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.
利用尿
酚、4,4′-
二氨基二苯基甲烷(D
DM)和
甲醛合成了双官能团尿
酚基
苯并恶嗪(U-da)。3,3′-
苯基
甲烷双(3,4-二
氢-2H-1,3-
苯并恶嗪)(P-da)是用 D
DM、
苯酚和
甲醛以类似的方法制备的。U-da 和 P-da 被固化成不同 U-da 分数的杂化聚
苯并恶嗪,其中
乌洛托品中的烷基链可以提高聚
苯并恶嗪的延展性。傅立叶变换红外光谱(FTIR)和差示扫描量热法(
DSC)研究表明,热激活开环聚合可以在相对较低的温度(180 °C)下进行,无需添加
催化剂。混合聚
苯并噁嗪通过热重分析(TGA)进行了测量。结果表明,U-da 含量对 5%和 10%重量损失所对应的温度影响较小,而 800 °C 时的残余重量则随着 P-da 含量的增加而增加。动态机械分析(
DMA)研究表明,U-da 含量为 50 wt%的杂化聚
苯并恶嗪具有相对较高的断裂伸长率(10%)和应力(101 兆帕)。杂化聚
苯并恶嗪的性能可通过成分进行调整。