STUDY OF VINYLIDENE FLUORIDE (VF2) TELOMERIZATION AND COTELOMERIZATION .2. VF2 AND CHLOROTRIFLUOROETHYLENE (CTFE) COTELOMERIZATION WITH 2-HYDROXYETHYLMERCAPTAN BY RADICAL INITIATION
B. Boutevin et al., STUDY OF VINYLIDENE FLUORIDE (VF2) TELOMERIZATION AND COTELOMERIZATION .2. VF2 AND CHLOROTRIFLUOROETHYLENE (CTFE) COTELOMERIZATION WITH 2-HYDROXYETHYLMERCAPTAN BY RADICAL INITIATION, Journal of fluorine chemistry, 74(1), 1995, pp. 37-42
The radical telomerization of vinylidene fluoride (VF2) and of chlorot
rifluoroethylene (CTFE) with 2-hydroxyethylmercaptan as the telogen wa
s investigated. The corresponding homotelomers R-S-(CF2-CFCl)(n)-H (C-
n) and R-S-(CH2-CF2)(n)-H (V-n) with R = -CH2CH2OH were synthesized an
d the 1:1 adducts identified. The VF2/CTFE/thiol reaction gave a mixtu
re of the expected products, homotelomers and cotelomers. By various m
ethods, mainly by F-19 NMR spectroscopy, the chain length and tacticit
y of these telomers were determined. For example, after analysis, a fr
action of the cotelomers was in good agreement with the general formul
a HO-CH2-CH2-S-(CF2-CFCl)(x)-(CH2-CF2)(y)-H, with x and y close to 4.
Moreover, by comparison with the spectra of homotelomers of VF2 and CT
FE, it was shown that these cotelomers exhibit an alternating structur
e.