Studies on multiple unsaturated poly urethane ester containing epoxy residues

Abstract

The epoxy resins are used in a large number of fields, including surface coatings, in newlineadhesives, reinforced with carbon fiber. The polyesters are most widely versatile materials and newlinehave broad spectrum of characteristics and wide applications ranging from aerospace to micro newlineelectronics. They are also important as laminating resins, molding composites, fibers, films, newlinesurface coating resins, fiber cushion. Polyurethanes are widely used in high resiliency flexible newlinefoam seating, rigid foam insulation panels, microcellular foam seals and gaskets, durable newlineelastomeric wheels and tires, automotive suspension bushings, electrical potting compounds, high newlineperformance adhesives and sealants, Spandex fibers, seals, gaskets, carpet underlay, and hard newlineplastic parts (such as for electronic instruments). newlineMerging of all the four unsaturation, epoxy, ester and urethane segments into one polymer newlinechain has not received attention academically and technically. Certain properties of newlinethermoplastics may also be improved via blending or addition to an unsaturated resin is another newlinepossibility. In order to improve certain properties of such reported polymers their blending with newlinecommercial vinyl esters (epoxy resin) such as vinyl ester epoxy resin may afford a commercially newlineimportant material for wide industrial applications. Hence the present report comprises synthesis newlineof poly (urethane-ester) having epoxy residues. newlineUnsaturated polyesters were successfully synthesized using different aromatic diamines newlineand diglycidyether of bisphenols. Unsaturated polyesters, vinyl ester and hexamethylene newlinediisocyanates used for the production of unsaturated poly(urethane-ester). newlineAll the produced polymer systems have been characterized by following techniques: newlineThe C, H, and N contents were estimated by means of Thermofinagan 1101 flash newlineelemental analyzer (Italy). The IR spectra were recorded in KBr pellets on a Nicollet 760 D newlinespectrometer. The number average weights were estimated by non-aqueous conductometric newlinetitration followed by the method reported in the li