionic strength of Laponite suspension. The results of fluorescence
emission of excimer show that the milky nontransparent drops appear after a 20min polymerization are related to the heterogeneous distribution of synthesized PNIPAm chains. Moreover,it is found that,as polymer chains are adsorbed around Laponite platelets and occupy part of platelet space,which shortens the distance between the fluorescence probes on Laponite platelets and results in the formation of the excimer,both the change of transmittance during the polymerization and the interaction between polymer chains and Laponite platelets can be determined according
to fluorescence spectra. This finding provides an effective method to explore the crosslinking structure of nanocomposite hydrogels.

Key words: hectorite, nanocomposite hydrogel, fluorescence, gelation

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