扭转挤出技术制备再生碳纤维增强聚苯乙烯化学发泡复合材料

Study on Chemical Foaming Properties of Recycled⁃Carbon⁃Fiber⁃Reinforced Polystyrene Through Torsion Extrusion

采用再生碳纤维(RCF)作为增强体和成核剂及扭转挤出技术制备了聚苯乙烯(PS)/RCF为主体成分的硬质泡沫,利用三维(3D)层析成像技术、电子显微镜等对泡沫材料的微观结构、泡孔形态进行了研究。结果表明,在扭转挤出过程中,聚合物熔体产生了扭转螺旋流动,使纤维充分分散并沿流动方向取向;并且改善了整个体系的混合和温度性能,使得泡孔形态整体较为均匀;此外,泡沫质量受到机头温度的影响,且当机头温度高于180℃时,制品表面变得凹凸不平,气体发生逃逸现象;RCF的加入,会使气泡会沿着RCF取向方向生长,但是添加过多的RCF,会影响气泡成核。

Polystyrene composite foams were prepared with a torsion extrusion technology using reclaimed carbon fiber as reinforcement and nucleating agent.The microstructure and morphology of the foams were reconstructed using X‐ray Mi‐cro‐Computed 3D yomograph and scanning electron microscope.The results indicated that a twist spiral flow occurred in the polymer melt during the process of torsion extrusion,which made the fiber disperse uniformly and orient along the flow direction.The mixing and temperature properties of the whole system were improved with the torsion extrusion,and the cell morphology became more uniform.In addition,the quality of the foam was affected by the die temperature.When the die temperature was higher than 180°C,the surface of the products became uneven and the phenomenon of gas escaping was observed.With the addition of reclaimed carbon fibers,the bubble tended to grow along the fiber direction.However,the bubble nucleation will be inhibited when the fiber content is too high.