کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5183856 | 1381031 | 2011 | 8 صفحه PDF | دانلود رایگان |
Fluorinated polyester was synthesized from a novel α-fluoro-É-caprolactone monomer (α-FCL). The monomer was synthesized from commercially available cyclohexene oxide in three steps. Baeyer-Villiger reaction using 3-chloroperoxybenzoic acid of the corresponding 2-fluorocyclohexanone resulted in formation of two isomeric lactones α-and-É-fluoro-É-caprolactones in 1:1.2 molar ratio, respectively. Poly(α-fluoro-É-caprolactone) was synthesized by bulk ring-opening polymerization of α-fluoro-É-caprolactone monomer (α-FCL) catalyzed by stannous octanoate, Sn(Oct)2 at 120 °C for 6 h. Relationships between reaction time, polymer yield, and molecular weight were established. The ring-opening polymerization of É-fluoro-É-caprolactone (É-FCL) produce geminal fluorohydrin, which is not stable and it is subsequently dehydrofluorinated to give the corresponding aldehyde. Copolymerization of α-FCL with É-caprolactone (É-CL) in various feed ratios was also investigated. Detail microstructure analyses of the copolymers were accomplished from 1H, 13C and 2-D NMR data. Presence of fluorine atoms is expected to regulate the chemical and physical properties of the polyester.
Journal: Polymer - Volume 52, Issue 24, 10 November 2011, Pages 5431-5438