Kinetic investigations of formation of polyimides containing arylene sulfone ether linkages by potentiometric titration and their characterization

Comparative Kinetic Study and Microwaves Non-Thermal Effects on the Formation of Poly(amic acid) 4,4′-(Hexafluoroisopropylidene)diphthalic Anhydride (6FDA) and 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline (BAPHF). Reaction Activated by Microwave, Ultrasound and Conventional Heating

“…[ 44 ]. Poly(amic acid) formation is an intermolecular reaction which involves reactive group collisions and reaction, while imide formation is an intramolecular process which is much slower and requires higher activation energy than the former reaction [ 45 ], so Δ G a values for PAA formation, are lower than Δ G a values for imidization reaction of several polyimides, 67–101 kJ/mol, as reported by Yilmaz [ 46 ].…”

Comparative Kinetic Study and Microwaves Non-Thermal Effects on the Formation of Poly(amic acid) 4,4′-(Hexafluoroisopropylidene)diphthalic Anhydride (6FDA) and 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline (BAPHF). Reaction Activated by Microwave, Ultrasound and Conventional Heating

“…[ 44 ]. Poly(amic acid) formation is an intermolecular reaction which involves reactive group collisions and reaction, while imide formation is an intramolecular process which is much slower and requires higher activation energy than the former reaction [ 45 ], so Δ G a values for PAA formation, are lower than Δ G a values for imidization reaction of several polyimides, 67–101 kJ/mol, as reported by Yilmaz [ 46 ].…”

Thermal Imidization Kinetics of Ultrathin Films of Hybrid Poly(POSS-imide)s

“…In situ tracking of the imidization can be performed using TGA-MS, in situ infrared spectroscopy, and interferometry. − The resulting data can be used to study the reaction kinetics. Past studies on these reactions unanimously agree on a decelerating reactivity; ,− first-order reaction models − and diffusion models have both been proposed. Most of these studies were performed on bulk materials, but in many applications, the materials are used as thin films.…”

Synthesis and characterization of new unsymmetrical diamine monomer and polyimides

“…Polyimides (VIa-VIe) were prepared by the high temperature solution imidization reaction. [15,[24][25][26] The typical procedure adopted was as follows. To a stirred solution of PMDA Va (0.008 mol) in NMP (30 mL), diamine APNA (0.008 mol) was added under nitrogen atmosphere and stirred at room temperature for 12 h to get poly(amic acid).…”

Comparative Kinetic Study and Microwaves Non-Thermal Effects on the Formation of Poly(amic acid) 4,4′-(Hexafluoroisopropylidene)diphthalic Anhydride (6FDA) and 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline (BAPHF). Reaction Activated by Microwave, Ultrasound and Conventional Heating

“…[ 44 ]. Poly(amic acid) formation is an intermolecular reaction which involves reactive group collisions and reaction, while imide formation is an intramolecular process which is much slower and requires higher activation energy than the former reaction [ 45 ], so Δ G a values for PAA formation, are lower than Δ G a values for imidization reaction of several polyimides, 67–101 kJ/mol, as reported by Yilmaz [ 46 ].…”

Thermal Imidization Kinetics of Ultrathin Films of Hybrid Poly(POSS-imide)s

“…In situ tracking of the imidization can be performed using TGA-MS, in situ infrared spectroscopy, and interferometry. − The resulting data can be used to study the reaction kinetics. Past studies on these reactions unanimously agree on a decelerating reactivity; ,− first-order reaction models − and diffusion models have both been proposed. Most of these studies were performed on bulk materials, but in many applications, the materials are used as thin films.…”

Synthesis and characterization of new unsymmetrical diamine monomer and polyimides

“…Polyimides (VIa-VIe) were prepared by the high temperature solution imidization reaction. [15,[24][25][26] The typical procedure adopted was as follows. To a stirred solution of PMDA Va (0.008 mol) in NMP (30 mL), diamine APNA (0.008 mol) was added under nitrogen atmosphere and stirred at room temperature for 12 h to get poly(amic acid).…”

Comparative Kinetic Study and Microwaves Non-Thermal Effects on the Formation of Poly(amic acid) 4,4′-(Hexafluoroisopropylidene)diphthalic Anhydride (6FDA) and 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline (BAPHF). Reaction Activated by Microwave, Ultrasound and Conventional Heating

“…[ 44 ]. Poly(amic acid) formation is an intermolecular reaction which involves reactive group collisions and reaction, while imide formation is an intramolecular process which is much slower and requires higher activation energy than the former reaction [ 45 ], so Δ G a values for PAA formation, are lower than Δ G a values for imidization reaction of several polyimides, 67–101 kJ/mol, as reported by Yilmaz [ 46 ].…”

Thermal Imidization Kinetics of Ultrathin Films of Hybrid Poly(POSS-imide)s

“…In situ tracking of the imidization can be performed using TGA-MS, in situ infrared spectroscopy, and interferometry. − The resulting data can be used to study the reaction kinetics. Past studies on these reactions unanimously agree on a decelerating reactivity; ,− first-order reaction models − and diffusion models have both been proposed. Most of these studies were performed on bulk materials, but in many applications, the materials are used as thin films.…”

Synthesis and characterization of new unsymmetrical diamine monomer and polyimides

“…Polyimides (VIa-VIe) were prepared by the high temperature solution imidization reaction. [15,[24][25][26] The typical procedure adopted was as follows. To a stirred solution of PMDA Va (0.008 mol) in NMP (30 mL), diamine APNA (0.008 mol) was added under nitrogen atmosphere and stirred at room temperature for 12 h to get poly(amic acid).…”