Ultrasonic degradation studies of polyacrylates. | [Journal of Chemical Society of Pakistan • 2007]

Author(s):

1. Farah Kanwal: Institute of Chemistry, University of the Punjab, Lahore, Pakistan

2. Richard A. Pethrick: Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow, GI IXL, UK

3. Tahir Jamil: Institute of Chemical Engineering, University of the Punjab, Lahore, Pakistan

Abstract:

Ultrasonic degradation studies of poly(methylmethacrylate; PMMA) and poly(butyl methacrylate; PBMA) in solutions are reported. Measurements of the molar mass distribution using gel permeation chromatography indicate very little evidence of degradation for shorter chain PM MA. For the higher molar mass PBMA, a progressive decrease in the number and weight average molar mass was observed. The molar mass distribution progressively narrowed with increase in ultrasonic irradiation time. A decrease in viscosity of PBMA solution was also observed with increasing irradiation time. The results show that there is limiting molar mass below which significant ultrasonic degradation is not possible at the applied frequency of 20 kHz.

Page(s): 433-437

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 29, Issue: 5, Year: 2007

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