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Chem. J. Chinese Universities ›› 2005, Vol. 26 ›› Issue (4): 787.

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Critical Concentration Effect During the Preparation of Self-assembled PSS/PDDA Multilayer Films

CHEN You-Fang1, QIAN Jin-Wen2, YANG Ping2, LIN Xian-Fu1   

  1. 1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
    2. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2004-11-30 Online:2005-04-10 Published:2005-04-10

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Abstract: UV absorbance(A) of self-assembled films of poly(dimethyldiallyl ammonium chloride)(PDDA) and poly(styrene sulfonate)(PSS) with various concentrations of polyelectrolyte(cP) at different concentrations of sodium chloride was investigated. It was found that the A～cP curves display a discontinuous phenomenon. And the turning point concentration, at which the A～cP curve starts to display a discontinuous phenomenon, is in good agreement with the critical concentration c of PSS or PDDA polyelectrolyte solutions. The results above attribute to the change of chain shape of polyelectrolytes in solutions caused by cP and c(NaCl). Thus, it is inferred that chain shape of polyelectrolyte in solutions affects the thickness of PSS/PDDA multilayer films.

Key words: Self-assembled film, Polyelectrolyte, Polymer concentration, Critical concentration.

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