Premium
Study of radical copolymerization of tetrafluoroethylene with ethylene in bulk
Author(s) -
Kostov G. K.,
Nikolov Al. T.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070551104
Subject(s) - copolymer , tetrafluoroethylene , monomer , polymer chemistry , enthalpy , melting point , enthalpy of fusion , ethylene , materials science , reactivity (psychology) , yield (engineering) , activation energy , polymer , chemistry , thermodynamics , organic chemistry , catalysis , physics , alternative medicine , pathology , metallurgy , medicine , composite material
Radical copolymerization of tetrafluorethylene (TFE) with ethylene (E) by azo‐ bis ‐iso‐butyronitrile in the temperature interval 333–363 K, monomer pressure from 3.0 to 7.0 MPa at TFE/E molar ratio from 77/23 to 23/77 in bulk was carried out. The effect of reaction conditions on the yield, molecular weight, and polymer composition of copolymer synthesized was studied. White powdery alternating copolymers were obtained at TFE content in the monomer mixture from 65 to 85 mol %. Copolymerization rate R was described by the equation R = k M [ln] [Σ M ] 1.3 which was related to the heterophase character of the reaction. The reactivity ratio of TFE and E (0.067 ± 0.12 and 0.52 ± 0.18, respectively) and apparent activation energy E a = 135 kJ/mol were found. The TFE and E block formation probabilities were calculated and compared with IR spectroscopy data. Melting point, entropy, and enthalpy of fusion of the entirely alternating copolymers were determined. Some of the basic properties of the alternating copolymers obtained were also studied. © 1995 John Wiley & Sons, Inc.