Butyl Acrylate/Vinyl Acetate Copolymer Latex Synthesis Using Ultrasound As an Initiator

Journal of Colloid and Interface Science
G CooperS Biggs

Abstract

The polymerization of oil-in-water (o/w) emulsions of monomeric species has been performed at 30°C (±5°C) under ultrasonic irradiation, in the absence of any added chemical initiators. Emulsions of butyl acrylate and vinyl acetate as well as emulsified mixtures of the two monomers have been reacted in this way. In all cases, the radicals formed as a result of the ultrasonic cavitation were sufficient to cause polymerization. Stable blue-white or white dispersions of polymer latex particles were obtained. The kinetics of the copolymerization process were monitored. The data obtained here show that the polymerization rate depends strongly upon the monomer concentration dissolved in the aqueous phase and on its vapor pressure. The more volatile of the monomers examined, vinyl acetate, was seen to have a markedly lower polymerization rate at equivalent monomer concentrations when compared to the butyl acrylate. This was attributed to monomer evaporation into the cavities formed by the ultrasound, causing a dampening of the cavitation process and hence a lower radical density. Data of particle sizes and polymer molecular weights for the latex samples support this hypothesis.

Citations

Sep 19, 2009·Ultrasonics Sonochemistry·Peter CassTim Hughes
Jun 5, 2007·Ultrasonics Sonochemistry·Daisuke KobayashiChiaki Kuroda
Jul 3, 2007·Ultrasonics Sonochemistry·Yuanyuan ZhengGuangqin Pan
Aug 24, 2017·Angewandte Chemie·Thomas G McKenzieGreg G Qiao
Feb 2, 2019·Chemistry : a European Journal·Thomas G McKenzieGreg G Qiao
Jan 14, 2011·Physical Chemistry Chemical Physics : PCCP·Boon M TeoFranz Grieser
Feb 23, 2020·Chemical Reviews·Yin-Ning ZhouZheng-Hong Luo
Mar 21, 2020·ACS Applied Materials & Interfaces·Qiang ZhangH Jerry Qi
Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Keiji KamogawaMasahiko Abe

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