Modification Of MMT And Preparation Of Polybutadiene/OMMT Nanocompisoties

In this paper a new technology was used to modify the surface of MMT to prepare hydrophobic organic montmorillonite (OMMT), which possessed stable dispersion in nonpolar solvent, by quaternary ammonium salt and coupling agent complex modification. Moreover After complex modification the externally and internally surfaces of OMMT became hydrophobic, which can disperse in cyclohexane uniformly and stabily, and realize polymerization of PB/OMMT nanocomposites (NC) by in situ intercalation polymerization. Meanwhile the paper did a series of experiments and academic research on the structure, performance and the connection between them about the NC.(1) Hydrophobic organic montmorillonite (OMMT), possessed stable dispersion in nonpolar solvent, was prepared by quaternary ammonium salt and coupling agent complex modification. The effects of temperature, reaction time, laying time, dryness time on the preparation were studied to find the fine technical parameters. It has been also found that the two new technologies can shorten the preparation time, comparing with the traditional.The intercalation interlayer structure and configuration of OMMT were characterized by the XRD,TEM and FT-IR. The results show that different quaternary ammonium salt had different affection on the interlayer spacing of OMMT; the interlayer spacing of OMMT increased with increasing length and number of long alkyl chain in quaternary ammonium salt, and when the intercalating agent is docosyl trimethyl ammonium chloride, the layer spacing is 4.9nm; the intercalating agent is trihexadecyl methyl ammonium chloride (3C16-OMMT), the interlayer spacing is 5.07nm. The nanolayers of OMMT array in a definite direction; the layer spacing is about 4-5nm, and the dimension is less than 50nm.sedimentation experiment was used to evaluate the dispersibility of OMMT in cyclohexane; systematical study were performed on the effects of the type and structure of quaternary ammonium salt and the type of coupling agents on the dispersibility of OMMT. 3C16-OMMT after surface modification by different coupling agents didn't change the inherent intercalate structure, and the dispersibility of OMMT in cyclohexane greatly enhanced, especially after surface modification by 4% titanate coupling agent CT-201, the OMMT can disperse stably in cyclohexane at least for 72h.(2) Polymerization of PB/OMMT nanocomposites was prepared by in situ intercalation polymerization. Systematical studies were also performed on the effects of the type and content of OMMT and the technical parameters. The XRD and TEM was engaged to characterized the structure and configuration of the PB/OMMT NC. The results show that removing type ofPB/OMMT NC was prepared after the surface of 3C16-OMMT modified by 4% titanate coupling agent CT-201. The thermal stability of OMMT were investigated by TGA. It was found that the nanostructure improved the performance of PB/OMMT NC greatly.