Recent developments in sonochemical polymerisation

G J Price

doi:10.1016/s1350-4177(02)00156-6

Recent developments in sonochemical polymerisation

G J Price

Department of Chemistry

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Abstract

High intensity ultrasound has been applied to two classes of step-growth polymerisation. The ring-opening polymerisation of cyclic lactones to polyesters was accelerated under 20 kHz ultrasound but, in the case of 8-valerolactone, sonication also promoted a depolymerisation reaction so that the molecular weight fell during later stages of the reaction. Sonication was also applied to the preparation of polyurethanes from a number of diisocyanates and diols. In all cases, the sonochemical reactions proceeded faster in the early stages and led to higher molecular weight polymers. The effect of changing the ultrasound intensity is discussed and some speculation as to the mechanisms of the reaction enhancements is given. (C) 2002 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	277-283
Number of pages	7
Journal	Ultrasonics Sonochemistry
Volume	10
Issue number	4-5
DOIs	https://doi.org/10.1016/s1350-4177(02)00156-6
Publication status	Published - 2003

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ID number: ISI:000183783700017

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10.1016/s1350-4177(02)00156-6

DRAFT 80 Recent Developments in Sonochemical Polymerisation
NOTICE: this is the author’s version of a work that was accepted for publication in Ultrasonics Sonochemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Ultrasonics Sonochemistry, 10(4-5), 2003, http://dx.doi.org/10.1016/s1350-4177(02)00156-6
Accepted author manuscript, 134 KB

Cite this

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AB - High intensity ultrasound has been applied to two classes of step-growth polymerisation. The ring-opening polymerisation of cyclic lactones to polyesters was accelerated under 20 kHz ultrasound but, in the case of 8-valerolactone, sonication also promoted a depolymerisation reaction so that the molecular weight fell during later stages of the reaction. Sonication was also applied to the preparation of polyurethanes from a number of diisocyanates and diols. In all cases, the sonochemical reactions proceeded faster in the early stages and led to higher molecular weight polymers. The effect of changing the ultrasound intensity is discussed and some speculation as to the mechanisms of the reaction enhancements is given. (C) 2002 Elsevier Science B.V. All rights reserved.

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JF - Ultrasonics Sonochemistry

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Recent developments in sonochemical polymerisation

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