Ultrasonically initiated emulsion polymerization of n-butyl acrylate

Ultrasonically initiated emulsion polymerization of n‐butyl acrylate (BA) without added initiator has been studied. The experimental results show that high conversion of BA can be reached in a short time by employing an ultrasonic irradiation technique with a high purge rate of N2. The viscosity ave...

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Bibliographic Details
Published in:Polymer international 2001-11, Vol.50 (11), p.1252-1259
Main Authors: Wang, Qi, Xia, Hesheng, Liao, Yongqin, Xu, Xi, Baxter, Steven M, Slone, Robert V, Wu, Shuguang, Swift, Graham, Westmoreland, David G
Format: Article
Language:English
Subjects:
Applied sciences
emulsion polymerization
Exact sciences and technology
n-butyl acrylate
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
ultrasonic irradiation
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Summary:Ultrasonically initiated emulsion polymerization of n‐butyl acrylate (BA) without added initiator has been studied. The experimental results show that high conversion of BA can be reached in a short time by employing an ultrasonic irradiation technique with a high purge rate of N2. The viscosity average molecular weight of poly(n‐butyl acrylate) (PBA) obtained reaches 5.24 × 106 g mol−1. The ultrasonically initiated emulsion polymerization is dynamic and complicated, with polymerization of monomer and degradation of polymer occurring simultaneously. An increase in ultrasound intensity leads to an increase in polymerization rate in the range of cavitation threshold and cavitation peak values. Lower monomer concentration favours enhancement of the polymerization rate. 1H NMR, 13C NMR and FTIR spectroscopies reveal that there are some branches and slight crosslinking, and also carboxyl groups in PBA. Ultrasonically initiated emulsion polymerization offers a new route for the preparation of nanosized latex particles; the particle size of PBA prepared is around 50–200 nm as measured by transmission electron microscopy. © 2001 Society of Chemical Industry
ISSN:0959-8103
1097-0126
DOI:10.1002/pi.773