Successful synthesis of a 1 : 1 salt monomer derived from bis(4-aminophenyl) ether and pyromellitic acid for direct polycondensation to an aromatic polyimide

This paper discusses the evolution observed in the field of high performance polymers and tries to forecast the future in different domains. The paper is divided into four sections: 1. From the 1960s to the 21st century. 2. What's new in chemistry and why? 3. What could be the future for high performance polymers in structural applications, electrical industries, electronic and electrooptical industries, membrane technologies, fuel cell membranes and other fields such as conductive polymers. 4. Concluding remarks.

Section: Solid State Condensationmentioning

confidence: 99%

“…Aliphatic aromatic copolyimides would be interesting candidates and a different synthetic pathway could be used: for example the copolymerization of an aliphatic diaminetetracarboxylic salt with an aromatic diamine-tetracarboxylic salt [30,31].…”

Section: Other Structural Applicationsmentioning

confidence: 99%

Aromatic and Heterocyclic Polymers—What Future?

Sillion

1999

“…Semi-aromatic PIs derived from nylon salt-type monomers composed of aliphatic diamine and aromatic tetracarboxylic acids or their diesters also exhibited good thermal and mechanical properties. [1][2][3][4] Some synthetic methods of semi-aromatic or wholly aromatic PIs using nylon salt-type monomers were prepared under high-pressure conditions, [4][5][6][7][8] by microwaveassisted polycondensation, 9 and by hydrothermal synthesis. 10 The nylon salt-type monomers were extremely reactive, producing PIs directly by solid-state polycondensation under high pressure in a very short reaction time at a temperature of around 250 C. 8 Recently, some PI particles were also prepared by dispersion polymerization, 11 solution polymerization, 12,13 and PI solution containing a polymeric stabilizer into a precipitant.…”

Section: Introductionmentioning

confidence: 99%

Preparation of aliphatic–aromatic polyimide particles by polycondensation of diethyl hexafluoroisopropylidenediphthalate and diaminooctane in ethylene glycol

Namikoshi

Odahara

Wakino

et al. 2014

Polycondensation of nylon salt-type monomer composed of diethyl hexafluoroisopropylidenediphthalate and diaminooctane was performed at 130°C in ethylene glycol to form confetti-shaped particles. Before the polycondensation, the salt monomer solution was homogeneous. As the polycondensation proceeded, the solution became turbid and polyimide particles grew to around 7 μm for 8 h. After the polycondensation, small particles precipitated and got deposited onto large particles to form confetti-shaped particles. Rod-shaped particles were also formed by the polycondensation at low monomer concentration in a long reaction time. They were found to be crystalline in form.

“…Semi-aromatic polyimides derived from nylon-salt-type monomers composed with aliphatic diamine and aromatic tetracarboxylic acids or their diesters also exhibited good thermal and mechanical properties. 1–4 Some synthetic methods of semi-aromatic or wholly-aromatic polyimides using nylon-salt-type monomers have been reported such as under high pressure condition 4–8 and by microwave-assisted polycondensation. 9…”

Section: Introductionmentioning

confidence: 99%

Preparation of aliphatic polypyromellitimide particles by polycondensation of nylon-salt-type monomers derived from aliphatic diamines with diethyl pyromellitate in ethylene glycol

Watanabe

Wakino

Namikoshi

et al. 2012

Polycondensations of nylon-salt-type monomers composed with diethyl pyromellitate and aliphatic diamines with various methylene lengths were performed at 130 °C in ethylene glycol to afford flower-like particles. Before the polycondensation, the salt monomer solution was homogenous. As the polycondensation proceeded, the solution became turbid and polyimide particles grew to around 15 µm in 8 h. Further polycondensation broke the particles into small pieces. The polyimide particles showed the distinctive odd-even effect of the methylene chain of diamine in both inherent viscosity and crystallinity. The polyimide particles using diamine with even-methylene length had higher crystallinity and lower inherent viscosity than those using diamine with odd-methylene length.