Synthesis of a coupling agent containing polyurethane chain and its influence on improving the dispersion of SiO2 nanoparticles in epoxy/amine thermoset

SiO2 nanoparticles (NPs) were modified with as-synthesized coupling agent containing isocyanate-terminated polyurethane (PUCA) to enhance the interaction between SiO2 NPs and DGEBA/DDM matrix in purpose of promoting the dispersion condition of the SiO2 NPs in cured resin. Uniform dispersion of the PUCA-SiO2 NPs was observed in the cured resin which was in obvious contrast with that of the raw SiO2 NPs and the IPTS-SiO2 NPs according to the...