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Poly(perfluoroether) oxadiazole elastomer system cured with terephthalonitrile oxide
Author(s) -
Cochoy Robert E.
Publication year - 1976
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.1976.070200415
Subject(s) - shore durometer , materials science , elastomer , polymer , thermal stability , oxide , polymer chemistry , compression set , ultimate tensile strength , polymerization , monomer , curing (chemistry) , composite material , compression molding , chemical engineering , natural rubber , engineering , metallurgy , mold
The terpolymerization of N,N′‐terephthalonitrile oxide (TPNO), 1,3,5‐tricyanobenzene, and oligomeric perfluoroalkylene dinitriles derived from the oligomerization of tetrafluoroethylene oxide yields poly(perfluoroether)‐1,2,4‐oxadiazole polymers which are soluble in Freon TF and bear pendent nitrile groups as curing sites. The polymerization is a two‐step, ambient‐temperature reaction. Several different perfluoroether dinitriles are shown to polymerize using this procedure. The syntheses and certain structure/property relationships of the polymers are discussed. Increasing the chain length of the perfluoroalkylene oxide dinitriles results in polymers which range from paraffin‐like solids through tough elastomers and, finally, to tacky gums. Tough, crepe elastomer gum with a T g of −64°C may be obtained in yields of 60–70%. The poly(perfluoroether) oxadiazoles may be milled with additional TPNO and press cured at 95°C (200°F). The following physical properties of the cured polymers are given: compression set, tensile strength, per cent elongation at break, set at break, and Shore A hardness. Thermal stability, moisture stability, and low‐temperature flexibility data are also presented for the cured elastomeric polymer.