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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)

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