期刊
COLLOID AND POLYMER SCIENCE
卷 284, 期 2, 页码 142-150出版社
SPRINGER
DOI: 10.1007/s00396-005-1350-1
关键词
radical polymerization; miniemulsion; amphiphilic copolymer; polyelectrolyte; reversible addition-fragmentation chain transfer; nitroxide
Well-defined, positively charged, amphiphilic copolymers containing long alkyl side chains were used as stabilizers in the mini-emulsion 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.
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