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Crystal growth in syndiotactic poly(vinyl alcohol) hydrogels (1987)

Matsuzawa, S. ; Hondo, Y. ; Kawauchi, Y. ; [et al.]

Springer

Colloid & polymer science 265 (1987), S. 810-814

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ISSN: 1435-1536

Keywords: Crystal growth ; syndiotactic poly(vinyl alcohol) ; hydrogels ; Liesegang rings ; diffusion

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01418457

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Continuous preparative method of relatively large and uniform polymer beads and their application to immobilization of urease (1988)

Ogawa, N. ; Kawauchi, Y. ; Nishimura, K. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 35 (1988), S. 1283-1288

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ISSN: 0021-8995

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: An apparatus for continuous preparative method of polymer beads was investigated. Monomer droplets formed in glycerol were continuously introduced to a rotating glass tube which was filled with warmed glycerol and polymerized. Polymer beads of around 4 mm diameter were obtained. As an application of the polymer beads, urease was immobilized on the beads and their properties were evaluated. Macroreticular type of beads prepared with a mixture of maleic anhydride, styrene, and divinylbenzene showed the highest enzymatic activity among the beads tested, and the urease immobilized beads could be successfully applied for determination of blood urea nitrogen in human sera.

Additional Material: 3 Ill.