1 research outputs found
Grafting of Polyimide onto Chemically-Functionalized Graphene Nanosheets for Mechanically-Strong Barrier Membranes
A series of polyimide (PI) nanocomposite
films with different loadings
of aminophenyl functionalized graphene nanosheets (AP-rGO) was fabricated
by in situ polymerization. AP-rGO, a multifunctional carbon nanofiller
that can induce covalent bonding between graphene nanosheets and the
PI matrix, was obtained through the combination of chemical reduction
and surface modification. In addition, phenyl functionalized graphene
nanosheets (P-rGO) were prepared by phenylhydrazine for reference
nanocomposite films. Because of homogeneous dispersion of AP-rGO and
the strong interfacial interaction between AP-rGO and the PI matrix,
the resulting nanocomposite films that contained AP-rGO exhibited
reinforcement effects of mechanical properties and oxygen barrier
properties that were even better than those of pure PI and the reference
nanocomposite films. In comparison to the tensile strength and tensile
modules of pure PI, the composite films that contained AP-rGO with
3 wt % loading were increased by about 106% (262 MPa) and 52% (9.4
GPa), respectively. Furthermore, the oxygen permeabilities of the
composites with 5 wt % filler content were significantly decreased,
i.e., they were more than 99% less than the oxygen permeability of
pure PI