Zywice epoksydowe i poliuretany — wzajemne oddzialywanie modyfikujace. Cz. II. Przenikajace sie sieci polimerowe (IPN)

Abstract

The methods of epoxy resins (EP) and polyurethanes (PUR) mutual modification leading to the formation of interpenetrating polymer networks (IPN) and graft polymer networks (graft-IPN) were presented on the basis of literature data. Main aim of EP modification is its elasticity improving. EP modification with PUR containing functional groups (namely OH, NH 2 , NCO or anhydride groups) or urethane - acrylic systems was discussed. Rigid PUR foams modification with EP was also presented. Additionally EP modification with low molecular weight isocyanates, acting as substitutes of PUR with reactive groups, has been described. The effects of EP:PUR weight ratio, molecular weight of isocyanate component and a degree of grafting between both polymer networks on the morphology and mechanical and thermal properties of the products were characterized. EP and PUR phase separation determining the proper elasticity of the products was also presented.