作　　者： ; ; ; ; ;

机构地区： 华南理工大学化学与化工学院

出　　处： 《化工新型材料》 2007年第3期51-54,共4页

摘　　要： 利用阻抗匹配原理和电容器通交流断直流的频率特性,提出了在导电填料表面包覆不导电层设计的构想,来实现对表面DC电导率随填料含量的提高而增大、从而形成回路而短路等问题的改善。采用原位聚合法在短碳纤维(SCF)的表面均匀包覆一层不导电的聚苯胺(PANI),使用扫描电子显微镜(SEM),热分析(TG)以及傅里叶变换红外光谱(FTIR)等表征了改性SCF的表观形貌和结构,分析并探讨了SCF微结构与电磁波的交互作用机制。研究表明:在聚合温度为5℃,聚合反应时间为12h,苯胺与引发剂的摩尔比为1∶1,碱性溶液摩尔浓度为1mol/L时,可制得表面均匀包覆不导电PANI的改性SCF;应用改性填料制得电磁屏蔽涂料,通过同轴法兰装置测试,在频率<1.5GHz下,相对使用碳纤维体系而言,其屏蔽效能(最大值)提高了3倍多。 Both impedance matching principle and capacitor frequency characteristic which AC crossing but DC cutting off are using, non-conductive layer coated fillers was put forward to realize lessening problems such as short circuit on paint layer surface because that DC conductivity increasing with rising content of filler leads to surface conduction forming loops. A uniform non-conducting polyaniline （PANI） coated on short carbon fibers by means of in-situ polymerization. The shape and structure of the modified SCF were discussed by means of SEM, TG and FTIR. And the alternate effect mechanism about the modified SCF and electromagnetic wave was analyzed. Experimental results demonstrated that, firstly, SCF coated with a layer of uniformity non-conducting PANI base was made at temperature was 5℃, time was 12h, nAN/nAPS was 1 ： 1 and the tool concentration of alkalescency is 1M. Secondly, the SEmax of the modified SCF rose about three times large to the uncoated, which measured using the coaxial cable method.

关 键 词： 改性 电磁屏蔽

领　　域： [化学工程]