VISCOELASTIC AND SAXS INVESTIGATION OF FRACTAL STRUCTURE NEAR THE GEL POINT IN ALGINATE AQUEOUS SYSTEMS

被引：50

作者：

MATSUMOTO, T ^{[1
]}

KAWAI, M ^{[1
]}

MASUDA, T ^{[1
]}

机构：

[1] KYOTO UNIV, DEPT BIOMED ENGN, KYOTO 606, JAPAN

来源：

MACROMOLECULES | 1992年 / 25卷 / 20期

关键词：

D O I：

10.1021/ma00046a047

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The sol-gel transition and the fractal structure of the gel have been studied for aqueous systems of alginates with different mannuronate/guluronate (M/G) ratios using viscoelastic and small-angle X-ray scattering (SAXS) measurements. The power law for the dynamic moduli, G' (omega) approximately G" (omega) approximately omega(n), can be applied near the gel point, and the viscoelastic exponent n depends on the concentration and the M/G ratio of the alginate. The fractal dimension d(f) can be obtained from the SAXS data. The value of d(f) also depends on the concentration and the M/G ratio. The d(f) in the G component-rich system is larger than that in the M component-rich system. That is, the gel structure in the former is denser than that in the latter. The relation between n and d(f) is discussed in comparison with the theoretical consideration.

引用

页码：5430 / 5433

页数：4

共 30 条

[1]

[Anonymous], 1989, POLYM HDB

[2]

[Anonymous], 1979, SCALING CONCEPTS POL

[3] INFLUENCE OF COUNTER-ION FIXATION ON MOLECULAR WEIGHT AND SHAPE OF A POLYELECTROLYTE [J].