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Characterization of cured polysulfide polymers by thermal degradation: Pyrolysis‐GC and thermogravimetric studies
Author(s) -
Radhakrishnan T. S.,
Rao M. Rama
Publication year - 1987
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.1987.070340517
Subject(s) - thermogravimetry , thermogravimetric analysis , pyrolysis , polysulfide , polymer , curing (chemistry) , materials science , polymer chemistry , monomer , degradation (telecommunications) , chemistry , organic chemistry , inorganic chemistry , electrode , electrolyte , telecommunications , computer science
Polymers prepared by curing thiol‐terminated liquid polysulfide polymer [HS(RS 2 ) n RSH, R = CH 2 CH 2 OCH 2 OCH 2 CH 2 ] with p ‐quinonedioxime, PbO 2 , and MnO 2 were studied by pyrolysis‐GC and thermogravimetry. Characteristic differences were observed in the composition of the pyrolyzates under flash pyrolysis at 420 and 470°C. The concentration of the cyclic monomer, 1,3‐dioxa‐6,7‐dithionane, in the pyrolyzates was found to vary considerably from polymer to polymer. The change in mechanism with the extent of degradation and the corresponding overall activation energies were evaluated by thermogravimetry. The pyrolysis‐GC and thermogravimetric data were shown to provide partial characterization of the substrates. Mn appears to be in a coordinated complex in the MnO 2 ‐cured polymer.