The unidirectional ramie fiber reinforced composite based on Cycom6070 could be phenolic resin was prepared and the thermal and mechanical properties of resin, fiber and composite were studied. The results show that after cure for lh at 100 °C , the lowest complex viscosity of Cycom6070 resin increase from 0. 1 Pa · S to 3. 6 Pa · S, It could be used to produce prepreg. TGA curve indicates when the temperature increases to 200 °C , the weight loss of ramie fiber is about 8% , and when the temperature is higher than 200 °C , the weight loss curve is sharply declined. Mechanical properties of composite reinforced by unidirectional ramie fiber modified by coupling agent are much higher than those of composite reinforced by ramie fiber without modifying. SEM photographs show that coupling modification increases the compatibility between the resin and fiber in composite.%制备了基于Cycom6070酚醛树脂的单向苎麻纤维增强复合材料,并研究了树脂、纤维及复合材料的热性能和力学性能.研究表明:将Cycom6070酚醛树脂在100℃固化1h,树脂的最低熔体黏度由0.1Pa·s变为3.6 Pa·s,适合预浸料的制备；由热失重曲线(TGA)可知:当温度升到200℃时,苎麻纤维失重约为8％；当温度升至200℃以上时,失重非常明显.经过偶联处理的苎麻纤维增强复合材料MU-62％的力学性能,均优于没有经过表面处理的纤维增强复合材料GU-62％的力学性能.电镜照片显示,纤维表面经过偶联处理后,很好地提高了复合材料中树脂和纤维界面的相容性.
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