高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (9): 1805.

• 研究论文 • 上一篇    下一篇

偶氮聚电解质在水性介质中的聚集行为和光响应性研究

庹新林, 吴立峰, 王晓工   

  1. 清华大学材料科学与工程研究院化工系, 北京 100084
  • 收稿日期:2001-07-02 出版日期:2002-09-24 发布日期:2002-09-24
  • 通讯作者: 王晓工(1955年出生),男,博士,教授,主要从事功能性高分子材料研究.E-mail:wxg-dce@mail.tsinghua.edu.cn E-mail:wxg-dce@mail.tsinghua.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:59925309)资助

Aggregation and Photo-responsive Behavior of Azo Polyelectrolytes in Aqueous Media

TUO Xin-Lin, WU Li-Feng, WANG Xiao-Gong    

  1. School of Materials Science and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2001-07-02 Online:2002-09-24 Published:2002-09-24

PDF (PC)

被引次数

5

摘要： 研究了一种侧链型偶氮聚电解质(PPAPE)在水溶液和水/四氢呋喃混合溶液中的缔合及聚集行为.利用紫外光谱检测了缔合体的形成过程.通过测定不同浓度下溶液的表面张力确定PPAPE在水溶液中的临界聚集浓度,并利用透射电镜对PPAPE聚集体直接进行观察.研究表明,PPAPE的疏水性偶氮生色团在适当的条件下会发生缔合,并进一步聚集成具有纳米尺寸的微球.伴随缔合体的形成,PPAPE的紫外最大吸收峰位置明显蓝移,而且这种缔合行为使PPAPE的光色效应明显减弱.尽管溶液pH值对PPAPE的光色效应也有明显的影响,但作用机理有本质的区别.

关键词: 缔合效应, 纳米聚集体, 亲水-疏水性, 偶氮聚电解质

Abstract: The aggregation behavior of a series of side-chain azo polyelectrolytes (PPAPE) was studied in aqueous and tetrahydrofuran(THF)/water mixed media. The aggregate process was traced with UV-Vis absorption spectroscopy. The critical aggregate concentration(CAgC) of PPAPEin aqueous solution was determined by measuring the surface tension values of the related solutions with different concentrations. The self-assembled supermolecular structures were characterized with transmission electron microscopy(TEM). The results show that the azo chromophores tethered to PPAPE H-aggregate under a suitable condition and further aggregate into nanoscale structures. Following with the aggregation process, the(max obviously blue-shifts and the photochromic effect of azo chromophores is significantly weakened. Although the pHof aqueous solutions also have a significant effect on the photochromic effect, however, these two kinds of effects have obviously different mechanisms.

Key words: Aggregation, Nanoscale structures, Hydrophobicity, Azo polyelectrolytes

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