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8307025 
Journal Article 
Synthesis and characterization of poly[methyl(3, 3, 3-trifluoropropyl)siloxane] with narrow molecular weight distribution 
Yi, LM; Zhan, XL; Chen, FQ 
2008 
1 
Journal of Zhejiang University- Science A
ISSN: 1673-565X
EISSN: 1862-1775 
ZHEJIANG UNIV 
HANGZHOU 
22 
2 
299-304 
Chinese 
WOS:000258855400020 
Poly[methyl(3, 3, 3-trifluoropropyl)siloxane] (PMTFPS) is an important silicone material with great value due to its superior physical and chemical properties. In this study, using the high-vacuum polymerization technique and the co-solvent of hexane and THF at 0°C, the controlled anionic ring-opening polymerization (ROP) of 1, 3, 5-trimethyl-1, 3, 5-tris(3', 3'3'-trifluoropropyl)cyclotrisiloxane (F3) was carried out, and then the benzyl chloride-terminal poly[methyl(3, 3, 3-trifluoropropyl)siloxane] (PMTFPS-BzCl) was synthesized. The initiator used for the ROP is the lithium silanolate which was made directly by the reaction of n-butyllithium and F3 in the reactor at room temperature before polymerization. The obtained polymers, PMTFPS-BzCl, has narrow molecular weight distribution with distribution rang of 1.03 to 1.08, and its yield is more than 93%. It indicates that, using the proposed synthesis process, the 'back-biting' by the chain ends as well as the redistribution reactions between the siloxane chains were efficiently suppressed during the anionic ROP of F3. 
Anionic polymerization; Controlled polymerization; Living polymerization; Poly[methyl(3, 3, 3-trifluoropropyl)siloxane]; Ring-opening polymerization (ROP)