TY - JOUR
T1 - A new model for the thermally induced volume phase transition of gels
AU - Otake, Katsuto
AU - Inomata, Hiroshi
AU - Konno, Mikio
AU - Saito, Shozaburo
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1989
Y1 - 1989
N2 - A theoretical model that considers hydrophobic interaction is proposed for the thermally induced discontinuous shrinkage of hydrogels. In this model, the free energy of a hydrogel is divided into four parts: the elastic free energy of networks formulated according to the theory which takes the limit of elongation into account, the free energy arising from osmotic pressure of dissociated counterions in the gel, the free energy of interactions except for the hydrophobic interaction represented by a virial-type volume interaction equation, and the free energy of the hydrophobic interaction. By the former three terms, the thermally induced swelling of gels and the effects of aspect ratio of segment are expressed. The incorporation of the fourth hydrophobic interaction term makes it possible to explain the thermally induced shrinkage of gels, and suggests the possibility of an explanation of "convexo"- type volume phase transition by means of the hydrophobic interaction.
AB - A theoretical model that considers hydrophobic interaction is proposed for the thermally induced discontinuous shrinkage of hydrogels. In this model, the free energy of a hydrogel is divided into four parts: the elastic free energy of networks formulated according to the theory which takes the limit of elongation into account, the free energy arising from osmotic pressure of dissociated counterions in the gel, the free energy of interactions except for the hydrophobic interaction represented by a virial-type volume interaction equation, and the free energy of the hydrophobic interaction. By the former three terms, the thermally induced swelling of gels and the effects of aspect ratio of segment are expressed. The incorporation of the fourth hydrophobic interaction term makes it possible to explain the thermally induced shrinkage of gels, and suggests the possibility of an explanation of "convexo"- type volume phase transition by means of the hydrophobic interaction.
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U2 - 10.1063/1.457157
DO - 10.1063/1.457157
M3 - Article
AN - SCOPUS:36549099776
VL - 91
SP - 1345
EP - 1350
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 2
ER -