采用SEM、金相显微镜、AFM、XPS、XRD表征了3种国产(CCM40J,CCM40,CCM46J)和1种进口(东丽M40JB)高模碳纤维的表面特性及结晶结构,并对高模碳纤维与环氧树脂的微观界面及复丝力学性能进行了研究.结果发现:高模碳纤维的表面都存在明显沟槽,但表面粗糙度差异不大,均有圆形、腰果形、椭圆形等截面形状;表面主要含C、O、N、Si 4种元素,M40JB的O/C比和活性碳原子含量都高于国产高模碳纤维;按M40JB、CCM40J、CCM40、CCM46J的顺序,石墨微晶尺寸越来越大,石墨化程度增高,M40JB的取向度最小,CCM46J的取向度最大,而CCM40J与CCM40的取向度相近;表面能大小顺序为M40JB＞ CCM40＞ CCM46J＞ CCM40J,80℃时与环氧树脂E51、固化剂4,4'-二氨基二苯砜(DDS)的树脂体系E51 DDS和4,4'-二氨基二苯甲烷环氧树脂(AG80)、固化剂DDS的树脂体系AG80-DDS的动态接触角均在35°～50°之间,说明浸润性良好;CCM46J与E51-DDS的界面剪切强度(IFSS)最高,M40JB与AG80-DDS的界面剪切强度最高;国产3种高模碳纤维复丝的拉伸强度和拉伸模量都高于M40JB,其中CCM40J的拉伸强度最高,CCM46J的拉伸模量最高;所测高模碳纤维复丝的压缩强度能达到各自拉伸强度的44％～53％,CCM46J复丝的压缩强度最高.
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