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- W4229885718 abstract "Ultrasonic degradation of methyl cellulose, pullulan, dextran and poly(ethylene oxide) in aqueous solutions was investigated at the frequencies of 20 and 500 kHz, where the ultrasonic power delivered into solutions was kept constant (22 W). The number average molecular mass and the polydispersity were obtained as a function of sonication time. The degradation under sonication at the 500 kHz frequency proceeded faster in comparison with the 20 kHz sonication for four polymers. The addition of a radical scavenger, t-BuOH, resulted in suppression of degradation of water-soluble polymers. The degradation rate constants were estimated from the plot of molecular weight against sonication time. The degradation rate of methyl cellulose was the largest one among the investigated polymers. The difference in the degradation rates was discussed in terms of the flexibility and the hydrodynamic radius of polymer chains in aqueous solutions." @default.
- W4229885718 created "2022-05-11" @default.
- W4229885718 date "1970-04-01" @default.
- W4229885718 modified "2023-09-24" @default.
- W4229885718 title "Principles and applications of effects" @default.
- W4229885718 doi "https://doi.org/10.1016/0041-624x(70)90061-2" @default.
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