Aging Behavior of the Polyether Polyurethane Films Irradiated by UV

Hai Yan Wang; Yu Wen Liu; Bin Sun; Shi Jie Huang; Ji Feng Tian

doi:10.4028/www.scientific.net/AMR.748.16

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 748Aging Behavior of the Polyether Polyurethane Films...

Aging Behavior of the Polyether Polyurethane Films Irradiated by UV

Abstract:

The failure behavior of polyether polyurethane films irradiated by UV depends on its molecular structures evolvement. The molecular structure evolvement of the polyether polyurethane films under UV irradiation were studied by in-situ FTIR spectra in this paper. It has been found that some oxygen contained groups such as hydroxyl group and carbonyl group increase; on the contrary, ether bond and CH₂ decrease with the UV irradiation time. The aromatic ring maintains changeless. However, -NH group has not be determined due to the interference of the-OH and O-C=O. Results from FTIR and SEM have shown that UV photodegradative processes participated by oxidization occur mostly in ether segments and is accompanied by crosslinkage. Using the absorbance band of aromatic ring as the base the service life of polyether polyurethane can be determined by the change rate of C-O-C and-CH₂ during UV irradiation. After UV irradiation, the polyether polyurethane film has higher color difference value and lower UV light transparence.

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Periodical:

Advanced Materials Research (Volume 748)

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16-21

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.748.16

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Online since:

August 2013

Authors:

Hai Yan Wang, Yu Wen Liu, Bin Sun, Shi Jie Huang, Ji Feng Tian

Keywords:

Aging, Polyurethane (PU), Uv Irradiation

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