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Kinetics of ring-opening polymerization of octamethylcyclotetrasiloxane in microemulsion 被引量:1
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作者 Chun-Ning Sun Min-Min Shen +2 位作者 Lian-Li Deng jian-qiang mo Bao-Wen Zhou 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第4期621-626,共6页
Polysiloxane latexes were prepared by microemulsion polymerization of octamethylcyclotetrasiloxane (D4) in the absence of co-emulsifier with octadecyl trimethyl ammonium chloride as a cationic emulsifier and potassi... Polysiloxane latexes were prepared by microemulsion polymerization of octamethylcyclotetrasiloxane (D4) in the absence of co-emulsifier with octadecyl trimethyl ammonium chloride as a cationic emulsifier 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, emulsifier and initiator concentrations and the temperature on polymerization conversions were investigated. From the kinetic results, the rate of polymerization, Rp at 80℃ can be expressed as Rp = k[D4]^0.79 [OTAC]^0.64[KOH]^0.38 and the aonarent activation energy(Ea). which was determined by half-period method, is 95.32 kJ mol^-1. 展开更多
关键词 Polysiloxane Microemulsion Light scattering (DLS) technique KineticsInitial-rate method
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