Improving mechanical, thermal, and electrical properties of polyimide by incorporating vinyltriethoxysilane functionalized graphene oxide

Abstract

Functionalized graphene oxide (FGO) nanosheets were produced by reacting graphene oxide with vinyltriethoxysilane (VTES). The vinyltriethoxysilane graphene oxide and polyimide (VGO/PI) composites were prepared by solution blending method. In comparison with the pristine polyimide (PI) and graphene oxide/polyimide (GO/PI) composite, VGO showed better mechanical, electrical and thermal properties. The tensile strength of VGO/PI composite with 0.8 wt% VGO loading was up to 148 MPa, i.e., 105% higher than that of pure PI. The respective electrical and thermal conductivity values of composite were found 2.15 × 10−3 S/m and 0.89 W/mK as compared to 1.21 × 10−12 S/m and 0.13 W/mK for the pure PI. The thermal stability of composite was found to improve with the addition of VGO. Significant improvement in the properties has been explained in terms of homogeneous dispersion of VGO in the matrix and its strong interfacial adhesion with polymer due to surface modification of GO. POLYM. COMPOS., 39:E1635–E1642, 2018. © 2017 Society of Plastics Engineers

Water‐soluble graphene oxides grafted by polyanilines

“…The results indicate that the electric conductivities of the composites depended on the electric properties of the polymer chain. It has been reported that GO is considered as a nonconductive material 12 . The lower σ value of GO‐AP‐PAN/PANPrSO 3 H corresponds to the low content of self‐doped PANPrSO 3 H unit in the composite.…”

Double‐Layer Nacre‐Inspired Polyimide‐Mica Nanocomposite Films with Excellent Mechanical Stability for LEO Environmental Conditions

“…In addition, the strength and modulus of the single-layer PI-Mica film are superior to those of other PI-based composite films (Figure 2e and Table S1, Supporting Information). [15,28,[31][32][33][34][35][36][37][38][39][40][41] The improvement in the mechanical properties of the final singlelayer PI-Mica film is mainly attributed to its ordered and uniform layered microstructure. [42,43] However, we found that after tensile failure in single-layer PI-Mica films, many of the mica nanosheets were pulled out from the PI matrix at the fracture location, forming prominent trapezoidal structures and irregular deflections (Figure S4b-f, Supporting Information).…”

In situ polymerization of graphene-polyaniline@polyimide composite films with high EMI shielding and electrical properties

“…The improvement in mechanical properties can be primarily ascribed to the homogeneous dispersibility of Gr-PANI 10:1 in PI matrix because of the “non-covalent welding” strategy. 39 …”