ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Study of the reaction kinetics in the aging of natural rubber by infrared spectrography. II. Effect of light

A. Tkáč and V. Kellö

Slovak Technical University, Bratislava

Abstract: Qual. changes in the infrared spectrum of raw rubber by exposing specimens 0.02-0.03 mm. thick to the light of a Hg-quartz lamp, are described. After a longer period of exposure to light, there is a new band at 5.66 μ, indicating aldehydic, ketonic (a band with the center 5.80-5.82 μ), and carboxyl groups. OH groups, present in untreated raw rubber at 2.98-2.96 μ, are increased by exposure to light, showing a new intensive band at 2.86 μ. With masticated rubber, a band is formed at 2.96 μ in the area of OH groups assocd. with H bridges, but the band belongs to unassocd. OH groups. By exposure to light, the C.dbd.O, O.sbd.H, and C.sbd.O groups are increased, the CH₂, CH₃, and isoprene groups are decreased, and C.dbd.C and a band at 10 μ are changed. Other factors affecting the aging of raw rubber by light are described. 61 references.

Full paper in Portable Document Format: 75-6a257.pdf (in Slovak)

Chemical Papers 7 (5-6) 257–288 (1953)