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

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  • Special Topic Aggregated-Induced Emission
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Abstract

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.

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Authors and Affiliations

  1. MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Shuang Zhang, JiMing Yan, AnJun Qin, JingZhi Sun & Ben Zhong Tang

  2. Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong, China

    Ben Zhong Tang

Authors
  1. Shuang Zhang
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  2. JiMing Yan
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  3. AnJun Qin
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  4. JingZhi Sun
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  5. Ben Zhong Tang
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Corresponding authors

Correspondence to JingZhi Sun or Ben Zhong Tang.

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Zhang, S., Yan, J., Qin, A. et al. Probing the pH-dependent chain dynamics of poly(acrylate acid) in concentrated solution by using a cationic AIE fluorophore. Sci. China Chem. 56, 1253–1257 (2013). https://doi.org/10.1007/s11426-013-4932-7

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  • DOI: https://doi.org/10.1007/s11426-013-4932-7

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