Preparation, characterization and novel photoregulated rheological properties of azobenzene functionalized cellulose derivatives and their at-CD complexes
Preparation, characterization and novel photoregulated rheological properties of azobenzene functionalized cellulose derivatives and their at-CD complexes
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DOI：
10.1016/j.polymer.2004.05.072
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发表时间：
2004-08-19
期刊：
影响因子：
4.6
通讯作者：
Gan, LH
中科院分区：
文献类型：
--
作者：
Hu, X;Zheng, PJ;Gan, LH
制备了新型偶氮苯功能化羟丙基甲基纤维素（AZO-HPMC）聚合物及其环糊精配合物。FT-IR， H-1 NMR和FT-Raman光谱证实了偶氮苯在偶氮- hpmc聚合物中的存在。cd可以通过与偶氮苯侧基形成包合物来改善偶氮- hpmc的水溶性。流变学研究证实，AZO-HPMC及其α - cd配合物在水溶液中都经历了热可逆的溶胶-凝胶转变。粘度测量表明，偶氮苯基之间的关联可以通过a-CD消除。光照射对流变性能的影响表明，紫外光照射后AZO-HPMC的胶凝温度升高，而AZO-HPMC/ α - cd配合物的胶凝温度降低。(C) 2004 Elsevier Ltd.版权所有。
Novel azobenzene functionalized hydroxypropyl methylcellulose (AZO-HPMC) polymers and their alpha-CD (alpha-Cyclodextrin) complexes have been prepared. FT-IR, H-1 NMR and FT-Raman spectroscopy confirm the existence of azobenzene chromophores in AZO-HPMC polymers. alpha-CD can improve the water solubility of AZO-HPMC by formation of inclusion complexes with azobenzene side groups. Rheological studies substantiate that both AZO-HPMC and its alpha-CD complex undergo thermoreversible sol-gel transitions, in aqueous solutions. Viscometric measurements suggest that the association between azobenzene side groups can be eliminated by a-CD. The effect of photoirradiation on the rheological behavior shows that the gelation temperature of AZO-HPMC increases after UV irradiation, while the gelation temperature of AZO-HPMC/alpha-CD complex decreases after UV irradiation. (C) 2004 Elsevier Ltd. All rights reserved.