Mechanically Strong and Multifunctional Polyimide
Nanocomposites Using Amimophenyl Functionalized Graphene Nanosheets
- Publication date
- Publisher
Abstract
We report an effective way to fabricate
mechanically strong and
multifunctional polyimide (PI) nanocomposites using aminophenyl functionalized
graphene nanosheet (APGNS). APGNS was successfully obtained through
a diazonium salt reaction. PI composites with different loading of
APGNS were prepared by <i>in situ</i> polymerization. Both
the mechanical and electrical properties of the APGNS/PI composites
were significantly improved compared with those of pure PI due to
the homogeneous dispersion of APGNS and the strong interfacial covalent
bonds between APGNS and the PI matrix. The electrical conductivity
of APGNS/PI (3:97 w/w) was 6.6 × 10<sup>–2</sup> S/m which
was about 10<sup>11</sup> times higher than that of pure PI. Furthermore,
the modulus of APGNS/PI was increased up to 16.5 GPa, which is approximately
a 610% enhancement compared to that of pure PI, and tensile strength
was increased from 75 to 138 MPa. The water vapor transmission rate
of APGNS/PI composites (3:97 w/w) was reduced by about 74% compared
to that of pure PI