The evolution of toxic gases from heated polymers—III. Isocyanate products

✍ Scribed by D.W. Skidmore; P.R. Sewell

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 329 KB
• Volume: 11
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(75)90137-8

✦ Synopsis

Attempts have been made to measure the amount of toluene di-isocyanate evolved from flexible polyurethane foam heated at temperatures in the range from 200 to 470'. This study involved heating a sample of about 2 g in a stream of air in a furnace followed by titration of the isocyanate fumes trapped in an absorber. Further investigation concerning the identity of the isocvanate species was also made using chromatographic and spectroscopic techniques. Most of the products which are isocyanate-active appear to be oligomeric ureas having isocyanate end groups. The amount of titratable isocyanate varied from 0.7 to 1.6°0 w/w calculated as toluene di-isocyanate, and the free toluene di-isocyanate is considered not to exceed 0.02-0.04% (w/w).