摘要
采用低压扫描电子显微镜(LVSEM)表征了MgCl2负载的Ziegler-Natta催化剂和极低产率聚丙烯颗粒的形貌.MgCl2对空气十分敏感,暴露在空气中十几秒就足以影响催化剂的形貌.LVSEM可以在低的入射电压(如1 keV)下就得到高分辨率的图像.在低入射电压下,样品表面不会产生电荷积累,因此无需对样品进行喷涂导电层处理.由于极大地缩短了与空气的接触时间,LVSEM可以避免空气对样品形貌的干扰,成为表征MgCl2负载催化剂形貌的有力手段.
The morphologies of MgCl2 - supported Ziegler - Natta catalyst and polymer particles with very low yield is observed by using low voltage scanning electron microscopy （LVSEM）. It shows that MgCl2 is very sensitive to air. Exposed to air for more than 10 s dramatically changes the morphologies of the particle. LVSEM can give images with very high resolution at low voltage, e.g. 1 keV. No additional coating of the sample surface is needed because charging is not an issue for the chosen imaging-conditions. Due to the minimized time exposed in air, it is a good option to maintain the real morphology of the catalyst by using LVSEM.
出处
《郑州大学学报（工学版）》
CAS
2008年第4期47-50,共4页
Journal of Zhengzhou University（Engineering Science）
基金
荷兰聚合物研究院资助项目(DPI331)
关键词
LVSEM
催化剂
形貌
表征
LVSEM
catalyst
morphology
characterization
