物理化学学报 >> 2005, Vol. 21 >> Issue (07): 703-706.doi: 10.3866/PKU.WHXB20050701

研究论文    下一篇

PTFE超细颗粒的表面活化与化学接枝

郎需庆; 马红钦; 谭欣; 朱慧铭   

  1. 天津大学化工学院, 天津 300072
  • 收稿日期:2004-11-04 修回日期:2004-12-14 发布日期:2005-07-15
  • 通讯作者: 马红钦 E-mail:hqma@tju.edu.cn

Surface Activation and Graft of the Ultrafine PTFE Particles

LANG; Xu-qing; MA Hong-qin; TAN Xin; ZHU Hui-ming   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072
  • Received:2004-11-04 Revised:2004-12-14 Published:2005-07-15
  • Contact: MA Hong-qin E-mail:hqma@tju.edu.cn

摘要: 采用钠萘络合物化学腐蚀液对聚四氟乙烯(PTFE)超细颗粒表面进行活化, 对活化后的表面用氨基十一酸碳链进行化学接枝, 并用IR和XPS技术对活化及接枝前后颗粒的表面结构和价键状态进行了表征. 结果表明:活化后的PTFE超细颗粒表面上存在羟基、羰基、羧基等活性官能团, 并出现炭化现象;氨基十一酸的氨基能与表面羟基发生缩合反应, 并接枝于PTFE超细颗粒表面.

关键词: 聚四氟乙烯超细颗粒, 表面活化, 表面化学接枝, IR, XPS

Abstract: The surface of ultrafine polytetrafluoroethylene (PTFE) particles has been activated by sodium naphthalide solution. The 11-Aminoundecanoic acid [NH2(CH2)10COOH] molecules have been grafted on the activated PTFE particle surface. The activated and grafted PTFE particles have been characterized by infrared spectroscopy (IR) and X-ray photoelectron spectroscopy (XPS). The results show that the hydroxyl groups, carbonyl groups, and carboxyl groups are formed on the ultrafine PTFE particle surface after activated in sodium naphthalide solution. The hydroxyl groups are turned into carbonyl groups, and then to carboxyl groups with the increase of sodium naphthalide concentration and the activating time. The sodium naphthalide solution is effective in activating the ultrafine PTFE particle surface. The amidogens of 11-Aminoundecanoic acid molecules can react with the surface hydroxyl groups; as a result, the 11-Aminoundecanoic acid molecules can be anchored on the activated PTFE particles surfaces through chemical bonding.

Key words: Ultrafine PTFE prticles, Surface activation, Surface chemical graft, IR, XPS