论文部分内容阅读
碳纤维表面可接枝上高聚物活性官能团,以调节复合材料中纤维与树脂之间的界面效应,从而改善复合材料的性能,通过控制接枝高聚物的结构可以很好的设计具有预定性能的界面层。热处理对纤维的强度不会造成影响,其表面官能团含量在1h附近达到最大值。未经异氰酸酯接枝处理的碳纤维表面没有聚合接枝尼龙大分子,热处理后再经过异氰酸酯处理,能明显看到尼龙分子接枝到纤维表面。当聚合单体中不添加活化剂,纤维表面的树脂接枝率可达到18.8%;单体中添加0.003的活化剂(占单体摩尔比),碳纤维表面的尼龙6接枝率只有7.65%,这是单体基体与纤维界面反应竞争的结果。碳纤维表面对原位聚合生成的尼龙以及改性尼龙结晶有很大影响,碳纤维未接枝处理时表面形成的横晶比较少;碳纤维接枝处理后可以看见纤维附近存在大量晶体结构,结晶体密度高,有利于材料性能改良。
The surface of the carbon fiber can be grafted with active functional groups of the polymer to adjust the interfacial effect between the fiber and the resin in the composite material so as to improve the performance of the composite material. By controlling the structure of the grafted polymer, The interface layer. Heat treatment on the strength of the fiber will not be affected, the surface functional group content reached the maximum in the vicinity of 1h. No isocyanate grafted carbon fiber surface graft polymerization of nylon macromolecules, heat treatment and then through the isocyanate treatment, we can clearly see the nylon molecules grafted to the fiber surface. When the activator is not added in the polymerization monomer, the grafting rate of the resin on the surface of the fiber can reach 18.8%; 0.003 activator (monomer mole ratio) is added into the monomer, the grafting rate of the nylon 6 on the surface of the carbon fiber is only 7.65% This is the result of the monomer matrix reacting with the fiber interface reaction. The surface of carbon fiber has a great influence on the nylon and modified nylon crystal produced by in-situ polymerization. There is less transverse crystal on the surface when carbon fiber is not grafted. After grafting treatment of carbon fiber, a large amount of crystal structure exists near the fiber and the crystal density is high , Is conducive to material properties improvement.