利用微量双螺杆挤出机（Hakke MiniLabⅡ,Rheomex CTW5）,通过熔融共混挤出注塑的方法,在聚碳酸酯（PC）中添加炭纤维（CF）进行复合增强。实验对共混物加工过程中的流变行为进行了分析,研究了炭纤维含量对复合材料力学性能的影响,探讨了其黏度与力学性能变化的机理,由扫描电子显微镜观测拉伸及冲击破坏的试样断面形态。结果表明,当CF质量分数为2%时,复合材料非牛顿指数n值最小,假塑性最强,易于加工;同时,复合材料的综合力学性能也最为优异。扫描电镜照片显示,拉伸破坏的主要方式为界面脱胶,而冲击破坏的主要方式为纤维断裂。
Based on melting experiments of carbon fiber（CF） reinforced polycarbonate（PC） composites in micro twin-screw extruder（Hakke MiniLabⅡ,Rheomex CTW5）,the rheological behavior of PC/CF blends was studied during melting process,the effects of CFs content on mechanical properties of PC/CF blends and the mechanism of variable viscosity and mechanical properties were also studied.The tensile break area and impact area of PC/CF blends were characterized by scanning microscopy（SEM）.The results show that when CF mass fraction is 2%,the minimum of non-Newtonian value is obtained,meanwhile,the mechanical properties of composite are outstanding,meaning the composites have good processing properties and mechanical properties.Scanning electron microscopy analysis shows： the tensile failure of composites is mainly interface degumming,and the impact failure of composites is mainly fiber breakage.
参考文献
| [1] | 马新忠,汪洋,王宇.聚碳酸酯拉伸力学性能的应变率相关性实验[J].高分子材料科学与工程,2009(09):131-134. |
| [2] | D.D.L. Chung .Comparison of submicron-diameter carbon filaments and conventional carbon fibers as fillers in composite materials[J].Carbon: An International Journal Sponsored by the American Carbon Society,2001(8):1119-1125. |
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