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Improving properties of polyurethane (PU) elastomers have drawn much attention. To extend the properties of the modified PU composite, here a new method via the reaction of poly(urethane‐imide) diacid (PUI) and silane‐modified epoxy resin (diglycidyl ether of bisphenol A) was developed to prepare crosslinked poly (urethane‐ imide)/epoxy/silica (PUI/epoxy/SiO2) hybrids with enhanced thermal stability. PUI was synthesized from the reaction of trimellitic anhydride with isocyanate‐terminated PU prepolymer, which was prepared from reaction of polytetramethylene ether glycol and 4,4′‐diphenylmethane diisocyanate. Thermal and mechanical properties of the PUI/epoxy/SiO2 hybrids were investigated to study the effect of incorporating in situ SiO2 from silane‐modified epoxy resin. All experimental data indicated that the properties of PUI/epoxy/SiO2 hybrids, such as thermal stability, mechanical properties, were improved due to the existence of epoxy resin and SiO2.
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Liu et al. (2010) studied this question.
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