Preparation and Characterization of Natural Rubber/Poly [Styrene-co-2-(Methacryloyloxy) Ethyl Trimethylammonium Chloride] Nanocomposites by Heterocoagulation

AbstractThe simple technique as heterocoagulation was used to prepare natural rubber (NR) with poly[styrene-co-2- (methacryloyloxy) ethyl trimethylammonium chloride] (P(S-QDM)) nanocomposites (NR/P(S-QDM)). P(S-QDM) particle was prepared by emulsion polymerization at 80°C using azobisisobutylamide dihydrochloride as initiator. Under the alkaline condition, NR latex (NRL) surface represents negative charge deriving from protein adsorbed on its surface while strong positive charge of P(S-QDM) surface deriving from QDM structure is obtained. The assembly via electrostatic interaction between NRL and P(S-QDM) particles in the emulsion state is then taken place with pH adjustable from 2 to 8. The particle surface, particle size and charge of the polymer nanocomposites were measured by scanning electron microscope, dynamic light scattering and zeta potential, respectively, to compare those with the original NR properties

Preparation of Poly (methyl methacrylate) Microcapsule with Encapsulated Jasmine Oil

AbstractThe microencapsulation of jasmine oil with polymethyl methacrylate (PMMA) was carried out by solvent evaporation method in oil in water (O/W) emulsion system. The oil phase was formed by the mixing of PMMA, jasmine oil and toluene and then dispersed in polyvinyl alcohol solution as stabilizer. After solvent evaporation, PMMA microcapsules with encapsulated jasmine oil were formed. The influence of weight ratio of PMMA:jasmine oil on the preparation of polymer capsule was studied. It was found that using 1:1 weight ratio of PMMA:jasmine oil, the polymer capsules could not prepared. The increase of PMMA content resulting in the formation of spherical PMMA microcapsules as in the case of 2:1 and 3:1 weight ratios. The amount of encapsulated jasmine oil and the encapsulation efficiency was measured with UV-visible spectroscopy. Approximately 72% encapsulation efficiency was obtained