Characterization of the UV Oxidation of Raw Natural Rubber Thin Film Using Image and FT-IR Analysis

Kim, Ik-Sik; Lee, Bok-Won; Sohn, Kyung-Suk; Yoon, Joohoe; Lee, Jung-Hun

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자료유형: 학술저널

저자정보: Kim, Ik-Sik (Aero Technology Research Institute, ROKAF) Lee, Bok-Won (Aero Technology Research Institute, ROKAF) Sohn, Kyung-Suk (Aero Technology Research Institute, ROKAF) Yoon, Joohoe (Aero Technology Research Institute, ROKAF) Lee, Jung-Hun (Aero Technology Research Institute, ROKAF)

저널정보: 한국고무학회 Elastomers and composites 엘라스토머 및 콤포지트 제51권 제1호

발행연도: 2016.1

수록면: 1 - 9 (9page)

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Characterization of the UV oxidation for raw natural rubber (NR) was investigated in controlled conditions through image and FT-IR analysis. The UV oxidation was performed on a thin film of natural rubber coated on a KBr window at 254 nm and room temperature to exclude the thermal oxidation. Before or after exposure to UV light, image of the NR thin film was observed at a right or tilted angle. FT-IR absorption spectra were measured in transmission mode with the UV irradiation time. The UV oxidation of NR was examined by the changes of absorption peaks at 3425, 1717, 1084, 1477, 1377, and $833cm^{-1}$ which were assigned to hydroxyl group (-OH), carbonyl group (-C=O), carbon-oxygen bond (-C-O), methylene group $(-CH_2-)$, methyl group $(-CH_3)$, and cis-methine group $(cis-CCH_3=CH-)$, respectively. During the initial exposure period, the results indicated that the appearance of carbonyl group was directly related to the reduction of cis-methine group containing carbon-carbon double bond (-C=C-). Most of aldehydes or ketones from carbon-carbon double bonds were formed very fast by chain scission. A lot of long wide cracks with one orientation at regular intervals which resulted in consecutive chain scission were observed by image analysis. During all exposure periods, on the other hand, it was considered that the continuous increment of hydroxyl and carbonyl group was closely related to the decrement of methylene and methyl group in the allylic position. Therefore, two possible mechanisms for the UV oxidation of NR were suggested.

#UV oxidation #natural rubber #FT-IR #image #chain scission

참고문헌 (18)

참고문헌 신청

G. Van Santvoort / 1994 / Geotextiles and Geomembranes in Civil Engineering :517

J. L. Morand / 1977 / Chain Scission in the Oxidation of Polyisoprene / Rubber Chem. Technol 50:373

K. A. M. dos Santos / 2005 / Photo-degradation of Synthetic and Natural polyisoprene at Specific UV radiations / Polym. Degrad. Stab 90:34

M. A. Rodrigues / 1985 / The Chemical effects of Photo-oxidation on Isoprene Rubber / Eur. Polym. J 21:15

J. L. Morand / 1966 / Photodegradation of Rubber / Rubber Chem. Technol 39:537

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