PROPERTIES OF SWELLING AND SHRINKING OF POLY (ACRYLAMIDE-co-ACRYLIC ACID) GELS BY INFINITESIMAL CHANGES IN EXTERNAL CONDITIONS

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

MURASE MATSUHIKO¹  NARUOKA HIROHITO¹  NAKANO YOSHIO¹ 

[1]Department of Chemical Engineering, Faculty of Engineering, Shizuoka University

关键词: Copolymer Gel;    Infinitesimal Change;    Swelling;    Equilibrium;    Kinetics;   

DOI  :  10.1252/jcej.19.274

来源: Maruzen Company Ltd

【 摘 要 】

References(10)Cited-By(10)The phase transition of a gel was investigated from the viewpoint of both equilibrium and kinetics. Poly(acrylamide-co-acrylic acid) gels synthesized in our laboratory showed drastic changes in volume by infinitesimal change in concentration of acetone-water mixtures. Such phenomena took place near a critical concentration of the solvent. The equilibrium degree of phase transition of the gel was analysed, using the mean field theory proposed by Flory-Huggins. It was found that the volume change was mainly represented by the f-value defined in the Flory-Huggins formula. The diffusivity of the gel network was estimated from the concentration swing experiment near the phase transition and the equation of motion of gel network. The diffusivities, D, were correlated well with the f-values, as D=exp(0.486f-13.9) for the synthesized copolymer gels.

【 授权许可】

Unknown