Graphene Enhances the Shape Memory of Poly (acrylamide‐co‐acrylic acid) Grafted on Graphene

Abstract

Acrylamide and acrylic acid are grafted on graphene by free-radical polymerization to produce a series of graphene-poly(acrylamide-co-acrylic acid) hybrid materials with different contents of graphene. The materials demonstrate shape memory effect and self-healing ability when the content of graphene is in the range of 10%-30% even though poly(acrylamide-co-acrylic acid) itself had poor shape memory ability. The permanent shape of the materials can be recovered well after 20 cycles of cut and self-healing. The result is attributed to the hard-soft design that can combine nonreversible "cross-link" by grafting copolymer on graphene and reversible "cross-link" utilizing the "zipper effect" of poly(acrylamide-co-acrylic acid) to form or dissociate the hydrogen-bond network stimulated by external heating.

Improving autonomous self healing via combined chemical/physical principles

“…In order to further enhance mechanical properties as well as SM properties graphene sheets were incorporated to obtain graphenepoly(acrylamide-co-acrylic acid) hybrid materials [33]. When incorporating 10 e 30 wt% graphene, a self-healable hard-soft system, analogous to thermoplastic elastomers due to the "zipper effect" of a dynamic hydrogen-bonding network within the soft phase, was created.…”

Latest Improvements of Acrylic-Based Polymer Properties for Biomedical Applications

“…Thus, it has shown potential applications in nanocomposites such as magnetite-GNs/poly(arylene-ether-nitrile) nanocomposites because their mechanical properties were significantly enhanced by the incorporation of magnetite-GNs hybrids [44]. Besides, GN enhances the shape memory of poly(acrylamide-co-acrylic acid) and self-healing ability when the content of graphene is in the range of 10-30%, even though this copolymer itself has poor shape memory ability [45]. There are some reports that graphene oxide (GO) nanosheets can also enhance the mechanical strength of polymer substrates such as poly(acrylamide) (PAM) hydrogels [46].…”

Enhancing the specificity of polymerase chain reaction by graphene oxide through surface modification: zwitterionic polymer is superior to other polymers with different charges

“…35 First, 1 mL of 1 g mL −1 AA monomer was added to 50 mL of 1 mg mL −1 GO solution under vigorous stirring at room temperature. Under nitrogen purge for 30 minutes, 80 mg of (NH 4 ) 2 S 2 O 8 was added and heated at 70°C for 3 hours in an oil bath.…”