Ageing of low-temperature coal-tar pitch
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JΓΌrg E. RΓΌede
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Article
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1979
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Elsevier Science
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English
β 377 KB
Outdoor weathering or exposure to U.V. light causes chemical changes on the surface of pitch which can be studied with infrared spectroscopy. Several changes -increase of oxygen content and aromaticity -take place at the same time but at different rates. Carbonyl groups are formed considerably faste