(Co)polyimides from commonly used monomers, and their nanocomposites

Fabrication of the porous polyimide film as a matrix of the composite membrane of the direct methanol fuel cell

“…As a last measure to improve the strength, co-polyimide film was synthesized in this work by choosing PPDA and ODA as co-diamine source. It is reported by Huang et al [5] that the film of SBPDA-PPDA/ODA had a 35% higher ultimate strength and a 64% higher elongation at break at the ambient temperature than the reference polyimide (SPBDA-PPDA), and also retained the strength and exhibited a 200% higher elongation at a temperature of 200 • C. Fig. 4 shows the FTIR spectra of the films after treatment at 100 • C and 350 • C respectively.…”

“…The molar ratio of SPBDA, PPDA, and ODA was 1:0.75:0.25 respectively and total solid content of monomers was calculated to be 18 wt%. Polymerization reaction was carried out in nitrogen environment at a temperature of 10 • C with vigorous stirring for 48 h to obtain a polyamic acid solution [5].…”

“…We proposed using of the porous polyimide film as a microporous matrix. We believe it is a good candidate for making a multifunctional composite membrane because of the following reasons [4,5]: (a) this material has high mechanical strength; (b) as the major component of the porous structure is still hydrophilic polyimide material, it is compatible with filling electrolyte, e.g. Nafion ionomer.…”

Fabrication of high-performance copolyimide fibers from 3,3',4,4'-biphenyltetracarboxylic dianhydride, p-phenylenediamine and 2-(4-aminophenyl)-6-amino-4(3H)-quinazolinone

“…Aromatic polyimide (PI) fibers have been recognized as one of the important members in the family of high-performance polymeric fibers that can be widely used in high performance composites since the PI possesses remarkably valuable properties, such as excellent mechanical and dielectric properties, outstanding thermal stability, and good chemical and irradiation resistances [1][2][3][4].…”

Improved mechanical and electrical properties in electrospun polyimide/multiwalled carbon nanotubes nanofibrous composites

“…[7][8][9][10][11][12] Due to its high modulus and strength, excellent thermal stability, and dielectric properties, polyimide (PI) has been considered to be a high performance engineering material and used as adhesives, dielectrics, and membrane materials. [13][14][15][16][17] The electrospun PI nanofibers have been investigated in terms of their microstructure and intrinsic properties. In order to improve its mechanical properties, PI has also been electrospun with inorganic fillers to prepare nanofiber composites.…”