Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 304, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201800500
Keywords
g-C3N4 nanosheets; hydrogels; photo-polymerization; UV protection
Funding
- Zhejiang Provincial Natural Science Foundation of China [LY17B010004, LY17B050007]
- 521 talent project of ZSTU
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Composite hydrogels of graphitic carbon nitride nanosheets (CNNS) and polyacrylamide (PAM) with superior UV absorption and visible transparence capabilities are reported. CNNS is employed not only as a photocatalytic initiator to trigger the polymerization of acrylamide, but also as a cross-linker to 3D connected PAM chains via hydrogen bonds. The obtained CNNS/PAM hydrogels are highly moldable for preparing various forms, and have good mechanical properties, self-healing ability, and photo-stability. Furthermore, the composite hydrogels have a wide spectral range for UV absorption compared to conventional UV protective materials. Besides the complete screening of UVB (280-315 nm) in sun radiation, the CNNS/PAM hydrogel film can also filter >95% UVA radiation (315-400 nm) by regulating the coating thickness, meanwhile retaining a high visible transmittance. Therefore, the CNNS/PAM hydrogels have potential applications for shielding UV radiation. Additionally, this strategy provides a common and facile route to fabricate functional composite hydrogels via photo-induced polymerization.
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