Changes of carbonyl and vinyl index of three plastics by outdoor exposure

Title
Changes of carbonyl and vinyl index of three plastics by outdoor exposure
Author(s)
송영경; 어소은; 홍상희; 심원준
KIOST Author(s)
Song, Young Kyoung(송영경)Eo, Soeun(어소은)Hong, Sang Hee(홍상희)Shim, Won Joon(심원준)
Publication Year
2017-09-27
Abstract
Three polymer types [low-density polyethylene (LDPE), polypropylene (PP) and expanded polystyrene (EPS)] were exposed to outdoor sun light in Korea for 12 months. The exposed polymers were sub sampled in every month and measured the carbonyl index (CI) and vinyl index (VI) which used to characterize the degree of photo-oxidation of polymer by FTIR-ATR. The CI and VI of PE showed a linear increase with UV exposure duration from 1.8 to 16.5 and 0.006 to 0.101, respectively. The CI of PP also increased, but has a jagged graph shape and the VI rapidly increased, reached a plateau after 3 months. In EPS, the CI increased until it reached at about 3 months (1.97), and then slowly increasing again. The VI of EPS increase to until it peaked at about after 6 months (2.67) and then slowly declined. When CI and VI was compared between outdoor and laboratory exposure, amount of outdoor sunshine is approximately 24% of UV chamber’. So the CI of PE (11.6), PP (0.76) and EPS (3.63) and VI of PP (0.16) and EPS (2.67) expose to UV in chamber for 4 months was similar to those (16.5, 0.70 and 2.97 for CI, and 0.13 and 2.33 for VI, respectively) in outdoor for 12 months. However, VI of PE exposed for 12 months in outdoor was 3.9 times higher than those in UV chamber for 4 months. CI and VI could be applied to field sample to assume that the degree of weathering of them in environment.l index (CI) and vinyl index (VI) which used to characterize the degree of photo-oxidation of polymer by FTIR-ATR. The CI and VI of PE showed a linear increase with UV exposure duration from 1.8 to 16.5 and 0.006 to 0.101, respectively. The CI of PP also increased, but has a jagged graph shape and the VI rapidly increased, reached a plateau after 3 months. In EPS, the CI increased until it reached at about 3 months (1.97), and then slowly increasing again. The VI of EPS increase to until it peaked at about after 6 months (2.67) and then slowly declined. When CI and VI was compared between outdoor and laboratory exposure, amount of outdoor sunshine is approximately 24% of UV chamber’. So the CI of PE (11.6), PP (0.76) and EPS (3.63) and VI of PP (0.16) and EPS (2.67) expose to UV in chamber for 4 months was similar to those (16.5, 0.70 and 2.97 for CI, and 0.13 and 2.33 for VI, respectively) in outdoor for 12 months. However, VI of PE exposed for 12 months in outdoor was 3.9 times higher than those in UV chamber for 4 months. CI and VI could be applied to field sample to assume that the degree of weathering of them in environment.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23809
Bibliographic Citation
PICES, pp.1, 2017
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
Related Researcher
Research Interests

Microplastic pollution,Persistent Organic Pollutants,Oil Pollution,미세플라스틱 오염,잔류성 유기오염물질,유류오염

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