The butyl rubber was synthesized by the solution polymerization method, with H2O/EADC as initiator system, hexane and chloride methane as solvent, at -90 ℃. The effects of the initiator concentration, ratio and the third component (DMF) on butyl rubber properties were examined. The results show that optimum condition is initiator concentration 0.085%,polymerization 40 min,n(EADC)/n(H ₂O)/n(DMF) is 8.28∶1∶0.75, butyl rubber of which molecular weight is 29.54×10 ⁴ g/mol,MWD is 1.58.

The thermal stability of bromobutyl rubber were studied by capillary rheometer which was similar to extruser in industrial production. Firstly,regular bromobutyl rubber were polymerized by solution method.The results show that in constant temperature（at 150 ℃ or 180 ℃）conditions,the bromine content and microstructure occurred in a significant change with the increase of residence time.Mainly reflected that bromine content decreased, and the weight percent of structure Ⅲ and structureⅠincreased while structureⅡdecreased. Moreover, it can be aggravated at higher temperature.

Brominated butyl rubber was prepared by solution method, and its microstructures were characterized by 1H-NMR. It has three main microstructures, that is the unbrominated isoprene structure (structureⅠ), the exomethylene allylic bromide structure (structure Ⅱ) and the bromomethyl olefinic structure (structure Ⅲ). The effects of contact time, residence time and pH after neutralization on microstructures were investigated. The results show that the brominated reaction is complete in 1.5 initial contact minutes, and prolonging contact time or under alkaline condition can accelerate isomerization of brominated butyl rubber from structure to structure Ⅲ.

 

Determine the solubility of methyl chloride in n-hexane and regress experimental data by Peng-Robinson equation of state(EOS).Phase equilibrium equipment with magnetic stirring apparatus was developed and used in mensurating the solubility of methyl chloride in n-hexane at depression. Its high precision was proved by reliability test. The solubilities at 25，30，35，40 ℃ were measured and the averages of Henry constants are 884,959,1 067,1 172 kPa. It is found that the solubility of methyl chloride in n-hexane are decreases with the temperature increased and increases with the pressure increased. The binary parameter calculated by Peng-Robinson EOS is 0.053 4.The calculated and experimental values of equilibrium pressure are compared, the average relative deviation is 0.985%.Peng-Robinson EOS is accurate in regressing and can be used in more researches.