期刊
MACROMOLECULAR SYMPOSIA
卷 215, 期 -, 页码 179-189出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/masy.200451115
关键词
cationic polymerization; miniemulsion; p-methoxystyrene; rare earth catalyst
The cationic polymerization of p-methoxystyrene using an acid initiator and ytterbium triflate as a cocatalyst was studied in miniemulsion. Conductometry measurements revealed that ytterbium triflate dissociates in water. The high ionic strength implemented by ytterbium cation releasing requires the use of an electrosteric surfactant, i.e. sodium dodecylpolyoxyethylene(8) sulfate, as an efficient stabilizer against particle coalescence. The catalyst increases significantly the polymerization rate but only moderately affects the molar masses. A tentative polymerization scheme is proposed based on these results and several other blank experiments.
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