Article ID Journal Published Year Pages File Type
1266597 Ultrasonics Sonochemistry 2008 6 Pages PDF
Abstract
Without any chemical initiators added, ultrasonically irradiated emulsion copolymerization of styrene and a cationic polymerizable surfactant (methacryloxyethyl dodecydimethyl ammonium bromide, C12N+) was successfully employed to prepare copolymer nanolatexes. Compared with the conventional ionic surfactants, C12N+ has much higher initiation efficiency and C12N+ system exhibits shorter induction period, much higher styrene conversions and polymerization rate Rp in short reaction time. A radical trapping experiment and gas chromatograph-mass spectrograph analysis proved that under ultrasonic irradiation, C12N+ undergoes bond scission between the two alkyl and ionic group, where both C-N bonds are weak along the chain, thereby producing much more original radicals to initiate the emulsion polymerization.
Related Topics
Physical Sciences and Engineering Chemistry Chemistry (General)
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