Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 4, Pages 2252-2258Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b01734
Keywords
Sepia eumelanin; Poly(vinyl alcohol); UV-shielding; Photostability
Categories
Funding
- National Natural Science Foundation of China [51373070]
- Program for New Century Excellent Talents in University [NCET-12-0884]
- Chinese Ministry of Education [113034A]
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Sepia eumelanin (SE), a biomacromolecule, was developed to prepare the excellent UV-shielding polymer material with better photostability. UV-vis transmittance spectra showed that poly(vinyl alcohol) PVA/SE film blocked most ultraviolet light below 300 nm even with a low concentration of SE (0.5 wt %), which still kept its high transparency in the visible spectrum. Rhodamine B photo degradation measurement further confirmed the excellent UV-shielding properties of PVA/SE film. FTIR indicated that the carbonyl absorption bands resulting from phtodegradation for PVA/SE film did not change after UV exposure for 2700 h. The tensile properties of neat PVA were deceased intensely after UV irradiation; however, those of PVA/SE film were reduced a little. Moreover, AFM indicated that the surface roughness of PVA/SE film was much lower than that of a neat PVA one. It could be concluded that SE reduced the PVA degradation rate dramatically, revealing enhanced photostability of PVA/SE film. The mechanism for outstanding UV-shielding properties and photostability of PVA/SE film was illuminated, based on the formation of charge transfer complexes (CTCs) between SE and PVA, photothermal conversion, and the well-known radical scavenging capabilities of SE.
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