THE ODOR PERCEPTION OF KEY DEGRADATION PRODUCTS OF POLYAMIDE 6.6
AbstractPsychophysical research on indoor air has not focused on the odor of degradation productsof polymers in building materials, e.g. the polymer Polyamide 6.6. Three of its odorousdegradation products, cyclopentanone, pentanoic acid, and 2-methyl-pyridine, weremeasured in the form of single chemical compounds and their four mixtures. The results from15 participantsâ€™ scaling of perceived odor similarity and ranking of odor preference showedthat the cyclopentanone odor is masked by the other odor(s) of its mixtures. A new odorquality was formed when pentanoic acid and 2-methyl-pyridine were mixed. The threechemical compounds, thus, provided for four unique odor qualities, as revealed in a PCA.Moreover, the odor intensity ranks confirmed intermediacy of odor mixtures relative to thesesame four unique odor qualities. Our results confirm the importance of degradation productsof polyamide 6.6 as contributors to indoor air quality.