STUDIES ON THE INFLUENCE OF SOFT-SEGMENT STRUCTURE ON THE PROPERTIES OF POLYURETHANE ADHESIVE

Two series of polyesters were synthesized from adipic acid(AA), dimeth yl terephthalate(DMT), isophthalic acid(IPA), phthalic anhydride(PA), with ethylene glycol(EG), butylenediol-1,4(1,4-BDO), propanediol-1,2(1 ,2-PDO), hexanediol-1,6(1,6-HDO) and diethylene glycol(DEG) respective ly by using melt-polycondensation method in the presence of H3PO4, SnC l2 . 2H(2)O, [GRAPHICS] as catalyst respectively. The technological co nditions of the polyesters synthesized were studied. This polyesters r eact separately with diphenylmethane diisocyanat(MDI) by solution poly merization to afford two series of linear block polyurethane adhesives . The crystallinity and the melting point of the polyesters and polyur ethanes were determined by means of X-ray diffraction (WAXD), differen tial scanning calorimetry(DSC), The relationship between structure and properties of the polyesters, expecially the influence of the polyest ers type on adhesion behavior of the corresponding the polyurethanes w ere discussed.