Studies On The Copolymerization Of The Organized Silica And Isoprene

Firstly, the paper investigated that silica was organically modified with 3-(trimethoxysilyl) proplmethacrylate (MPS) coupling agent, the C=C is rich on the surface of modified silica particles which can participate in polymerization, and the condition of the organic modified reaction was studied. The appropriate degree of organic silica which dissolution was amphiphilic was selected by controlling the degree of organic modification.The C=C on the surface of modified silica particles had great different reactivity ratio from isoprene, so design a specific polymerization system:the oxidation-reduction initiator was designed to initiate the emulsion polymerization which occurred in the interface and polymer chains of isoprene graft onto the surface of the organized silica successfully, so that the organized silica-polyisoprene was prepared in the form of inorganic-organic copolymer particles. Also in the studies, the co-polymerization system were studied; the impact on the graft copolymerization of the factors, including the result of the chemical modification of silica, the input of modified silica, the reaction temperature, the emulsifier type, the initiator type and usage, as well as whether to put in the styrene monomer were separately discussed.The copolymer particles was analyzed with the application of Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), energy spectrum analysis (EDS), NMR and thermal gravimetric analysis (TGA). The results show that when the MPS and the silica ratio is 17:100, the degree of organic silica is appropriate, presenting amphiphilic; exist of the organized silica-polyisoprene copolymer particles was proved, and in the optimum condition the mass ratio for SiO2 and polyisoprene in copolymer particles about 100:35.This study make the silica, organic silica, organically modified silica-isoprene copolymer particles into nature rubber, through the performance test, the physical mechanical properties of cross-linked rubber with copolymer particles is better than with silica and organically modified silica.