高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (7): 1320.

• 论文 • 上一篇    下一篇

支化侧链偶氮聚电解质的合成和H-聚集

邓永红, 庹新林, 成昊, 王晓工   

  1. 清华大学材料科学与工程研究院, 化工系高分子研究所, 北京 100084
  • 收稿日期:2002-06-14 出版日期:2003-07-24 发布日期:2003-07-24
  • 通讯作者: 王晓工(1955年出生),男,教授,博士生导师,从事功能高分子研究.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

Synthesis and H-aggregation of a Novel Polyelectrolyte Bearing Branched Azo Side Chains

DENG Yong-Hong, TUO Xin-Lin, CHENG Hao, WANG Xiao-Gong   

  1. Department of Chemical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2002-06-14 Online:2003-07-24 Published:2003-07-24

摘要: 合成了一种新型支化侧链型偶氮聚电解质PMAPB6P-AA.以偶氮生色团为探针,研究了这类聚电解质在混合溶剂中的H-聚集,以及H-聚集对偶氮生色团光响应性能的影响.研究发现,PMAPB6P-AA在水体积分数大于11%的DMF/H2O混合溶剂中形成H-聚集.偶氮苯离域电子的色散力是形成H-聚集的主要动力.与偶氮小分子MAPB6和MAPB6P相比,PMAPB6P-AA表现出更强的H-聚集能力,表明疏水作用和聚合物链的束缚作用等也是影响偶氮苯基团H-聚集能力的重要因素.H-聚集对PMAPB6P-AA光响应影响的明显特征是光响应速率减慢和光致顺反异构的效率降低.

关键词: 支化侧链, 偶氮聚电解质, 混合溶剂, H-聚集, 光响应

Abstract: A novel polyelectrolyte bearing branched azo side chains, MAPB6P-AA, was synthesized and characterized. H-aggregation of the azo chromophores of MAPB6P-AA in N,N-dimethylformamide(DMF)/H2O mixed solvent was studied by UV-Vis spectroscopy. The experimental results show that the critical volume fraction for MAPB6P-AA to form H-aggregates in the mixture of DMF and H2O is 11%. It is van der Waals force associated with the delocalized electrons of azobenzene chromophores that provides a driving force for the aggregation. Compared with low-molecular-weight azo molecules such as MAPB6 and MAPB6P, polymer MAPB6P-AA has a stronger aggregation tendency, which suggests that hydrophobic interaction and polymeric linkages also play a significant role in the formation of H-aggregation. In addition, the influence of H-aggregation of the azo chromophores on their photoresponsive behavior was also studied. A significant decrease of the trans-to-cis isomerization rate and the cis isomer content at photo-stationary state was observed.

Key words: Branched side chains, Azo polyelectrolyte, Mixed solvent, H-aggregation, Photoresponsive behavior

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