Polyimide−Ceramic Hybrid Composites by the Sol−Gel Route

Abstract

A number of polyimides have gained considerable importance as high-performance polymers during the last 2 decades primarily because of their excellent thermal stability and toughness. Some applications, however, require property enhancements and the desired improvements can often be obtained through incorporation of ceramic-like particles such as silica. Such hybrid inorganic−organic composites are frequently obtained using the in situ generation of the dispersed inorganic phase by the sol−gel technique. A number of studies have now been carried out on the preparation and characterization of such hybrid polyimide composites, and the purpose of this review is to give a brief account of the strategies used for this purpose and to describe some of the properties of the resulting composites.

Thermo-stabilized, porous polyimide microspheres prepared from nanosized SiO2 templating via in situ polymerization

“…As expected, one may notice that the thermal stability of porous spheres presented less lower than the other ones. It is natural since the thermal stability of inorganic moiety is higher than organic resins, the inclusion of the inorganic component will enhance the thermal stability of polymer [23,24]. Besides, when the inorganic component content was enough large, a duplex-continuous interpenetrating network had formed after in situ polymerization, hindering the movement of polymer molecules and enhancing the thermal conductivity.…”

Effect of nanosilica on the dielectric properties and thermal stability of polyimide/SiO2nanohybrid

“…One way of decreasing the extent of phase separation (increasing the miscibility) is by: (a) functionalizing the oligomers or polymer chains at their ends, (b) selecting polymers with appropriate groups within the repeat units, (c) involving co-monomers possessing appropriate functional groups, or (d) adding a coupling agent that can bond with both the growing inorganic oxide network and the PI chains [21][22][23][24][25][26][27][28][29][30].…”

Thermal and mechanical properties of chemically bonded aramid–silica nano-composites

“…Silica is considered as the most common inorganic component though many other metal oxides such as titania, boehmite, and zirconia have also been used to reinforce the organic polymers. Some of the important polymers used in preparation of hybrid materials in the recent past have been poly(dimethylsiloxane) [8][9][10][11], epoxies [12][13][14], poly(organophosphazenes) [15,16], polyacrylates [17][18][19], polyimides [20][21][22][23][24][25][26][27] and polyaramids [28][29][30][31][32] and polybenzoxazoles [33][34][35][36].…”