Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (07): 604-608.doi: 10.3866/PKU.WHXB19960706

• ARTICLE • Previous Articles     Next Articles

Solvent Effects on Sol-gel Transition of Sodium Alginate Solutions

Zheng Hong-He,Zhang Qing-Zhi,Wang Jian-Ji,Wang Zheng-Yu,Mikio konno,Shozaburo Saito   

  1. Department of Chemistry,Henan Normal University,Xinxiang 453002|Department of Molecular Chemistry and Engineering,Faculty of Engineering,Tohoku University,Sendai 980.Japan
  • Received:1995-12-04 Revised:1996-02-02 Published:1996-07-15
  • Contact: Zheng Hong-He

Abstract:

The cooperation of solute and solvent is taker as the gelation condition. The three dimensional percolation of blobs is taken as the gelation model. Phase transition of polyelectrolyte solution is then considered as a process of the formation and the percolation of blobs. By the study of the gelation of different concentration of alginate solutions induced by calcium cation, the nature of sol-gel transition has been suggested. Critical exponent of relative viscosity near the gelation point was determined as κ=0.900.97, A power-law relation was confirmed between the gelation point fc and alginate concentration c. In addition, the correct range of application of the power-law relation of relative viscosity near gelation point, ηrel ∝(fc-f)-k, has also been defined.

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