Abstract
Creep behavior of cylindrical poly(N-isopropylacrylamide) hydrogels in the collapsed state has been investigated. When an elongational stress is applied to the collapsed gels in water, the length of the gels increases and the diameter decreases toward the new equilibrium values. When the stress is removed, the gel recovers the original state through the reverse process. The creep behavior of the collapsed gels is in contrast to the prominent further swelling behavior (i.e., increase in both length and diameter) of the same gels in the swollen state under a constant stress. The similar measurements under constant strains reveal that the collapsed gels undergo a small but definite stress-induced increase in volume. Under sinusoidal stress, the amplitude of the displacement decreases and the phase lag increases as angular frequency increases. The static data agree with the static response estimated from the dynamic data.
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Nosaka, S., Urayama, K. & Takigawa, T. Creep Behavior of Poly(N-isopropylacrylamide) Gels in the Collapsed State. Polym J 38, 970–975 (2006). https://doi.org/10.1295/polymj.PJ2006006
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DOI: https://doi.org/10.1295/polymj.PJ2006006