Graphitic carbon nitride colloid as one photoinitiator for two-step polymerization
2022
Luo, Yufeng | Peng, Rui | Zhang, Hean | Cui, Qianling | Niu, Pingjian | Li, Lidong
Graphitic carbon nitride (g-C₃N₄), as a metal-free semiconductor, has been widely investigated in energy and photoelectric fields. In recent years, its excellent capacity as visible light-driven initiator for photopolymerization has also aroused increasing interests. In this work, g-C₃N₄ was explored to act as the sole photoinitiator in a two-step polymerization to prepare functional hybrid hydrogel. Firstly, poly(N-isopropylacrylamide) (PNIPAM) hydrogel was facilely obtained by free radical polymerization in the presence of g-C₃N₄ colloid and visible light. After adsorbing aniline monomer, the oxidative polymerization took place to get polyaniline (PAN) polymer in the network of g-C₃N₄/PNIPAM hydrogel, and the original g-C₃N₄ acted as the oxidative agents in the presence of oxygen. The obtained interpenetrating double network, g-C₃N₄/PNIPAM/PAN hydrogel, displayed an excellent photothermal effect irradiated by near-infrared (NIR) laser and good electrical conductivity. This work presents a green method to prepare functional hybrid hydrogel avoiding usage of excessive traditional molecular initiator in radical polymerization.
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