三元乙丙橡胶的人工气候老化  

Artificial weathering of ethylene-propylene-diene monomer (EPDM) rubber

作　　者：赵泉林[1,2] 李晓刚[1,2] 高瑾[1,2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京市腐蚀、磨蚀与表面技术重点实验室,北京100083

出　　处：《北京科技大学学报》2008年第12期1422-1427,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金重点资助项目(No.50533060);国家自然科学基金资助项目(No.50571013);国家科技基础条件平台建设项目(No.2005DKA10400)

摘　　要：利用氙灯人工气候箱对三元乙丙橡胶(EPDM)进行人工气候老化实验,采用X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、电子万能试验机和色度计研究了人工气候老化对EPDM化学结构、表面形貌、力学性能和颜色的影响.结果表明:在氙灯人工气候环境中老化90d后,EPDM表面生成一层厚度约2μm的氧化膜,其组成包括有C—O—C/C—OH、CO和O—CO;交联密度随老化时间的变化基本呈线性增加;随老化时间的延长,试样表面粗糙度增加,有孔洞和微裂纹生成,拉伸强度、撕裂强度和硬度增加,EPDM试样表面变红变黄,亮度增加.The effects of artificial weathering on the chemical structure, surface topography and mechanical properties of ethylenepropylene-diene monomer （EPDM） were investigated by X-ray photoelectron spectroscopy （XPS）, scanning electron microscope （SEM）, computer-controlled testing machine and spectrophotometer. The results showed that an oxidation layer formed after 90 d of exposure. XPS results confirmed the production of C-O-C/C-OH, C =O and O-C =O groups. With prolonging exposure time, the crosslink density increased linearly, the surface of EPDM turned to redder, more yellow and lighter. Little voids and micro cracks were formed under exposure to artificial weathering environment. The tensile strength, tear strength and hardness increased with prolonging exposure time.

关 键 词：三元乙丙橡胶 人工气候老化 化学结构 表面形貌 力学性能 

分 类 号：TQ333.4[化学工程—橡胶工业]