The surface degradation is a zero order reaction. The contact angles of water and formamide decreased to a minimum and then increased slowly. EPDM surface became redder, yellower and lighter in the first stage of aging and then remained almost unchanged. The results showed that hydroxyl, carbonyl and ester groups were formed during exposure to this artificial weathering environment. Furthermore, surface energy was calculated through contact angles of water and formamide. The change in surface color, contact angle and morphology was monitored by spectrophotometer, optical contact angle measuring device and Scanning Electron Microscope (SEM). The surface chemical changes were detected by Specular Reflection Fourier Transform Infrared (SR-FTIR) spectroscopy, Raman spectroscopy and X-ray Photoelectron Spectroscopy (XPS). Ethylene–propylene–diene monomer (EPDM) containing 5-ethylidene-2-norbornene (ENB) as diene was exposed to an artificial weathering environment produced by a xenon lamp light exposure and weathering equipment for different time periods.
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