Polymer/GO Nanocomposite Hydrogels

As a novel functional polymer materials, hydrogel with good environmentalfriendliness, water absorption, soft structure and biocompatibility and so on, have beenused widely in the catalysts, biomaterials, controlled drug release, tissue engineeringand other fields. However, conventional polymeric hydrogels are usually mechanicallyweak and unmultifunctional performance, limiting its application to some extent. Inrecent years, improving the mechanical properties of the hydrogel and expanding thefunctionality of the intelligent hydrogel have become a hot issue in the scientificcommunity. In this paper, polymer/inorganic nanocomposite hydrogels with highstrength was prepared, using oxide graphene (GO) as a multifunctional crosslinkingagent. The main work is as follows:1. Nanocomposite hydrogels with high mechanical strength were prepared via in-situfree-radical polymerization in graphene oxide aqueous suspension, using N,N-Dimethylacrylamide (DMA) as monomer, while inorganic GO and organic N,N-cystaminebisacrylamide (CBA) as co-cross-linker. Compared with traditionalchemical crosslinking hydrogels, nanocomposite hydrogels have excellent mechanicalproperties. The grafting efficiency of PDMA on the GO surface was measured, for thedisulfide bond of CBA can be fractured by reducing agent.2. A novel double-network nanocomposite hydrogels were prepared by two step freeradical polymerization in graphene oxide aqueous suspension, using N,N-dimethylacrylamide (DMA) as the first monomer, acrylic acid (AA) as the second monomer,inorganic GO and organic N,N-methylene double acrylamide (MBA) as co-cross-linker.In comparison with conventional chemically hydrogels, the GO nanocompositedouble-network hydrogel possesses excellent mechanical properties and pH sensitivity.3. GO nanocomposite intelligent hydrogels with high strength were prepared viain-situ oxidation-reduction method in graphene oxide aqueous suspension, using methylacrylic acid, N, N-dimethyl amino ethyl ester (DMAEMA) and acrylic acid (AA) as rawmaterials, inorganic GO and organic N,N-methylene double acrylamide (MBA) asco-cross-linker. Compared with the traditional intelligent hydrogels, GO nanocompositeintelligent hydrogels not only have high strength, but also have a pH (acid, alkali) sensitivity, temperature sensitivity, ionic strength sensitivity.