Preparation And Properties Of Polyer/Graphene Oxide Nanocomposite Hydrogels

Hydrogels have good water retention, biocompatibility and certain mechanical strength. However, the traditional hydrogels are limited in application scope because of their low mechanical properties and heterogeneous crosslinking density. The polymer/graphene oxide nanocomposite has a bright prospect in the field of solar cells, super capacitors, electronic memory, sensors, biomaterials and so on, due to its excellent mechanical, electrical conductivity, thermal stability and gas barrier properties. In recent years, more and more papers are reported about high strength hydrogels using graphene oxide (GO) as inorganic nanofiller, guiding a new wave of research. In this paper, polymer/graphene oxide nanocomposite hydrogels with multifunctional and high strength were prepared, using GO as physical cross-linking agent. The main work is as follows:1. The physically crosslinked polyvinyl alcohol/graphene oxide (PVA/GO) nanocomposite hydrogel was prepared by a freeze-thaw method. Due to the strong hydrogen bonds formed between PVA and GO, compared with pure PVA hydrogels, nanocomposite hydrogels have excellent mechanical properties and thermal stability, also have ionic strength sensitivity.2. The polyvinyl alcohol/polyacrylic acid/graphene oxide (PVA/PAA/GO) nanocomposite hydrogel was prepared in GO aqueous solution, using N, N-methylene-bis-acrylamide (BIS) and inorganic GO as co-crosslinker, ammonium persulfate (APS) as initiator. The results confirmed that the composite hydrogel exhibited a cross-linked network, with high strength, high elasticity, environmental (pH, temperature, ionic strength) sensitivity.3. The PAM/PMAA/GO nanocomposite hydrogel was prepared by free radical copolymerization of acrylamide (AM) and methacrylic acid (MAA) in the GO aqueous solution, using BIS and GO as co-crosslinker, APS as initiator. Compared with the traditional hydrogels, nanocomposite intelligent hydrogels not only has high strength, also has a pH sensitivity, ionic strength sensitivity and good drug release property.