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Citation: XU Yong-Shen, DAI Jian-Hua, ZHAO Ning. Microemulsion Polymerization of Octamethylcyclotetrasiloxane[J]. Chinese Journal of Applied Chemistry, ;2005, 22(2): 148-151. shu

Microemulsion Polymerization of Octamethylcyclotetrasiloxane

1.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072

Corresponding author: XU Yong-Shen,
Received Date: 5 April 2004
Available Online: 30 September 2004

A polysiloxane microemulsion was prepared by the cationic ring-opening polymerization of octamethylcyclotetrasiloxane(D₄) in an oil-in-water microemulsion medium with dodecylbenzenesulfonic acid as the catalyst. The nucleation mechanism of the formation of polymer latex in the microemulsion medium was investigated. The results show that many new polymer particles were produced in the course of polymerization, which were much smaller than monomer droplets in size. The system underwent bimodal particle size distribution, which corresponded to smaller polymer particles and initial monomer droplets respectively. After equilibrium conversions were reached, the polysiloxane microemulsion with single peak distribution and smaller particle size than that of initial monomer droplets was formed. It suggests that the nucleation took place in the aqueous phase, not in D₄ droplets by the oligomers with end-hydroxyl groups produced as a result of D₄ ring-opening polymerization. The mechanism is similar to the homogeneous nucleation in radical emulsion polymerization. The polymerization temperature affected the particle size distribution, while its effect on the mean particle size was insignificant. Narrower particle size distribution of microemulsions was found when the polymerization was carried out at 80℃. The equilibrium molecular weight of the polymer was lower than that of the polymer from conventional emulsion system at the same polymerization temperature, and the effect of temperature on the molecular weight was little. The mass ratio of emulsifier to coemulsifier affected the size of D₄ droplets and subsequently the latex particle size of the polymer microemulsion.
- polysiloxane,
- microemulsion polymerization,
- nucleation mechanism
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