中国塑料 ›› 2014, Vol. 28 ›› Issue (11): 20-24 .DOI: 10.19491/j.issn.1001-9278.2014.11.004

• 材料与性能 • 上一篇    下一篇

橡塑共混材料耐油耐热机理的SEM/XPS研究

彭辉1,李茁实邹红飞郝建薇2,杜建新1   

  1. 1. 北京理工大学2. 北京理工大学材料学院
  • 收稿日期:2014-05-29 修回日期:2014-08-18 出版日期:2014-11-26 发布日期:2014-11-26

Study of Oil/Heat Resistance Mechanism of Rubber-plastic Blends from SEM and XPS Analyses

  • Received:2014-05-29 Revised:2014-08-18 Online:2014-11-26 Published:2014-11-26

摘要: 采用乙烯-乙酸乙烯共聚物(EVA28)改性甲基乙烯基硅橡胶(MVQ),制备了拉伸强度及断裂伸长率优于MVQ、耐油及耐热性较好的橡塑共混材料(MVQ/EVA28);通过扫描电子显微镜(SEM)和X射线光电子能谱(XPS)对共混材料耐热耐油前后表面形貌、元素组成及其化学状态变化进行了表征,研究了耐油耐热机理。结果表明,耐油实验后,EVA组分吸油膨胀率高导致样品表面C元素增多,O及Si元素相对下降;耐热实验后,SiO2迁出使得材料表面C元素减少,O及Si元素相对增多;橡塑共混材料表面元素结合状态的变化及SiO2的迁出是影响其耐油耐热性能的因素。

关键词: 硅橡胶, 共混物, 耐油, 耐热, 扫描电子显微镜, X射线光电子能谱

Abstract: Rubber-plastic blends were prepared from methyl vinyl silicone rubber(MVQ) and ethylene-vinyl acetate copolymer(EVA28,VA content 28%). They were superior to neat MVQ in tensile strength and elongation at break and also have good oil/heat resistance. The changes of the morphology and the element compositions as well as their chemical state before and after the oil/heat resistance were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The oil/heat resistant mechanism of the blends was analyzed. XPS showed that C element increased while O and Si element decreased on the surface on resistance due to the high oil absorption expansion rate of EVA component. C element decreased while Si and O element increased on the surface on heat resistance test for the migration of SiO2 to the surface.

Key words: silicon rubber, blend, oil resistance, heat resistance, scanning electron microscopy, X-ray photoelectron spectros copy