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Properties of polypyromellitimides containing phosphorus
Author(s) -
Varma I. K.,
Kumar Ramakant,
Saxena Sneh,
Varma D. S.
Publication year - 1991
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.1991.070420209
Subject(s) - differential scanning calorimetry , thermogravimetry , phosphine oxide , curing (chemistry) , thermal stability , polymer chemistry , char , polymer , polymerization , materials science , ether , chemistry , chemical engineering , phosphine , organic chemistry , inorganic chemistry , pyrolysis , physics , engineering , thermodynamics , catalysis
The paper deals with the synthesis and characterization of seven polypyromellitimide samples having varying contents of phosphine oxide and ether linkages in the backbone with pendant maleimido groups. Curing characteristics and thermal stability of polymers were evaluated by differential scanning calorimetry and dynamic thermogravimetry. It was observed that an increase in pendant maleimido groups resulted in an increase in the heat of polymerization. Char yield also increased with increase in phosphorus content. Conductivity and dielectric parameters were also evaluated. The mechanism of conduction was found to be a combination of electronic and ionic type.