Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (7): 123-127,154.

• Materials Science & Technology • Previous Articles     Next Articles

Monitoring of Formation Process of Nanocomposite Hydrogels with Pyrene Fluorescence Probe

Wang Tao1,2  Zheng Shu-dian1  Liu Xin-xing1  Fu Shi-yu2  Tong 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)

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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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