Poly (vinyl alcohol) 1788 (PVA) was modified by a cyanuric chloride derivative containing two azobenzene groups through dehydrochlorination reaction between the chlorine atom and the hydroxyl.Infrared spectra and 1H-nmR analysis indicated that azobenzene moiety could be successfully grafted to PVA in the mixture of 1,4-dioxane and deionized water,and about one-twelfth of the hydroxyls in PVA participated in the reaction.The azobenzene-modified PVA can be dissolved in dimethyl sulphoxide and deionized water.Its UV-vis absorption spectrum is similar to that of azobenzene and exhibits typical reversible photoisomerization behaviors.%通过三聚氯氰的氯原子和聚乙烯醇的羟基之间脱氯化氢的反应,用含有2个偶氮苯的三聚氯氰衍生物改性聚乙烯醇(PVA) 1788.红外光谱和核磁共振分析表明,在二氧六环和水混合溶剂中可以将偶氮苯成功接枝到PVA上,PVA中约每12个羟基就有1个发生反应.含有偶氮苯的PVA可以溶解在水和二甲亚砜中.其紫外可见吸收光谱与偶氮苯相似,并表现出偶氮苯的典型光致异构现象.
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