弹性体与蒙脱土对苄基化棉秆皮纤维型复合材料性能的影响

Effect of elastomer and montmorillonite on mechanical properties of cotton stalk bast fiber benzyled composite

苄基化棉秆皮纤维因热熔粘度过高,无法有效地浸润纤维,故其自增强复合材料力学性能受到影响。分别采用聚氨酯(TPU)和蒙脱土(MMT)与苄基化棉秆皮纤维混炼制备复合材料,以提高复合材料的韧性和强度;利用SEM分别研究了添加TPU和MMT后复合材料的微观结构,探究TPU和MMT的用量变化对复合材料力学性能的影响及原因。结果表明:TPU和MMT对苄基化棉秆皮纤维型复合材料具有良好的增韧增强效果;当TPU用量在20%以上时,增韧效果较好,但不能同时增强和增韧;而MMT用量在4%时,可以同时获得较好的增韧和增强效果。

Due to the hot melt viscosity, cotton stalk bark fiber with benzylation cannot be effectively infiltrated, so the mechanical properties of the self-reinforced composites are affected. The polyurethane （TPU） and montmorillonite （MMT） are used respectively to mix and refine with benzyl cotton stalk bark fiber to prepare the composites, in order to improve strength and toughness of the composites. The microstructures of the composites with the addition of TPU and MMT were studied by SEM, the influences and reasons of the dosage of TPU and MMT on the mechanical properties of the composite are explored. The results show that the composites mixed with TPU and MMT have good toughening and reinforcing effect. When the content of TPU is more than 20%, TPU toughened effect is better. When the content of MMT is 4%, good strengthening and toughening effects can be obtained at the same time.