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探究了热处理对聚酰胺6(PA6)在碳纤维(CF)表面的结晶行为及其界面力学性能的影响。利用差示扫描量热法(DSC)、偏光显微镜(POM)观察法等分析手段考察了热处理对PA6在CF表面结晶行为的影响,揭示了在热处理过程中,PA6进行链段重排,形成小且不完善的新结晶,导致结晶度的上升以及界面横晶形貌的完善;进一步通过单丝微球脱粘实验、单向CF/PA6复合材料横向拉伸实验考察了热处理对PA6与CF的界面结合性能的影响,揭示了经退火热处理的试样,由于弱界面和应力集中的减少使得界面剪切强度增加以及单位体积断裂能下降。
The effect of heat treatment on the crystallization behavior and interfacial mechanical properties of polyamide 6 (PA6) on carbon fiber (CF) was investigated. The effects of heat treatment on the crystallization behavior of PA6 on CF were investigated by means of differential scanning calorimetry (DSC) and polarizing microscope (POM) observation. The results showed that during the heat treatment, PA6 rearranged to form small And the imperfect new crystals led to the increase of crystallinity and the improvement of the transverse crystal morphology of the interface. Further, through the debonding experiment of the monofilament microspheres, the transverse tensile test of the unidirectional CF / PA6 composite was carried out to investigate the effect of heat treatment on the properties of PA6 and CF The influence of the interfacial bonding properties reveals that the annealed heat-treated specimens show that the interfacial shear strength increases and the unit volumetric fracture energy decreases due to the reduction of weak interface and stress concentration.