Impact of Dopamine Modified Boron Nitride on the Properties of Epoxy Resin Composites
WANG Nan, HU Chengyao, GUO Shiyan, LIAO Jun, HUO Jichuan
State Key Laboratory of Environmental Friendly Energy Materials & School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010
Abstract: For the sake of enhancing the stress load transfer between boron nitride (BN) and epoxy (EP) matrix, amino groups and hydroxyl groups were introduced on the surface of BN through co-deposition of dopamine (DA) and polyethyleneimine (PEI). The chemical bonds formed between the amine functional groups on the BN surface and the epoxy resin during curing provided strong sheet/matrix interfacial adhesion, and improved the dispersion of BN in EP matrix. Thermogravimetric analyzer (TGA), Fourier transform infrared spectrometer (FTIR), X-ray photoelectron spectroscope (XPS) and field emission scanning electron microscope (FSEM) were employed to characterize the structure and morpho-logy of the modified BN. Furthermore, the effect of addition of BN and modified BN on the tensile strength, fracture toughness (KIC) and thermal stability were investigated. The results demonstrated that the introduction of DA-PEI modified BN greatly contributed to enhancing the thermal stability and dynamic mechanical properties. Specifically, epoxy composite containing 1wt% of BN-DA-PEI nanosheets showed a remarkable improvement in tensile strength, elongation at break and KIC by 43.3%, 30.8% and 129.7%, respectively. Meanwhile, the EP/BN-DA-PEI composite showed an sharp increase of 1 063 MPa in storage modulus compared to pure PE, as well as an increase of glass transition temperature (Tg) from 167 ℃ to 178 ℃.
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2019, Vol. 33 
