氙弧灯照射对航空有机玻璃性能的影响

Effect of Xenon Arc Lamp Irradiation on Properties of Aviation Perspex

在氙弧灯耐气候试验箱中对YB-2航空透明材料(有机玻璃)进行了1 620 h的照射试验,采用凝胶渗透色谱仪(GPC)、红外光谱仪(FTIR)、差示扫描量热仪(DSC)、光电雾度仪、扫描电镜(SEM)、万能试验机表征和测试了照射不同时间有机玻璃的相对分子质量、红外吸收光谱、玻璃化温度(Tg)、透光率、表面形貌、拉伸强度等,分析氙弧灯照射对有机玻璃性能的影响。研究结果表明:在氙弧灯照射360 h后,有机玻璃的透光率和玻璃化温度未发生明显变化,也未产生新的化学基团,但相对分子质量有所下降;照射720 h后,有机玻璃的拉伸强度下降,且随照射时间的延长,拉伸强度下降越明显;照射1 620 h后,有机玻璃表面出现了裂纹,拉伸强度降低了33%,即出现了老化特征。

Aviation perspex YB -2 （PMMA） is irradiated in a xenon arc lamp weather resistance test chamber for 1 620 hours. The relative molecular mass, infrared absorption spectrum, glass transition temperature Tg, light transmittance, surface morphology and tensile strength of YB - 2 PMMA exposed in xenon lamp for different durations are tested and characterized using gel permeation chromatograph （GPC）, infrared spectrometer （IR）, differential scanning calorimetry （DSC）, optical haze instrument, scanning electronic microscopy （SEM） and universal testing machine, and so as to comprehensively analyze the influence of xenon arc lamp on the performance of aviation perspex. The results showed that xenon arc lamp irradiation of 360 hours, the transmittance and glass transition temperature of the PMMA do not change significantly, and no new chemical group is produced according to the infrared testing results, but the relative molecular mass is descend, the tensile strength is decreasing after exposure of 720 hours. The surface of PMMA occured some tiny cracks and the tensile strength is descended 33%.