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- W2313284469 abstract "As a molecular model of the longitudinal wave relaxation at MHz range for a polymer solution, Miyahara et al. proposed the crankshaft model with single thermal relaxation. Ludlow et al. reported the model with double motions in polymer chain, regarding it as a double relaxation. Recently, Ikeda et al. reported that the MHz range compressibility of PMA in acetone solution was abnormal and the compressibility of high molecular weight PMA was smaller than that of the low molecular weight PMA when the molecular weight was higher than 1×106. It was suggested that the phenomena were related with the molecular motion during the longitudinal wave relaxation at MHz range for the polymer solution.In this study, the molecular weight dependence of the molecular motion taking place during the longitudinal wave relaxation at MHz range in PMA-acetone solution was determined by the ultrasonic method, Two PMA samples with different molecular weights (B-3, 1×106 and C-3, 56×104) were prepared.The excess absorption of PMA-acetone solution was estimated from the difference between the absorption of polymer solution and that of solvent. The result of C-3 solution was a single relaxation (hypothetical thermal relaxation). The result of B-3 solution was analyzed by the double relaxation theory. The relaxation frequencies obtained were 4MHz and 40MHz. The molecular model of relaxation for C-3 sample was given as the rotational isomer of a head-tail bond in polymer chain (ΔH°=220cal/mol, ΔH_??_=1600cal/mol). The second relaxation at 40MHz for B-3 sample was presumed to be correlated with the spreading of polymer chain, based on the solvent dependence of the relaxation." @default.
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- W2313284469 date "1973-01-01" @default.
- W2313284469 modified "2023-09-26" @default.
- W2313284469 title "Longitudinal Wave Relaxation of PMA-Acetone Solution" @default.
- W2313284469 doi "https://doi.org/10.2472/jsms.22.489" @default.
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