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

1.
a Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China;
2.
b University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Min-Min Shen,
Received Date: 11 October 2013
Available Online: 3 December 2013

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, 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,
- Microemulsion,
- Light scattering (DLS) technique,
- Kinetics,
- Initial-rate method
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