T. Pascal, R. Mercier, B. Sillion
Apr 1, 1989
Citations
1
Influential Citations
21
Citations
Journal
Polymer
Abstract
Starting from two aromatic diamines carrying meta phenoxy linkages, 3,3′-[2,6-pyridinediylbis(oxy)]bis-benzeneamine (BAPPY) and 3,3′-[1,3-phenylenebis(oxy)]bisbenzeneamine (BAPB) we have synthesized two thermoplastic linear polyimides by polycondensation with 3,3′;4,4′ benzophenone dianhydride (BTDA) and two thermosetting bismaleimides by condensation with maleic anhydride. The characterization of these different compounds was achieved by d.s.c., t.m.a., t.g.a. and d.m.a. Each linear polyimide was then mixed with the corresponding bismaleimide, or with another bismaleimide having a different chemical structure, 1,1′-(methylenedi-1,4-phenylene)bis(1H-pyrrole-2,5-dione). The mixtures blended in N-methylpyrrolidone solution were cast onto glass plate and were thermally dried following a cure cycle of 1 h at 100°C, 1 h at 150°C and 1 h at 200°C. This did not allow the polymerization of maleimide groups. The thermomechanical analysis of the resulting films showed a reduction of the glass transition temperature of polyimides in agreement with a plasticizing by bismaleimides.