VARIOUS PROPERTIES OF DIIMIDE DIACID-MODIFIED SATURATED POLYESTERS

Polyesterdiimide prepolymers containing synthesized diimide-diacid mon omer (DIDAn) were synthesized under conditions previously reported. On e-component varnishes were obtained by mixing the synthesized prepolym ers with phenol-blocked toluene diisocyanate (TDI) and/or hexamethylen e diisocyanate (HMDI). The solubility parameter of diimide-modified po lyester prepolymer was investigated using an intrinsic viscosity measu rement. Thermal behavior and pyrolysis activation energy were also inv estigated using thermogravimetric analysis. The thermal stability incr eased with an increase in the content of DIDA. The diimide-modified po lyester one-component varnishes coated onto an aluminum panel were fou nd to be acceptable, according to the specification of ASTM D-3794. (C ) 1994 John Wiley & Sons, Inc.