Journal
ACS OMEGA
Volume 6, Issue 51, Pages 35600-35606Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.1c05354
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Funding
- Research Startup Fund of Zhejiang Sci-Tech University [19012097-Y]
- Basic Public Welfare Research Project of Zhejiang Province [LGF21E030004]
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A self-lubricating hydrogel filament was successfully achieved using a blue-light photopolymerization system with CQ/DPI as photoinitiators, AM/DMAA as monomers, PEGDA as a cross-linker, and lecithin as a lipid lubricant. The physical cross-linking effect between lecithin and the poly(DMAA/AM) network improved the polymerization properties and elasticity, while a lipid-based boundary layer at the hydrogel surface contributed to its self-lubrication. The extruded hydrogel filaments showed excellent mechanical properties and weavability, making them suitable for applications in soft robotics and bioengineering.
A self-lubricating hydrogel filament was achieved by establishing an in situ photocuring system and using camphorquinone/diphenyl iodonium hexafluorophosphate (CQ/DPI) as the blue-light photoinitiators, acrylamide (AM) and N,N-dimethylacrylamide (DMAA) as the monomers, polyethylene glycol diacrylate (PEGDA) as the cross-linker, and lecithin as the lipid lubricant. The blue-light photopolymerization efficiency and the photorheological properties of the hydrogel precursor were investigated by photodifferential scanning calorimetry and a photorheological system. With the increase of DMAA, the photopolymerization efficiency of the precursor improved, while the elasticity of poly(DMAA/AM) decreased accordingly. The physical cross-linking effect between lecithin and the poly(DMAA/AM) network led to improved polymerization properties and elasticity. The lipid-based boundary layer at the hydrogel surface endowed the self-lubrication of the hydrogel filament. The extruded hydrogel filaments exhibited excellent mechanical properties and weavability, which were expected to play a realistic role in soft robots and bioengineering.
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