Kinetics analysis of volume phase transition of intelligent neutral thermo-sensitive hydrogels

• 来源期刊: 中国科学G辑(英文版)
• 年，卷（期）: 2008,（5）
• 页码范围: 532-540
• 页数: 9页
• 语种: 英文
• DOI: 10.1007/s11433-008-0031-8

摘要

In this work, utilizing the first law of thermodynamics and the FIory mean-field theory, the kinetic deformation studies concerning the volume phase transition of the neutral thermo-sensitive hydrogels were performed analytically. The hydrogel was assumed as a biphasic mixture medium in the framework of the continuum mixture theory. From the energy conservation of the thermodynamics system of the hydrogel, the governing equations for the kinetics of the nonlinear large deforma-tion were derived. The explicit analytical expressions of the effective stress tensor and the chemical potential of the fluid of the thermo-sensitive hydrogel PNIPA were also obtained from the Helmholtz free energy, which can model the steady-static volume phase transition quantitatively.