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Abstract

Polyurethane-based aryl cyanate ester resin (PU-CER) with a biphenyl backbone obtained from polymeric 4,4‘-diphenylmethanediisocyanate, bisphenol A and cyanogen bromide was synthesized to get a polymer with better functional properties such as better adhesion and impact resistance. Synthesis of polyurethane based 4,4‘-(oxy biphenyl propane) cyanate ester involved two steps of polyurethane hydroxyl-terminated prepolymer (PU-PP) formation and esterification (PU-CER). PU-CER was cyclotrimerized to yield a triazine ring-containing polymer that possesses better adhesion at high temperature and has greater impact strength. PU-PP and PU-CER were characterized by wet chemical analysis, spectral methods and thermal methods. PU-CER showed better thermal stability and adhesion with single part polyurethane lamination adhesive and also functioned as a better toughening agent in two-part epoxy laminate system..

Keywords

Polyurethane cyanate aryl ester synthesis impact strength glass transition temperature lap shear strength water absorption

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Synthesis,Characterization and Applications of Polyurethane Aryl Cyanate Ester Resin

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