One-step Preparation of High-strength and Self-healing Poly (Acrylic Acid)/Poly (Allyl Amine) Hydrogels
LAN Jun1, LIU Qiao2, CHEN Chongyi1
1 College of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211 2 School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315016
Abstract: Poly (acrylic acid)/poly (allyl amine) (PAAc/PAH) hydrogels were prepared via one-step free radical polymerization and characterized by mechanical testing and rheometer. The results indicated that multiple ionic bonds including strong and weak interaction were formed between the carboxyl groups of poly (acrylic acid) and the amino groups of poly (allyl amine). The weak ionic interaction breaks to dissipate the energy generated during the hydrogels stretching, consequently, the PAAc/PAH hydrogels exhibit excellent mechanical strength and toughness. The reversible ionic bonding also endows PAAc/PAH hydrogels with quick self-healing ability. The addition of counter-ions weakens the electrostatic interactions between polyelectrolytes to impair the strength of hydrogels, and the hydrogels can be recover to original mechanical properties after removing the counter-ions via dialysis. Therefore the cut hydrogels can be healed effectively by usage of saline and recovered to relatively high mechanical strength and toughness.
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