Infrared spectra of asphalts

Abstract

A procedure for preparing thin films of airblown asphalts and :L sp ect ro copi c s(udy of such film s t hrougho ut t he infrared region of 2.5 to 15 mi cron s are described. The relationship of tran smittance of several absorption bands wi th t h e dura bility of tbe asphal t is d is-cLi ssed. Exposure to ultrav iolet radiation produced changes in trans mittance a t four wavele ng ths wh ich , i n a series of aspbalts studied , showed statisticall y significant correlati ons wi th d urabili ty.