Abstract
The applicability of the Clapeyron equation to the polymer gel system is demonstrated. It is shown that the stress dependence curve of the transition temperature of the gels undergoing the volume phase transition can be regarded as a phase boundary between swollen and collapsed phases. The enthalpy change at the volume phase transition is estimated from the Clapeyron equation for a poly(N-isopropylacrylamide) (PNIPA) based polymer gel. The transition enthalpy obtained by differential scanning calorimetry (DSC) measurements is estimated for a PNIPA based polymer gel and is compared with that obtained by the Clapeyron equation. It is shown that the transition enthalpy associated purely with the volume phase transition cannot be estimated by DSC while the Clapeyron equation gives the enthalpy change for the volume phase transition.
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References
M. Shibayama and T. Tanaka, Adv. Polym. Sci., 109, 1 (1993).
S. Hirotsu, Y. Hirokawa, and T. Tanaka, J. Chem. Phys., 87, 1392 (1987).
S. Hirotsu and A. Onuki, J. Phys. Soc. Jpn., 58, 1508 (1989).
A. Suzuki, K. Sanda, and Y. Omori, J. Chem. Phys., 107, 5179 (1997).
See, for example, articles in Adv. Polym. Sci., 109, 110, (1993).
Y. Li and T. Tanaka, J. Chem. Phys., 90, 5161 (1989).
M. Shibayama, M. Morimoto, and S. Nomura, Macromolecules, 27, 5060 (1994).
M. Shibayama, S. Mizutani, and S. Nomura, Macromolecules, 29, 2019 (1996).
N. V. Grinberg, A. S. Dubovik, V. Ya. Grinberg, D. V. Kuznetsov, E. E. Makhaeva, A. Yu. Grosberg, and T. Tanaka, Macromolecules, 32, 1471 (1999).
T. Takigawa, H. Araki, K. Takahashi, and T. Masuda, J. Chem. Phys., 113, 7640 (2000).
T. Takigawa, T. Yamawaki, K. Takahashi, and T. Masuda, Polym. J., 31, 595 (1999).
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Takigawa, T., Takahashi, K., Araki, H. et al. Transition Enthalpy for a Poly(N-isopropylacrylamide) Based Polymer Gel Estimated from the Clapeyron Equation. Polym J 33, 297–300 (2001). https://doi.org/10.1295/polymj.33.297
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DOI: https://doi.org/10.1295/polymj.33.297
