Flammability and degradation characteristics of styrene–butadiene rubbers

✍ Scribed by R. H. Kratzer; K. L. Paciorek; J. Kaufman; J. H. Nakahara; A. M. Hartstein

• Publisher: John Wiley and Sons
• Year: 1977
• Tongue: English
• Weight: 438 KB
• Volume: 21
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1977.070210807

✦ Synopsis

Abstract

Uncured styrene–butadiene gum, a known cured composition, and four SBR beltings used in underground coal mining were subjected to thermal oxidative degradation in static and dynamic systems. The room temperature volatiles produced under the static conditions at 370°C were identified and quantitated. Monomers and their interaction products were liberated by the raw gum; the cured composition formed together with the above products materials traceable to the curing ingredients. The four beltings gave a large spectrum of products; an attempt was made to correlate these with possible components used in belts manufacture. In the dynamic system, the occurrence of glow, the rate of smoke generation, and char yields were determined at 400°C and 500°C. None of the materials glowed at 400°C. At 500°C, the raw gum volatilized completely, and the cured rubber and two beltings glowed. One of the beltings, which failed to glow, liberated the smallest quantity of toxic products.