Promoting Effect of Ethyl Acetate on Anionic Ring-opening Polymerization of l,3,5-Trimethyl-l,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane(D3F)

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (6): 1431.

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Promoting Effect of Ethyl Acetate on Anionic Ring-opening Polymerization of l,3,5-Trimethyl-l,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane(D3F)

YANG Peng, GAO Ya-Juan, GUAN Yong, ZHENG An-Na*

Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2010-06-17 Revised:2010-08-16 Online:2011-06-10 Published:2011-05-10
Contact: ZHENG An-Na E-mail:zan@ecust.edu.cn
Supported by:
国家自然科学基金(批准号: 5093302)和上海市重点学科建设项目(批准号: B502)资助.

Abstract

Abstract: Poly[methyl(trifluoropropyl)siloxane](PMTFPS) was prepared in the mixing chamber of a HAAKE torque rheometer using sodium silanolate as the initiator, and ethyl acetate(EA) as the promoter. The promoting effect of EA in the anionic bulk polymerization of D3F was investigated. The results show that the maximum of number average molecular weight(Mn=2.45×105) of PMTFPS was obtained with high yield(89.2%) when the polymerization was carried out in the presence of 2.74%initiator and 0.30 mol/L EA at 120 ℃ for 4.0 min. The backbiting reactions were almost suppressed and 0.74% cyclic by-products were obtained by matrix-assisted laser desorption ionization time-of-flight mass spectrometry(MALDI-TOF-MS) for EA promoter system. Investigations of differential scanning calorimetry(DSC) and thermogravimetic analysis(TGA) show that PMTFPS can be used in a wide range of operational temperatures.

Key words: Poly[methyl(trifluoropropyl)siloxane], Ethyl acetate, Anionic ring-opening polymerization, Torque rheometer

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YANG Peng, GAO Ya-Juan, GUAN Yong, ZHENG An-Na*. Promoting Effect of Ethyl Acetate on Anionic Ring-opening Polymerization of l,3,5-Trimethyl-l,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane(D3F)[J]. Chem. J. Chinese Universities, 2011, 32(6): 1431.

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Promoting Effect of Ethyl Acetate on Anionic Ring-opening Polymerization of l,3,5-Trimethyl-l,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane(D3F)

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