摘要
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。
High polymer active functional groups can be grafted on the surface of carbon fibers so as to adjust the interface effect between fibers in the composite material and resin and improved the performance of composite material,by controlling the structure of grafted high polymer,the interface layer with intended performance can be well designed.Heat treatment does not affect the fiber strength,the content of functional groups on the surface of the fibers reached the max.value around 1h.There were no macromolecules polymerized and grafted on the surface of carbon fibers not subjected to isocyanate grafting treatment.Through isocyanate treatment after heat treatment,it can be obviously seen that the nylon molecules were grafted on the fiber surface.When no activating agent was added in the polymerized monomers,the resin grafting percent of fiber surface can reach 18.8%.When 0.003 activating agent（mole ratio of it to monomers） was added in the monomers,the grafting percent of PA6 on surface of carbon fibers was only 7.65%,this was the result of reactive competition on the interface between monomer matrix and fibers.Surface of carbon fibers exerts great influence on the nylon generated by in-situ polymerization and crystallization of modified nylon,there were less crystals formed on the surface when the carbon fibers were not subjected to grafting treatment.After the carbon fibers were grafting treated,it can be seen that there existed a lot of crystal structure near the fibers with high density of crystals favorable to performance improvement of material.
出处
《化工新型材料》
CAS
CSCD
北大核心
2011年第10期100-103,共4页
New Chemical Materials
关键词
己内酰胺
尼龙6
碳纤维
阴离子
原位聚合
界面
caprolactam
nylon 6
carbon fiber
anion
in-situ polymerization
interface
