Effects of frequency and a radical scavenger on ultrasonic degradation of water-soluble polymers

Ultrasonics Sonochemistry
Shinobu KodaKazunori Futamura

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.

References

May 3, 2003·Ultrasonics Sonochemistry·Shinobu KodaHideto Mitome
Aug 21, 2003·Ultrasonics Sonochemistry·Mohammad Taghi Taghizadeh, Abbas Mehrdad
Nov 20, 2003·Ultrasonics Sonochemistry·A GrönroosO Ruppert
Sep 17, 2005·Ultrasonics Sonochemistry·U D HarkalM A Shenoy
Sep 19, 2008·Ultrasonics Sonochemistry·M T Taghizadeh, T Asadpour

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Citations

Feb 4, 2014·Ultrasonics Sonochemistry·Limin SongDonglan Sun
Dec 3, 2013·Ultrasonics Sonochemistry·Mohamad Taghi Taghizadeh, Ali Bahadori
Sep 21, 2013·Ultrasonics Sonochemistry·Khuyen Viet Bao TranShinobu Koda
Dec 26, 2015·Ultrasonics Sonochemistry·M Soledad BelluzoM Susana Cortizo
Apr 20, 2016·Journal of Environmental Sciences (China)·He ZhaoRong Cheng
Jul 19, 2015·Ultrasonics Sonochemistry·Parag R Gogate, Amrutlal L Prajapat
Dec 8, 2017·Biotechnology for Biofuels·Kiyota SakaiMasashi Kato
May 17, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Bo ZhuBin Li
Jul 25, 2017·Carbohydrate Polymers·Bahtiyor MuhitdinovAbbaskhan Turaev
Jul 3, 2021·Nanomaterials·Harald KratzJörg Schnorr
Aug 18, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Kristine M Smith, Lilian C Hsiao

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