MORPHOLOGIES OF ORIENTED ALGINATE GELS CROSS-LINKED WITH VARIOUS DIVALENT METAL-IONS

被引：24

作者：

YOKOYAMA, F ^{[1
]}

ACHIFE, CE ^{[1
]}

TAKAHIRA, K ^{[1
]}

YAMASHITA, Y ^{[1
]}

MONOBE, K ^{[1
]}

KUSANO, F ^{[1
]}

NISHI, K ^{[1
]}

机构：

[1] IND TECHNOL CTR,IFUKU CHO,OKAYAMA 700,JAPAN

来源：

JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS | 1992年 / B31卷 / 04期

关键词：

D O I：

10.1080/00222349208215465

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Optically anisotropic cylinder-shaped alginate gels crosslinked with various divalent metal ions such as Ca, Cu, Zn, and Pb were prepared by the flow-gelation method in which semidilute sodium alginate solution was extruded through a tube into metal nitrate salt solutions. Effects of metal ions on the morphological and structural features of the gels were examined mainly by polarized optical microscopy. The chain orientation was characterized by a planar orientation where the mean chain orientation is primarily parallel to the gel surface and normal to the total flow direction, due to diametric expansion and longitudinal shrinkage on gelation. The degree of chain extension and orientation was shown to increase in the order Pb > Cu > Ca > Zn. Scanning electron microscopy of the gels dried rapidly under vacuum showed that all the metal alginate gels had cylindrically developed sheet strucures. Molar ratios of metal ions bound to alginate chains were estimated, using plasma spectroscopy, to be in the range 0.42-0.45.

引用

页码：463 / 483

页数：21

共 19 条

[1] STRUCTURAL COMPONENTS OF ALGINIC ACID .2. CRYSTALLINE-STRUCTURE OF POLY-ALPHA-L-GULURONIC ACID - RESULTS OF X-RAY-DIFFRACTION AND POLARIZED INFRARED STUDIES [J].