科研之友
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摘要
The diene-based polymer nanoparticles represented by poly(butadiene-co-acrylonitrile) were prepared in the semi-batch emulsion polymerization system using Gemini surfactant (GS) trimethylene-1,3-bis(dodecyldimethylammonium bromide) as the emulsifier. The nanoparticles within the range of 17-54 nm were achieved with narrow molecular weight and particle size distributions. A spherical morphology was observed for the produced nanoparticles. The effects of GS concentration on the particle size, molecular weight, polymerization conversion and solid content, and composition of copolymer were investigated. The semibatch process using monomeric and conventional surfactant sodium dodecyl sulfate (SDS) was compared. At the second stage of this study, the prepared unsaturated nanoparticles were employed as the substrates for the latex hydrogenation in the presence of Wilkinson's catalyst, that is, RhCl(P(C6H5)(3))(3). The effects of the particle size and catalyst concentration on the latex hydrogenation rate were investigated. The particle size is found to have a significant effect on the reaction rate. When the 17-nm nanoparticles were used as the substrates, a high conversion of 95 mol % was obtained within 18 h using only 0.1 wt % RhCl(P(C6H5)(3))(3). The latex hydrogenation process was completely free of organic solvents. The present synthesis and following "green'' hydrogenation process can be extended to latices made from semibatch emulsion containing other diene-based polymers. This study shows great promise for decreasing the demanded quantity of expensive catalyst and eliminating the organic solvent in the hydrogenation process.
- 出版日期2012-6-1
- 单位苏州大学
