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- W2100074053 abstract "The difunctional urushiol-based benzoxazine (U-da) was synthesized by utilizing urushiol, 4,4′-diaminodiphenyl methane (DDM) and formaldehyde. The 3,3′-phenylmethanebis(3,4-dihydro-2H-1,3-benzoxazine) (P-da) was prepared by the similar procedure with DDM, phenol and formaldehyde. The U-da and P-da were cured into hybrid polybenzoxazine with different U-da fractions, where the alkyl chains in urushiol can improve the ductility of the polybenzoxazines. Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC) studies demonstrate that the thermally activated ring-opening polymerization can happen at a relatively low temperature (∼180 °C) without addition of catalyst. The hybrid polybenzoxazines were measured by thermal gravimetric analysis (TGA). It shows the temperatures corresponding to the 5% and 10% weight loss are slightly affected by the U-da content whereas the residual weight at 800 °C increases with P-da content. Dynamic mechanical analysis (DMA) studies indicate that the hybrid polybenzoxazine with U-da content of 50 wt% has a relatively high elongation (10%) and stress (101 MPa) at break. The properties of the hybrid polybenzoxazine can be tuned by the composition." @default.
- W2100074053 created "2016-06-24" @default.
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- W2100074053 date "2013-01-01" @default.
- W2100074053 modified "2023-09-26" @default.
- W2100074053 title "Hybrid polybenzoxazine with tunable properties" @default.
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- W2100074053 doi "https://doi.org/10.1039/c3ra22247k" @default.
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