Synthesis, characterization and rheological property of biphenyl-based polyarylene ether nitrile copolymers

Abstract

Abstract. The high molecular weight biphenyl-based polyarylene ether nitrile copolymers were synthesized by nucleophilic substitution reaction of 2,6-dichlorobenzonitrile (DCBN) with varying molar ratios of 4,4'-dihydroxybiphenyl (BP) and hydroquinone (HQ). The BP content of the copolymers has influence on glass transition temperature (Tg), initial decomposition temperature (Tid), mechanical properties and the crystallinity. All the copolymers could be dissolved in NMP, DMF and DMAc on heating, and were stable up to 450°C with a high char yield above 50% at 800°C in nitrogen atmosphere. The glass transition temperature, the melting temperature and tensile strength of copolymers were found to increase with increase in concentration of the BP units in the polymer. The dynamical viscosity and the storage modulus have been influenced by the BP concentration, frequency, temperature and time. This rheological results show that these copolymers have best thermoplastic processability and stability at 300-400°C.

Preparation and thermal properties of novel phthalonitrile oligomer containing biphenyl ethernitrile/bisphthalonitrile blends

“…The reaction mixture was refluxed at 160 C for 3h. 23 Then toluene was removed by distillation, and the system was cooled to room temperature. After cooling, 4-nitrophthalonitrile was added into the system, and the system was heated to 80-90 C and maintained for another 5 h. 10 Then the product was collected by filtration to remove anhydrous potassium carbonate; the filtrate was poured into 0.1 mol/L HCl solution with deionized water.…”

Synthesis and thermal properties of the thermosetting resin based on cyano functionalized benzoxazine

“…5e,f) and a new characteristic peak at 1520 cm À1 was observed (Fig. 5e,f), indicating the formation of triazine ring [20]. These thermally activated reaction characteristics show that polymerization could have happened.…”

Polymer-based composites with improved energy density and dielectric constants by monoaxial hot-stretching for organic film capacitor applications

“…Besides, MWCNTs can provide the potential of the nucleation site for the crystal polymers. Polyarylene ether nitriles(PEN), as a special thermoplastic engineering material, possesses various outstanding properties, including excellent mechanical properties, high thermal stability, radiation resistance and chemical inertia nature, etc [9][10][11] . These characteristics make it a good candidate to be used in industrial, automotive and outer space fields encountered with high temperature or high radiation exposure [12][13][14] .…”