Characterization on the Ozone Oxidation of Raw Natural Rubber Thin Film using Image and FT-IR Analysis

Kim, Ik-Sik; Lee, DooYoul; Sohn, Kyung-Suk; Lee, Jung-Hun; Bae, JoongWoo

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자료유형: 학술저널

저자정보: Kim, Ik-Sik (Aero Technology Research Institute, ROKAF) Lee, DooYoul (Aero Technology Research Institute, ROKAF) Sohn, Kyung-Suk (Aero Technology Research Institute, ROKAF) Lee, Jung-Hun (Aero Technology Research Institute, ROKAF) Bae, JoongWoo (Aero Technology Research Institute, ROKAF)

저널정보: 한국고무학회 Elastomers and composites 엘라스토머 및 콤포지트 제54권 제2호

발행연도: 2019.1

수록면: 110 - 117 (8page)

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The characterization of the ozone oxidation for raw natural rubber (NR) was investigated under controlled conditions through image and fourier transform infrared (FT-IR) analysis. The ozone oxidation was performed on a transparent thin film of raw NR coated on a KBr window in a dark chamber at $40^{\circ}C$ under low humidity conditions to completely exclude thermal, moisture, or light oxidation. The ozone concentration was set at 40 parts per hundred million (pphm). Before or after exposure to ozone, the image of the thin film for raw NR was observed at a right or tilted angle. FT-IR absorption spectra were measured in the transmission mode according to ozone exposure time. The ozone oxidation of NR was determined by the changes in the absorption peaks at 1736, 1715, 1697, and $833cm^{-1}$, which were assigned to an aldehyde group (-CHO), a ketone group (-COR), an inter-hydrogen bond between carbonyl group (-C=O) from an aldehyde or a ketone and an amide group (-CONH-) of protein, and a cis-methine group ($is-CCH_3=CH-$, respectively. During ozone exposure period, the results indicated that the formation of the carbonyl group of aldehyde or ketone was directly related to the decrement of the double bond of cis-1,4-polyisoprene. Only carbonyl compounds such as aldehydes or ketones seemed to be formed through chain scission by ozone. Long thin cracks with one orientation at regular intervals, which resulted in consecutive chain scission, were observed by image analysis. Therefore, one possible two-step mechanism for the formation of aldehyde and ketone was suggested.

#Ozone Oxidation #Natural Rubber #FT-IR #Image #Chain Scission #Analysis

참고문헌 (21)

참고문헌 신청

G. van Santvoort / 1994 / Geotextiles and Geomembranes in Civil Engineering / A.A. Balkema :517~518

J. S. Dick / 2001 / Rubber Technology: Compounding and Testing for Performance / Hanser :64

K. Muniandy / 2012 / Studies on Natural Weathering of Rattan Powder-filled Natural Rubber Composites / Bioresources 7:3

F. Cataldo / 2010 / Surface Oxidation of Rubber Crumb with Ozone / Polymer Degradation and Stability 95:5

G. Zaikov / 2012 / Ozone and its Reaction with Diene Rubbers / Rubber Chemistry and Chemical Technology 6:3

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