摘要
在金属磁性微粉表面通过偶联剂(A-151)引发苯乙烯(St)聚合,研究了反应温度、偶联剂用量、引发剂用量及反应时间对接枝率的影响。用SEM、RA-IR等方法对磁性微粉表面聚苯乙烯粒子膜的形貌、结构进行表征,并对改性前后磁性微粉/聚苯乙烯复合材料的复磁导率和复介电常数等微波电磁参数进行了测试。结果表明:苯乙烯通过偶联剂(A-151)以化学键的方式接枝在磁性微粉表面,形成一层高电阻率的有机薄膜,在复磁导率变化不大的情况下,有效降低了磁性微粉的复介电常数。
The surface of metal magnetic powders was modified by polystyrene, which was formed by chemical bond quomodo grafting styrene to the surface of metal magnetic powders by silane coupling agent A-151.We research the temperature, dosage of silane coupling agent A-151, dosage of BPO, and length to the graft efficiency. The appearance, phase constitution were characterized by SEM, RA-IR. And the powders were randomly dispersed in paraffin for microwave electromagnetic parameters test and comparison. The results show that a high resistivity film was formed on the powders surface by chemical bonding, and the real and imaginary parts of complex permittivity of the sample decrease largely but corresponding complex permeability decrease slightly.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第5期777-781,共5页
Journal of University of Electronic Science and Technology of China
基金
部级预研基金(5141001020DZ02)
关键词
接枝率
金属磁性微粉
介电常数
聚苯乙烯
表面改性
grafting ratio
metal magnetic powder permittivity polystyrene surface modification
