Synthesis and polymerization of fluorinated monomers bearing a reactive lateral group - Part 8 - Study of the tetrafluoroethylene-propylene rubber modification by 4,5,5-trifluoro-4-penten-1-ol as a comonomer
B. Ameduri et al., Synthesis and polymerization of fluorinated monomers bearing a reactive lateral group - Part 8 - Study of the tetrafluoroethylene-propylene rubber modification by 4,5,5-trifluoro-4-penten-1-ol as a comonomer, J POL SC PC, 37(21), 1999, pp. 3991-3999
Citations number
37
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
The radical terpolymerization of tetrafluoroethylene (TFE) with propylene (
P) and 4,5,5-trifluoro-4-penten-1-ol (FA3) for the synthesis of fluorinated
polymers bearing hydroxy side groups is presented. The polymerization was
carried out in emulsion and in a batch operation, initiated by a redox syst
em containing tert-butyl-peroxybenzoate. The reaction proceeded without any
induction period and in a stationary state at low conversion (up to 12%).
The presence of the trifluorovinyl hydroxy monomer in the ternary system sh
arply decreased the polymerization rate, in contrast to that of the TFE/P b
inary one. The order of the reaction about FA3 was 1.25. The terpolymer com
positions were determined by elemental analysis by H-1- and F-19-NMR spectr
oscopy. An almost equimolar ratio of TFE and P base units in the terpolymer
was found, while the FA3 was inserted between TFE/P blocks. The presence o
f P increased the polymerization rate and lowered the chain transfer coming
from FA3 when compared to the TFE/FA3 binary system. Thermal properties we
re assessed. The glass transition temperatures (T-g) slightly decreased wit
h the FA3 content. The decomposition temperatures were also affected, showi
ng two steps of decomposition related to the amount of FA3 in the copolymer
, and is discussed. (C) 1999 John Wiley & Sons, Inc.