Carbon fiber reinforced plastics (CFRPs) were irradiated with ultraviolet rays (UVR), and its structural variations were observed by high-resolution transmission electron microscopy. The lattice images of the resin, fibers, and fiber/resin interface regions in CFRPs and their spatial frequencies were investigated before and after UVR irradiation. In the fiber regions, the layer spacing of graphite structures increased after UVR irradiation. In the fiber/resin interface regions, the resin and the fiber adhered tightly at the atomic level before UVR irradiation. The anisotropic interface phases, in which atom-pairs having wide spacings were aligned along the direction perpendicular to the interface planes, were formed. After UVR irradiation, the tight interface adhesion was maintained, whereas the roughness of the interface shape increased. The effects of UVR irradiation on the mechanical properties of CFRPs were revealed from the atomistic structural variations in the resin, the fibers, and the fiber/resin interfaces.

用紫外线（UVR）照射碳纤维增强塑料（CFRPs），并通过高分辨率透射电子显微镜观察其结构变化。在UVR照射前后研究了CFRP中树脂、纤维和纤维/树脂界面区域的晶格图像及其空间频率。在纤维区域，UVR 照射后石墨结构的层间距增加。在纤维/树脂界面区域，树脂和纤维在紫外线照射前在原子水平上紧密粘附。形成各向异性界面相，其中具有宽间距的原子对沿垂直于界面平面的方向排列。UVR照射后，保持紧密的界面粘附，而界面形状的粗糙度增加。