Ageing of low-temperature coal-tar pitch
✍
Jürg E. Rüede
📂
Article
📅
1979
🏛
Elsevier Science
🌐
English
⚖ 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