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The origin of the relaxation phenomena associated with volume deformation in amorphous polymers is attributed to the configurational relaxation of the three‐dimensional extension of the chain molecule. A diffusion equation of chain configuration is formulated with the use of the model of a chain molecule which is composed of beads connected by Hookian springs. A dynamic relation between varying pressure and volume is derived by integration of the diffusion equation for sinusoidal pressure change, and thus the real and imaginary parts of the bulk modulus are calculated. The dispersion of bulk modulus is specified by two characteristic time constants, τβ and τΓ, the former relating to the rubberlike elasticity of a chain, and the latter to the elasticity of the energetic nature which comes from the distorsion of chemical bonds and also from the change of cohesive energy. A preliminary comparison of the theory with experiment is made.
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Osamu Nakada (1960) studied this question.
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