In order to achieve monodisperse particles with high content of antibacterial groups covalently bonded on surface, a bicationie viologen, N-hexyl-N-（4-vinylbenzyl）-4,4＇-bipyridinium bromide chloride （HVV） was dev...In order to achieve monodisperse particles with high content of antibacterial groups covalently bonded on surface, a bicationie viologen, N-hexyl-N-（4-vinylbenzyl）-4,4＇-bipyridinium bromide chloride （HVV） was devised as a surfrner in dispersion polymerization of styrene （St） using a mixture of methanol （or ethylene glycol） and water as media. Effects of content of HVV, its addition profile and composition of reaction media on particles size and incorporation of HVV moieties were mainly investigated. The attachment of silver and gold nanoparticles on particle surface under UV irradiation ascertained the surface-bonded HVV segments. SEM, TEM observations and XPS, zata potential measurements indicated that increase of initial HVV contents and addition of HVV （when polymerization had been performed for 3 h） led to grown particles and enhanced immobilization of HVV moieties. Using a mixture of ethylene glycol and water as reaction media, small particles （520-142 nm） with highly attached HVV moieties were prepared. Furthermore, antibacterial efficacy of the resultant particles against S. aureus was assayed, and particles with more HVV moieties anchored on surface demonstrated greater efficiency of antibacterial activity.展开更多
Three new cationic polymerizable surfactants are synthesized by the reaction of alkylmaleic hemiester with glycidyltrimethylammonium chloride. Their structures are confirmed by H-1 NMR, IR and elements analysis. The v...Three new cationic polymerizable surfactants are synthesized by the reaction of alkylmaleic hemiester with glycidyltrimethylammonium chloride. Their structures are confirmed by H-1 NMR, IR and elements analysis. The values of CMC and gamma (CMC) of these surfactants have been measured. One can obtain nearly monodisperse polystyrene latex by emulsion polymerization using the polymerizable surfactant.展开更多
基金supported by the National Natural Science Foundation of China(No.20974008)
文摘In order to achieve monodisperse particles with high content of antibacterial groups covalently bonded on surface, a bicationie viologen, N-hexyl-N-（4-vinylbenzyl）-4,4＇-bipyridinium bromide chloride （HVV） was devised as a surfrner in dispersion polymerization of styrene （St） using a mixture of methanol （or ethylene glycol） and water as media. Effects of content of HVV, its addition profile and composition of reaction media on particles size and incorporation of HVV moieties were mainly investigated. The attachment of silver and gold nanoparticles on particle surface under UV irradiation ascertained the surface-bonded HVV segments. SEM, TEM observations and XPS, zata potential measurements indicated that increase of initial HVV contents and addition of HVV （when polymerization had been performed for 3 h） led to grown particles and enhanced immobilization of HVV moieties. Using a mixture of ethylene glycol and water as reaction media, small particles （520-142 nm） with highly attached HVV moieties were prepared. Furthermore, antibacterial efficacy of the resultant particles against S. aureus was assayed, and particles with more HVV moieties anchored on surface demonstrated greater efficiency of antibacterial activity.
基金the National Natural Sciences Foundation of China (29903006) and National Microgravity Key Laboratory, Chinese Academy of Scie
文摘Three new cationic polymerizable surfactants are synthesized by the reaction of alkylmaleic hemiester with glycidyltrimethylammonium chloride. Their structures are confirmed by H-1 NMR, IR and elements analysis. The values of CMC and gamma (CMC) of these surfactants have been measured. One can obtain nearly monodisperse polystyrene latex by emulsion polymerization using the polymerizable surfactant.
