聚甲基丙烯酸甲酯(PMMA)对氰酸酯树脂(BADCy)力学性能和热性能的影响

INFLUENCE OF POLY( METHYL METHACRYLATE)( PMMA) ON THE CYANATE ESTER RESIN( BADCY) MECHANICAL PROPERTIES AND THERMAL PROPERTIES

通过异步合成法,将预聚的聚甲基丙烯酸甲酯(PMMA)用于改性双酚A型氰酸酯树脂(BADCy),制备了改性BADCy。文章通过对材料进行弯曲强度、冲击强度、动态热机械分析(DMA)、SEM、FTIR分析,探讨不同PMMA添加量对改性BADCy力学性能的影响。结果显示,与纯BADCy相比,当PMMA的质量分数为20%时,改性BADCy弯曲强度和冲击强度分别提高58.5%和88%,环氧树脂(EP)与BADCy相分离消失,玻璃化温度(Tg)基本保持不变,同时改性BADCy的粘性较低,有助于固化浇铸成型。通过使用TGA、DSC等测试手段探讨不同PMMA添加量对材料热性能的影响。结果表明,当PMMA质量分数为20%时,改性BADCy的热失重温度、质量保持率基本不变,固化热降低,反应可控性增强。

The materials were prepared on polymethyl methacrylate （PMMA） added into the bisphenol A type of cyanate ester resin （BADCy） by asynchronous synthesis method. The paper investigates the effects of weight of PMMA on the mechanical properties of the composites through flexural strength and fracture strength test and dy- namic thermal mechanical analysis （DMA） testing, while using scanning electron microscopy （SEM） and Fourier transform infrared spectrometer （FTIR）. The results show that PMMA composite material fiexural strength and frac- ture strength were the largest and increased by 58.5% and 88.3%, compared with pure BADCy. When the weight of PMMA is 20%, PMMA and BADCy react during the grafting reaction, eliminating the phase separation of epoxy resin and BADCy. The glass transition temperature （Tg） remains substantially unchanged, while the low viscosity of the composite, cast molding can be helpful. The thermal properties of composite was studied throu metric analysis （TGA）, differential scanning calorimetry （DSC）. The results show that weight loss thermo-gravi- mperature and mass retention rate were basically unchanged, while heat curing reduced the controllability of reaction, compared with pure BADCy.