Microemulsion polymerization of butyl acrylate under ultrasound irradiation

ABSTRACT The microemulsion polymerization (MEP) of butyl acrylate (BA) stabilized by ionic emulsifier and initiated by oil-soluble dibenzoyl peroxide (DBP) or lauroyl peroxide (LPO)

initiators have been studied under conventional (without ultrasound irradiation, CMEP) and ultrasonic (NMEP) conditions. The polymerization rate _vs._ conversion curve of the microemulsion

polymerization of BA initiated by DBP was described by two nonstationary rate intervals. Four nonstationary rate intervals with two rate maxima appear in the microemulsion polymerization of

BA initiated by LPO. The maximal rate of polymerization increases with temperature and the increase is much more pronounced under the conventional conditions. The overall activation energy

is much larger under the conventional conditions (=84 kJ·mol−1) than under the ultrasound (=20 kJ·mol−1) conditions. The exit (desorption) rate constants _k_′des (cm2 s−1) and _k_des (s−1)

(Ugelstadt/O’Tool approach, Nomura model and Gilbert model) as a function of temperature and the initiator type and concentration for the CMEP and NMEP were evaluated. Generally, the _k_′des

(cm2 s−1) slightly increase with increasing the reaction temperature (except for the highest and lowest temperatures estimated by _T_model). The values of _k_des (s−1) and _k_′des (cm2 s−1)

are larger under the ultrasound conditions. The increased degradation of micellar aggregates by ultrasound irradiation is in favour of the desorption of monomeric radicals. SIMILAR CONTENT

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Academy of Sciences, Du´bravska´ cesta 9, Bratislava, 842 36, Slovakia Ignác Capek & Silvia Janícková * Intitute of Chemical Research, ICECHIM, 202 Splaiul Independentei, Bucharest, 6

77208, Romania Dan Donescu * Institute of Microtechnology and Analytics (IMA), University of Kassel, Heinrich-Plett Str. 40, Kassel, D-34132, Germany Yanko Sarov & Ivo W Rangelow Authors

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PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Capek, I., Janícková, S., Donescu, D. _et al._ Microemulsion Polymerization of Butyl Acrylate under Ultrasound

Irradiation. _Polym J_ 38, 264–276 (2006). https://doi.org/10.1295/polymj.38.264 Download citation * Received: 06 October 2005 * Accepted: 28 October 2005 * Published: 15 February 2006 *

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Polymerization * Ultrasound Irradiation * Desorption Constant * Butyl Acrylate