Kinetics of ring-opening polymerization of octamethylcyclotetrasiloxane in microemulsion  被引量:1

Kinetics of ring-opening polymerization of octamethylcyclotetrasiloxane in microemulsion

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作  者:Chun-Ning Sun Min-Min Shen Lian-Li Deng Jian-Qiang Mo Bao-Wen Zhou 

机构地区:[1]Laboratory of Cellulose and Lignocellulosics Chemistry,Guangzhou Institute of Chemistry,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出  处:《Chinese Chemical Letters》2014年第4期621-626,共6页中国化学快报(英文版)

摘  要: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.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.

关 键 词:Polysiloxane Microemulsion Light scattering (DLS) technique KineticsInitial-rate method 

分 类 号:O631.5[理学—高分子化学]

 

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