Hybrid Hydrogels Toughened by Chemical Covalent Bonding and Physical Electrostatic Interactions

doi:10.1007/s40242-018-7375-z

Abstract

Abstract: Polystyrene nanoparticles with negative charges(n-PSs) were synthesized using styrene(St) and sodium styrene sulfonate(NaSS) as initial materials by surfactant-free emulsion polymerization. Subsequently, a hybrid hydrogel was prepared using acrylamide(AAm) and methacryloyloxyethyltrimethyl ammonium chloride(DMC) as co-monomers with N,N'-methylenebisacrylamide(MBA) as a chemical crosslinker and n-PSs as a physical electro-static interaction agent. The resulting hybrid hydrogels exhibited excellent tensile strength and elongation at break. The tensile stress of hybrid hydrogels was seven times greater than that of hydrogels without n-PSs. The elongation at break of hydrogels reached 700%, which was much higher compared to those of the hydrogels without n-PSs. Furthermore, swelling measurements of the hydrogels indicate that there is an overshoot in the swelling process and the extent of overshoot decreases with the increasing n-PSs. Therefore, the work presented here provides a method for improving the mechanical properties of hydrogels via the introduction of polymeric nanoparticles.

Key words: Hydrogel, Electrostatic interaction, Mechanical property, Swelling property

LIU Li, PAN Ge, WANG Licheng, REN Xiuyan, ZHANG Xinyue, WU Guangfeng. Hybrid Hydrogels Toughened by Chemical Covalent Bonding and Physical Electrostatic Interactions[J]. Chemical Research in Chinese Universities, 2018, 34(3): 500-505.

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