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通过对 PSF/环氧共混体系剥离强度、DMA及 SEM断口图象的分析研究 ,揭示了共混体系相结构演变与脆韧转变的对应关系和增韧机理。研究表明 ,当共混体系形成较均匀完整的 PSF连续网膜包覆环氧球粒分散相结构 ,并且网膜厚度小于 0 .0 4μm时 ,体系呈现高韧性 ,此时体系由断面上高韧性的 PSF网膜产生大量的塑性变形吸收能量而使体系增韧 ,不同于传统“海岛结构”的增韧结构和机理 ,研究结果对开发高韧性先进复合材料基体和结构胶粘剂具有重要意义
Based on the analysis of peel strength, DMA and SEM fracture images of PSF / epoxy blends, the corresponding relationship between phase structure evolution and brittle-ductile transition and the toughening mechanism were revealed. The results show that the system exhibits high toughness when the system is formed with more uniform and uniform PSF continuous network coating epoxy particles dispersed phase structure, and the omentum thickness is less than 0. Of PSF omentum produced a large amount of plastic deformation energy absorption and make the system toughening, different from the traditional “island structure” toughening structure and mechanism, the research results for the development of high toughness advanced composite matrix and structural adhesives is of great significance