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Probing the pH-dependent chain dynamics of poly(acrylate acid) in concentrated solution by using a cationic AIE fluorophore

查看全文 作　　者：ZHANG [1]Shuang;YAN [1]JiMing;QIN [1]AnJun;SUN [1]JingZhi;TANG Ben [1,2]Zhong 高影响力作者 机构地区：[1]MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University;[2]Department of Chemistry,The Hong Kong University of Science & Technology高影响力机构 出　　处：《Science China Chemistry》索引2013年第56卷第9期,共5页高影响力期刊 基　　金：the National Science Foundation of China (21074113);the Key Project of the Natural Science Foundation of Zhejiang Province (Z4110056) 摘　　要：We report a novel strategy to study the chain dynamics of poly(acrylic acid) (PAA) in a relative concentrated solution (1.0 g/L). The strategy is based on the fluorescent probe (DCTPE) with unique aggregation-induced emission (AIE) characteristics. Free DCTPE molecules are non-emissive in aqueous solution, but they become highly emissive when trapped in polymer coils. The fluorescence intensity is proportional to the efficiency of trapping DCTPE molecules in polymer coils. By correlation the change of fluorescence intensity with the variation of pH value (from 1.78 to 12.06), the PAA chain's dynamics in the relatively concentrated solution have been elucidated into three processes. In the pH range from 12.06 to 6.0, PAA chains take an extended and non-folding conformation. Changing pH from 6.0 to 3.86, PAA chains are partially protonated and loosely packed polymer coils are formed. Further lowering the pH value of the solution (from 3.86 to 1.78), protonated segments dominate the PAA chains, and at the same time, the intermolecular hydrogen bonding takes effect, thus the polymer chains posses in the conformation of more compact coils. 关 键 词：pH值 浓溶液 A链 丙烯酸酯 荧光基团 依赖性 探测 聚合物链
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