Correlation of intermolecular interaction energy and properties of cross-linked polybiphenyloxidpyromellitimide

Deformation-toughness properties, thermal and form stability of polypyromel litimide films modified with bis-maleimides of various chemical composition in different quantities are investigated. Activation energies of thermooxi dative destruction are estimated according to the data of temperature-tough ness correlation in the solid state and on the basis of the data obtained b y means of dynamic thermogravimetry in the liquid state. The values of the energy of intermolecular interactions in films are determined as their rema inder. Linear correlations between the energy of intermolecular interaction s and mechanical properties of polypyromellitimide films modified with bis- maleimides are established, which is of special importance for further unde rstanding of the essence of the phenomena responsible for the formation of certain characteristics, as well as for obtaining of polyimide materials wi th given properties with minimum loss of time, material resources and labou r. (C) 1999 Elsevier Science Ltd. All rights reserved.