New polyheteroarylene based copolymers formulation

Free radical initiated polymerization of methyl methacrylate containing 1-1 5 wt% of dissolved polyimide is studied by a calorimetric method. It is sho wn that polyimide (up to 10 wt%) addition leads to a shifting of the initia l autoacceleration and initial autoretardation conversions to lower convers ion values than those for polymerization of plain methyl methacrylate. It i s stated that polyimide macromolecules do not create additional initiation reaction centres, but may take part in chain transfer and/or termination re actions during methyl methacrylate polymerization. Besides polyimides some other aromatic polymers, namely polyesters, polyamides, poly(ether ether ke tone)s and poly(phthalide)s, have been used in similar processes. The new c opolymers obtained differ in properties (solubility, thermal resistance, et c) compared to corresponding polymer components.