Crystal growth in syndiotactic poly(vinyl alcohol) hydrogels |
| |
Authors: | S. Matsuzawa Y. Hondo Y. Kawauchi M. Kume K. Yamaura T. Tanigami K. Ogasawara |
| |
Affiliation: | (1) Present address: Faculty of Textile Science and Technology, Shinshu University, Ueda, Japan |
| |
Abstract: | Aqueous solutions of syndiotacticity-rich poly(vinyl alcohol) (s-PVA) form gels easily. The optimum condition of growth of the calcium tartrate crystal formed by diffusing calcium chloride into hydrogels containing tartaric acid was studied with use ofs- PVA of a syndiotacticity of 56 % and a degree of polymerization of 1460. The crystal grew in the gel of the concentrations of 2 % s-PVA and of 0.5 N tartaric acid at pH=4. The relation between the formation of Liesegang rings and shear modulus of a gel was studied by diffusing silver nitrate into gels containing potassium chromate. The distance between rings decreased with increasing shear modulus of a gel in the range from 670 to 7500 dyne/cm2. The Liesegang rings were not formed for the shear modulus gel for 280 and 16200 dyne/cm2. |
| |
Keywords: | Crystal growth syndiotactic poly(vinyl alcohol) hydrogels Liesegang rings diffusion |
本文献已被 SpringerLink 等数据库收录! |