Kinetics of polymerization of styrene-in-water microemulsions |
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Authors: | N Girard Th F Tadros A I Bailey |
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Institution: | (1) Zeneca Agrochemicals Jealott's Hill Research Station Bracknell, Berkshire RG12 6EY, UK, GB;(2) Department of Chemical Engineering Imperial College Prince Consort Road London SW7 2BY, UK, GB |
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Abstract: | The kinetics of polymerization of styrene-in-water microemulsions was investigated using dilatometry. From plots of percentage
conversion versus time, the rate of polymerization, R
p, was determined. From log-log plots of R
p versus styrene and initiator 2,2′-azobis(isobutyronitrile), AIBN] concentrations the following relationship was established:
R
p∝ styrene]1.2 AIBN]0.46. These exponents are similar to those predicted by the theory of emulsion polymerization. The results also showed a rapid
conversion in the initial period (interval 1) followed by a slower rate at longer times (interval 2). It was suggested that
in interval 1, the main process in nucleation of the microemulsion droplets, whereas in interval 2 propagation is the more
dominant factor. The rapid polymerization of microemulsions is consistent with their structure, whereby very small droplets
with flexible interfaces are produced.
Received: 2 March 1999 Accepted in revised form: 10 May 1999 |
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Keywords: | Polymerization Microlatex Kinetics of polymerization |
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