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Kinetics of ring-opening polymerization of octamethylcyclotetrasiloxane in microemulsion

Chun-Ning Sun ,  Min-Min Shen ,  Lian-Li Deng ,  Jian-Qiang Mo ,  Bao-Wen Zhou

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Citation:  Chun-Ning Sun, Min-Min Shen, Lian-Li Deng, Jian-Qiang Mo, Bao-Wen Zhou. Kinetics of ring-opening polymerization of octamethylcyclotetrasiloxane in microemulsion[J]. Chinese Chemical Letters, 2014, 25(4): 621-626. doi: 10.1016/j.cclet.2013.12.021 shu

Kinetics of ring-opening polymerization of octamethylcyclotetrasiloxane in microemulsion

    • 通讯作者: Min-Min Shen,
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 apparent activation energy (Ea), which was determined by half-period method, is 95.32 kJ mol-1.

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  • 发布日期:  2013-12-25
  • 收稿日期:  2013-10-11
  • 网络出版日期:  2013-12-03
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