Viscoelastic Properties of Polyvinyl-i-Butyl Ethers at High Frequencies

概要

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Relaxations of longitudinal moduli of polyvinyl-i-butyl ether with low and high molecular weights are investigated in the frequency range from 1 to 20 MHz and the temperature range from -40℃ to +110℃, and are compared with shear data. The reduced curve of bulk modulus, represented by the Lamb spectrum proposed in nonpolymeric supercooled liquids, indicates a relatively narrow distribution of relaxation time, showing essentially molecular weight independence. The reduced curve of shear data for the low molecular weight also follows the Lamb spectrum, while that for the high molecular weight follows the Davidson-Cole spectrum with β=0.16. The limiting shear modulus G_∞ for polyvinyl-i-butyl ethers and other amorphous polymers is compared with Hirai-Eyring theory. A constant value of E_h/(RT)=3.68±0.13 at glass transition temperature is found to hold for all polymers studied except polyvinyl chloride.
社団法人応用物理学会の論文
1973-03-05