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The Variation of Structure and Physical Properties of XLPE during Thermal Aging Process  

이미영 (성균관대학교 응용화학부)
김철환 (전기전자컴퓨터 공학부)
구철수 (원자력 안전기술원)
김복렬 (원자력 안전기술원)
이영관 (성균관대학교 응용화학부)
Publication Information
Polymer(Korea) / v.27, no.3, 2003 , pp. 249-254 More about this Journal
Abstract
The variation of chemical structure and physical properties of crosslinked polyethylene (XLPE) during thermal aging process was investigated. The formation of carbonyl functional group resulting from thermal oxidation reaction of XLPE was monitored using X-ray photoelectron spectroscopy and near infrared (NIR) spectroscopy. It was observed that the intensity of carbonyl peak observed at 1715 nm linearly increased with aging time in NIR spectroscopy. The linear relationship between NIR peak absorbance and aging time confirmed that NIR spectroscopy might be used as a proper tool for monitoring the aging process of polymeric materials. Also the formation of crosslinks during the aging process was monitored using thermal mechanical analysis, stress-strain test, and Shore hardness test. The change in the physical properties, such as the increase in the glass transition temperature from 110 to 132$^{\circ}C$, the decrease in the strain from 265 to 110%, as well as the increase in the shore D hardness from 32 to 50, was observed during the aging process.
Keywords
XLPE; thermal aging; NIR; XPS;
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