Solvent Effects on Sol-Gel Transition for Polyelectrolyte Solutions

Abstract

Abstract: The coorperation of solute and solvent is taken as gelation condition.The three dimensional percolation of blobs is taken as gelation model.Phase transition of polyelectrolyte solution is then considered as the process of the formation and the percolation of blobs.Together with the gelation of alginate solutions induced by different divalent cations(Cu²⁺,Ca²⁺,Mn²⁺,Co²⁺),the nature of sol-gel transition has been suggested.Critical exponent of relative viscosity near the gelation point was obtained to be in the range of 0.90～1.14,which is in good agreement with the values predicted by percolation based on various models.Effect of the formation of bolbs on the gel point is discussed.In addition that,the correct range of f in the power-law relation of relative viscosity near gelation point,η_rel∝f_e-f)^-k,has been defined.

Key words: Sol-gel transition, Sodium alginate, Viscosity, Solvent effects

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ZHENG Hong-He, ZHANG Qing-Zhi, WANG Jian-Ji, WANG Zheng-Yu, Mikio Konno, Shozaburo Saito. Solvent Effects on Sol-Gel Transition for Polyelectrolyte Solutions[J]. Chem. J. Chinese Universities, 1996, 17(10): 1653.

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Solvent Effects on Sol-Gel Transition for Polyelectrolyte Solutions

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