Abstract
Conformational relaxation of poly(methyl methacrylate) in the glassy state has been investigated by measuring dynamic viscoelasticity and density. Physical aging at room temperature was investigated for the samples quenched from 190°C. The loss tangent (tanδ) in the range of temperature below the glass transition temperature decreased with aging time, and approached a certain equilibrium curve from lower temperature side. The rate of change was independent of the molecular weight. However, no effect of physical aging was observed for the samples slowly cooled from 190°C. The quenched sample and the aged sample after quenching were annealed at 80 or 110°C to accelerate the relaxation, and then cooled slowly from each temperature. The temperature dispersion curves of the dynamic viscoelastic functions of the samples agreed well with those of quenched samples in higher temperature range than the annealing temperature, and with those of slowly cooled ones in lower temperature range. Densities measured at 30°C were found to explain well the change in segmental conformation due to thermal histories. The effect of thermal history on the viscoelasticity was discussed in terms of the change of segmental conformation of polymeric glasses.
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Araki, O., Yoshizawa, T., Takigawa, T. et al. Conformational Relaxation in Glassy State of Poly(methyl mathacrylate)s Investigated by Viscoelasticity and Density Measurements. Polym J 32, 97–102 (2000). https://doi.org/10.1295/polymj.32.97
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DOI: https://doi.org/10.1295/polymj.32.97