Miniemulsion polymerization of styrene using well-defined cationic amphiphilic comblike copolymers as the sole stabilizer

M. Manguian , M. Save (1) , C. Chassenieux (2) , B. Charleux (3)

1 IPREM - Institut pluridisciplinaire de recherche sur l'environnement et les matériaux
2 PPMD - Laboratoire de Physico-Chimie des Polymères et des Milieux Dispersés
3 LCP - Chimie des polymères

Well-defined, positively charged, amphiphilic copolymers containing long alkyl side chains were used as stabilizers in the miniemulsion polymerization of styrene. The copolymers were prepared by controlled free-radical copolymerization of styrene and vinyl benzyl chloride using either the reversible addition-fragmentation chain transfer method or TEMPO-mediated polymerization. The benzyl chloride moities were modified by two different long alkyl chain tertiary amines (N, N-dimethyldodecyl amine and N, N-dimethylhexadecyl amine) to yield the amphiphilic copolymers with vinylbenzyl dimethyl alkyl ammonium chloride units. Owing to their high structural quality, only a small amount of these copolymers was required to stabilize the latex particles (0.5-2 wt% vs styrene). Moreover, in the absence of any hydrophobic agent, the amphiphilic comblike copolymer preserved the colloidal stability of both the initial liquid miniemulsion and the final latex. Ill-defined, analogous copolymers were synthesized by conventional free-radical polymerization and in comparison, exhibited poor stabilization properties. © Springer-Verlag 2005.

Domaines: Polymères

M. Manguian, M. Save, C. Chassenieux, B. Charleux. Miniemulsion polymerization of styrene using well-defined cationic amphiphilic comblike copolymers as the sole stabilizer. Colloid and Polymer Science, 2005, 284 (2), pp.142-150. ⟨10.1007/s00396-005-1350-1⟩. ⟨hal-01563819⟩