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Chariya Kaewsaneha,Pramuan Tangboriboonrat,Duangporn Polpanich,Srung Smanmoo 한국고분자학회 2010 Macromolecular Research Vol.18 No.9
Sulphur-prevulcanised skim (SPVS) rubber particles were heterocoagulated on an aggregate of a disinfectant agent (chlorhexidine digluconate; CHD)-poly(methyl acrylate) (PMA) nanocapsules. The CHD-PMA nanocapsule stabilized by lecithin was prepared using the modified nanoprecipitation of PMA from an organic continuous phase onto nanodroplet containing the CHD aqueous solution. Cationic and anionic nanocapsules were produced by separately redispersing the nanocapsules into a water and 0.5% sodium dodecyl sulphate (SDS) aqueous solution, respectively. The largest aggregate, which was obtained from homocoagulation of the CHD-PMA nanocapsules with opposite charges, was selected as a core surrounded with SPVS shell particles. An interpolymer complex between poly(ethylene oxide) (PEO) moieties adsorbed on the aggregate and indigenous surfactant (protein-lipid) and/or SDS on the SPVS particle surface was the driving force for heterocoagulation. Data from the size,zeta potential measurements and TEM images of the heterocoagulated CHD-PMA/SPVS indicated the composite particle containing the CHD-PMA core.
Ibrahim Badr,Hadjira Lahmar,Chariya Kaewsaneha,Salima Saidi-Besbes,Abdelhamid Elaissari 한국고분자학회 2018 Macromolecular Research Vol.26 No.9
Monodispersed poly(methyl methacrylate) (PMMA) nanoparticles were synthesized by combined dispersion and emulsion polymerization, using aqueous alcohol (methanol/water) as the dispersion medium. The influence of the dispersion medium ratio, stabilizer concentration, and initiator type and concentration on the colloidal stability, particle size, size distribution, and %conversion, was investigated. Submicron PMMA particles with a size of approximately 760 nm with a narrow size distribution, high conversion (91%) and good stability throughout the polymerization were obtained using a 50/50 methanol/water ratio, 1wt% 2,2’-azobisisobutyronitrile (based on monomer), and 1wt% polyvinylpyrrolidone (based on medium). With increasing the polarity of the dispersion medium (30/70 methanol/water ratio), the size and conversion of PMMA particles decreased to 345 nm and 72%, respectively.