3-甲基邻苯二酚/糠胺型聚苯并噁嗪的制备与性能

通过分子设计合成了含有酚羟基的3-甲基邻苯二酚/糠胺型苯并噁嗪(M-f). 通过差示扫描量热法(DSC)测得M-f的放热峰值温度(T_p)为172 ℃, 而间甲酚/糠胺型苯并噁嗪(MC-f)的T_p为244 ℃, 表明酚羟基的引入有利于降低苯并噁嗪的开环固化温度. 通过非等温DSC法研究2种苯并噁嗪单体的固化动力学, Kissinger法和Ozawa法的计算结果均表明M-f的表观活化能低于MC-f. 此外, 通过拉伸剪切强度测试考察了聚苯并噁嗪对于金属基材的黏附性能, M-f聚合物对于铝和低碳钢基材的拉伸剪切强度分别为2.53 MPa和3.09 MPa, 均高于MC-f聚合物.

Preparation and Properties of 3-Methylcatechol/Furfurylamine Based Polybenzoxazine

3-Methylcatechol/furfurylamine benzoxazine（M-f） containing phenolic hydroxyl group was synthesized to develop a benzoxazine that could be cured at relatively low temperature. The peak exothermic temperature（T_p） of M-f measured by differential scanning calorimetry（DSC） is 172 ℃， while the T_p of meta-cresol/furfurylamine benzoxazine（MC-f） is 244 ℃， indicating that the introduction of phenolic hydroxyl groups is beneficial to reduce the ring-opening curing temperature of benzoxazine. The curing kinetics of the two benzoxazine monomers were studied by non-isothermal DSC methods. The calculation results of Kissinger method and Ozawa method both indicated that the apparent activation energy of M-f was lower than that of MC-f. In addition， the adhesion performance of polybenzoxazine to metal substrate was explored by lap shear strength testing. The testing results demonstrated that the lap shear strengths of the M-f polymer to the aluminum and mild steel substrates reached 2.53 MPa and 3.09 MPa， respectively， which were higher than those of the MC-f polymer.