作　　者： ; ; ; ;

机构地区： 华南理工大学材料科学与工程学院材料科学研究所

出　　处： 《高分子学报》 2007年第3期297-300,共4页

摘　　要： The sol-gel transition of aqueous alginate solutions induced by calcium cations has been studied by using dynamic light scattering.A critical relaxation was observed near the gel point,which was characterized by the power law of the time-intensity correlation function g（2）（t）-1∝t-μ.The comparison of this critical exponent μ with the critical exponent n for mechanical relaxation obtained with dynamic rheology measurements shows μ=2n for the Ca-alginate sol-gel transition.The critical exponent μ was found to be proportional to q2,q is the scattering vector,and the proportional coefficient almost equaled to the correlation length of the critical gel. The sol-gel transition of aqueous alginate solutions induced by calcium cations has been studied by using dynamic light scattering. A critical relaxation was observed near the gel point, which was characterized by the power law of the time-intensity correlation function g^（2） （ t ） - 1 ∝t^- μ . The comparison of this critical exponent μ with the critical exponent n for mechanical relaxation obtained with dynamic rheology measurements shows μ = 2 n for the Ca-alginate sol-gel transition. The critical exponent μ was found to be proportional to q^2, q is the scattering vector, and the proportional coefficient almost equaled to the correlation length of the critical gel.

关 键 词： 海藻酸 凝胶化 凝胶化点 临界指数 动态光散射

领　　域： [理学] [理学]