标题：Hybrid polybenzoxazine with tunable properties
作者：Xu, Hongli; Zhang, Wenli; Lu, Zaijun; Zhang, Guangzhao
作者机构：[Xu, Hongli; Zhang, Guangzhao] Univ Sci & Technol China, Dept Chem Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.; [Zhang, 更多
通讯作者地址：[Xu, HL]Univ Sci & Technol China, Dept Chem Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.
摘要：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 (similar to 180 degrees 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 degrees 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.