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Polysiloxane latexes were prepared by microemulsion polymerization of octamethylcyclotetrasiloxane(D4) in the absence of co-emulsifier with octadecyl trimethyl ammonium chloride as a cationic emulsiner and potassium hydrate as an initiator.The particle size was determined by the dynamic light scattering(DLS) technique and the reaction rates of the polymerization were discussed.Furthermore,the kinetics was studied by an initial-rate method,and the effects of the monomer,emulsiner and initiator concentrations and the temperature on polymerization conversions were investigated.From the kinetic results,the rate of polymerization,R_p at 80 ℃ can be expressed as R_p = k[D4]~(0.79)[OTAC]~(0.64)[KOH]~(0.38) and the apparent activation energy(E_a),which was determined by half-period method,is 95.32 kJ mol~(-1).
Polysiloxane latexes were prepared by microemulsion polymerization of octamethylcyclotetrasiloxane (D4) in the absence of co-emulsifier with octadecyl trimethyl ammonium chloride as a cationic emulsiner and potassium hydrate as an initiator. Particle size was determined by the dynamic light scattering (DLS) technique and the reaction rates of the polymerization were discussed. F urthermore, the kinetics was studied by an initial-rate method, and the effects of the monomer, emulsiner and initiator concentrations and the temperature on polymerization conversions were investigated. From the kinetic results, the rate of Rp at 80 ° C can be expressed as R_p = k [D4] ~ (0.79) [OTAC] ~ (0.64) [KOH] ~ 0.38 and the apparent activation energy (E_a), which was determined by half-period method, is 95.32 kJ mol ~ (-1).