The solution polymerization of aromatic diester~liacid monomers with aromatic diamines was investigated as an alternative to the more conventional 'two-step' dianhydride~liamine route. This method has been successfully applied to a variety of soluble polyimide systems and has proven to be a suitable route for the synthesis of controlled- or uncontrolled- (high-) molecular-weight, soluble polyimides, which exhibit high extents of imidization, M,/M. values of 1.9-2.0 and glass transition temperatures that are in agreement with those measured for polyimides prepared by the conventional synthesis. Acetylene-functionalized imide oligomers have also been synthesized via ester-acids. Model studies indicate that polymerization is preceded by regeneration of dianhydride from the diester-diacids
Посилання на статтю:
Synthesis of soluble polyimides and functionalized imide oligomers via solution imidization of aromatic diester-diacids and aromatic diamines / T. M. Moy, C. D. DePorter and J. E. McGrath // Polymer. – 1993. – Vol 34. – P. 819-824.