Swelling Behavior of Polymer Gels with Built-In Anisotropy near the Volume-Phase Transition Point

1999 ◽  
Vol 32 (6) ◽  
pp. 1822-1827 ◽  
Author(s):  
Changjie Wang ◽  
Zhibing Hu ◽  
Yuanye Chen ◽  
Yong Li
Keyword(s):  
Phase Transition ◽  
Transition Point ◽  
Polymer Gels ◽  
Phase Transition Point ◽  
Swelling Behavior ◽  
Volume Phase Transition ◽  
Volume Phase

Swelling behavior of amphoteric gel and the volume phase transition

1992 ◽  
Vol 96 (11) ◽  
pp. 4698-4701 ◽  
Author(s):  
Seiji Katayama ◽  
Akira Myoga ◽  
Yukio Akahori
Keyword(s):  
Phase Transition ◽  
Swelling Behavior ◽  
Volume Phase Transition ◽  
Volume Phase

scholarly journals Volume Phase Transition of Polymer Gels

Kobunshi ◽  
2005 ◽  
Vol 54 (7) ◽  
pp. 462-465 ◽  
Author(s):  
Mitsuhiro SHIBAYAMA
Keyword(s):  
Phase Transition ◽  
Polymer Gels ◽  
Volume Phase Transition ◽  
Volume Phase

scholarly journals Application of a Clapeyron-Type Equation to the Volume Phase Transition of Polymer Gels

Gels ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 25
Author(s):  
Toshikazu Takigawa ◽  
Jun-ichi Horinaka
Keyword(s):  
Phase Transition ◽  
Type Equation ◽  
Polymer Gels ◽  
Coefficient Of Performance ◽  
Volume Phase Transition ◽  
Work Efficiency ◽  
Equilibrium Conditions ◽  
Clapeyron Equation ◽  
Volume Phase ◽  
Transition Enthalpy

The applicability of the Clapeyron equation to the volume phase transition of cylindrical poly(N-isopropylacrylamide)-based gels under external force is reviewed. Firstly, the equilibrium conditions for the gels under tension are shown, and then we demonstrate that the Clapeyron equation can be applied to the volume phase transition of polymer gels to give the transition entropy or the transition enthalpy. The transition enthalpy at the volume phase transition obtained from the Clapeyron equation is compared with that from the calorimetry. A coefficient of performance, or work efficiency, for a gel actuator driven by the volume phase transition is also defined. How the work efficiency depends on applied force is shown based on a simple mechanical model. It is also shown that the force dependence of transition temperature is closely related to the efficiency curve. Experimental results are compared with the theoretical prediction.

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