Synthesis and characterization of some new thermally stable polyimides and copolyimides bearing bipyridine side-chain groups

Souri

2011

A new series of polyamides and co-polyamides were synthesized via reaction of a newly synthesized bipyridine containing diamine, 4,6-bis(4-aminophenyl)-2,2 -bipyridine, with commercial diacides. The synthesized polymers were characterized by FT-IR and 1 H-NMR spectroscopy. The physical properties of the polymers including solubility and viscosity were studied and the results showed acceptable solubility and good chain growth for the polymers. Thermal stability of these polymers was also studied by thermogravimetric analysis (TGA). The polymers start to lose weight because of thermal degradation at about 350 • C. From differential scanning calorimetry (DSC), the polymers showed a T g between 160 and 180 • C. The morphology of these polymers was also investigated by X-ray diffraction (XRD) and the results showed good crystallinity.

Section: Introductionmentioning

confidence: 90%

“…A bipyridine containing diamine, 4,6-bis(4-aminophenyl)-2,2 -bipyridine, was synthesized in four steps as described elsewhere [26].…”

Section: Monomer Synthesismentioning

confidence: 99%

Synthesis and Characterization of Some New Thermally Stable Crystalline Polyamides and Co-Polyamides Bearing Bipyridine Side-Chain Groups

Souri

2011

“…In continuation of our works on synthesis of pyridine-containing monomers via modified chichibabin synthesis and related polymers, [47][48][49] now we used a third route for synthesizing two new copolymers composed of thiophene and pyridine groups via coupling between a synthesized pyridine-containing dibromo compounds and bithiophene with diboronic ester substituents via Suzuki coupling.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and optical properties of poly[2-(4-(2,2′-bithiophen-5-yl)phenyl)-4-(4-alkoxyphenyl)-6-phenylpyridine]s

Fallah

Farnia

2013

Self Cite

Two new copolymers, P 1 and P 2 , composed of 4[4-(alkoxy)phenyl]-2, 6-bis(4-bromophenyl)pyridine and bithiophene units, have been synthesized via Suzuki cross-coupling reactions. 4[4-(alkoxy)phenyl]-2, 6-bis(4-bromophenyl)pyridines were synthesized starting from condensation reaction of 4-bromoacetophenone and 4-hydroxy benzaldehyde, and subsequent alkoxylation of hydroxyl groups. All of the polymers and intermediates were characterized using FTIR and NMR spectroscopies. The synthesized polymers exhibit good solubility in common organic solvents. The maximum absorption peak for P 1 and P 2 was 430 and 420 nm, respectively. The optical band gap energy of the polymers was determined by absorption onset and found to be 2.17 eV for P 1 and 2.13 eV for P 2 .

“…However, solubility is a very important factor, simplifying applications of polyimides. Recently, new polyimides and co-polyimides based on pyridine containing monomers were reported [32][33][34][35][36]. Both solubility and thermal stability of these polymers were good.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of New Disperse-Red Functionalized Polyimide for Use as Nonlinear Optical Material

2012

Self Cite

A new thermally-stable second-order nonlinear optical polyimide with side-chain second-order nonlinear optical (NLO) chromophore was synthesized. First a diamine functionalized azo chromophore (9) was synthesized and then polymerized by reaction with 4,4 -hexafluro isopropylidene-diphthalic anhydride. The synthesized polymer had a glass transition temperature of 215°C. The corona poling process of the NLOsubstituted polyimide was also studied in detail by measuring the second harmonic generation (SHG) from the polymer films. The second harmonic measurement indicate long-term stability of the dipole orientation (>500 h at 150°C) for this polyimide.