MOLECULAR, HYDRODYNAMIC, AND THERMAL-PROP ERTIES OF POLYIMIDE BASED ON 3,4,3',4'-TETRACARBOXYDIPHENYL OXIDE DIANHYDRIDE AND 1-(4'-AMINOPHENYL)-3-AMINOETHYLADAMANTANE

Molecular, hydrodynamic, and thermal characteristics of polyimide base d on 3,4,3',4'-tetracarboxydiphenyl oxide and 1-(4'-aminophenyl)-3-ami noethyladamantane are studied. The constants in the Mark-Kuhn-Houwink relations between the molecular mass of a polymer and its intrinsic vi scosity and sedimentation constant are obtained. It is shown that the polymer under study is flexible, has a Kuhn segment length of 46 Angst rom, and contains no long-chain branches. The presence of a bulky adam antylene fragment and hinged methylene moieties provides the existence of a rubberlike elasticity region (from 240 to 275 degrees C). The ki netic parameters of thermal degradation of the polymer are obtained by dynamic thermogravimetric analysis in air and under an inert atmosphe re.