玻纤含量对玻纤增强聚碳酸酯微结构成型及力学性能的影响

Effect of Glass Fiber Content on Microstructure and Mechanical Properties of Glass Fiber Reinforced Polycarbonate

取不同玻纤含量的玻纤增强聚碳酸酯原料,通过注射成型得到拉伸样条,测试力学性能分析玻纤含量对复合材料力学性能的影响。通过扫描电镜观测样条断面的微观形貌,通过流变实验分析玻纤含量对材料剪切黏度的影响规律。结果表明,对比纯PC和20%玻纤含量的复合材料,其拉伸强度和弯曲强度均随着玻纤含量的增大而增大,增大幅度分别为75%和40%。而冲击强度随玻纤含量增大呈现先减小后增大的趋势,转折点在玻纤含量接近10%。同时玻纤的加入将使复合材料的黏度增大,并且表观黏度随着剪切应力的增大而减小,在剪切应力接近8000 Pa时表观黏度急剧下降,最终趋于稳定。制得一种LED高帽檐面罩微结构塑件以研究不同玻纤含量对微结构塑件成型的影响。对于此类微结构塑件,微通道的宽度随玻纤含量增大而减小,玻纤含量在10%左右时微结构成型性及综合力学性能最佳。

The tensile splines of glass fiber reinforced polycarbonate with different glass fiber contents were obtained by injection molding.The influence of glass fiber contents on the mechanical properties of composites was analyzed.The microstructure of the spline sections was observed by SEM,and the influence of glass fiber contents on the shear viscosity of the composites was analyzed by rheological experiment.The results show that the tensile strength and flexural strength of the composites with pure PC and 20%glass fiber content increase with the increase of glass fiber content,and the increase is 75%and 40%respectively.The impact strength decreases first and then increases with the increase of glass fiber content,and the turning point is close to 10%in glass fiber content.At the same time,the addition of glass fiber will increase the viscosity of the composites,and the apparent viscosity will decrease with the increase of shear stress.When the shear stress is close to 8000 Pa,the apparent viscosity will decrease sharply and eventually stabilize.A kind of LED high-hat mask micro-structured plastic parts were obtained to study the influence of different glass fiber contents on the formation of microstructured plastic parts.For such microstructured plastic parts,the width of the microchannels decreases with the increase of glass fiber content,and the microstructure and the comprehensive mechanical properties are best when the glass fiber content is about 10%.