含马来酰亚胺苯并噁嗪的制备及其热性能研究

Preparation and Performance Study of Benzoxazine Functionalized with Maleimide

以4-马来酰亚胺基苯酚(4-HPMI)、2,2'-双[4-(4-氨基苯氧基苯基)]丙烷(BAPP)和多聚甲醛为原料,合成了含马来酰亚胺苯并噁嗪(NHPMI-bapp)。采用傅里叶变换红外光谱仪(FT-IR)和核磁共振(NMR)对单体的化学结构进行了表征,进一步采用差示扫描量热仪(DSC)表征了单体的聚合反应行为。与传统型的苯酚-二苯甲烷二胺型苯并噁嗪进行对比,结果表明马来酰亚胺基团的引入降低了能量势垒,使固化反应能够在更低温度下进行。采用热重分析仪(TGA)和动态热机械分析仪(DMA)对马来酰亚胺型苯并噁嗪聚合物进行热性能表征。结果表明,NHPMI-bapp具有较好的耐热性和热稳定性,5%和10%热失重温度分别为343℃和398℃,且在800℃时其残碳率高达47.6%,储能模量为2478 MPa,玻璃化转变温度为336℃。

Benzoxazine containing maleimide(NHPMI-bapp)has been synthesized,using 4-maleimido phenol(4-HPMI),2,2'-bis[4-(4-aminophenoxy)phenyl]propane(BAPP)and polyoxymethylene as raw materials.The chemical structure of the monomer is characterized using Fourier transform infrared spectrometer(FT-IR)and nuclear magnetic resonance(NMR),and the polymerization behavior is characterized using differential scanning calorimeter(DSC).The results show that the introduction of maleimide groups lowers the energy barrier,allowing the curing reaction to occur at lower temperatures,compared with the traditional phenolbisphenol A-type benzoxazines.The thermal properties of the NHPMI-bapp polymer are characterized using thermogravimetric analyzer(TGA)and dynamic mechanical analysis(DMA),which shows that the NHPMI-bapp polymer exhibits good heat resistance and thermal stability,and the temperatures of 5%and 10%weight loss are 343℃and 398℃,respectively.Moreover,the residual carbon rate at 800℃is as high as 47.6%,the energy storage modulus is 2478 MPa,and the glass transition temperature is 336℃.