High Pressure Solid-State Synthesis of Poly(p-phenylene-1,2,4-oxadiazole) through 1,3-Dipolar Cycloaddition Polymerization of p-Cyanobenzonitrile N-Oxide

High pressure synthesis of newN,N-diphenyl-pendent aromatic ionene polymers fromN,N,N ′,N ′-tetraphenyl-m-xylylenediamine and aliphatic dihalides

“…[8] A mixture of 2.203 g (0.5 mmol) of 1, 1.641 g (0.5 mmol) of 2a, and 3 mL of acetonitrile was placed into a Teflon capsule (15 mm inside diameter and 20 mm inside depth). Then the capsule was loaded into the cylinder.…”

High-pressure synthesis and properties of aliphatic-aromatic polyimides via nylon-salt-type monomers derived from aliphatic diamines and benzophenonetetracarboxylic acid

“…Though also, in the case of the salt monomers with even-numbered hot-press with use of Teflon capsule as a reaction vessel as reported previously. 10 The polycondenmethylene units, the tendency toward thermal crosslinking increased with the increase in chain sations were conducted under 200-250 MPa at 200-320ЊC for 5 h, affording polyimides as light length, all of them could afford linear polymers by proper choice of the polymerization conditions, yellow solids.…”

“…High-pressure diamine-based polyimides (hereafter referred as aliphatic polyimides). [4][5][6][7] Edwards and Robinson 8 synthesis of the polyaddition-type aromatic polymers such as polyoxadiazole, 10 polyaminoimide, 11 first described the synthesis of aliphatic polyimides in 1955 by the melt polycondensation of the nylonpolycyanurates, 12 polydiazetidinediones, 13 and polyisocyanurates 14 have been studied in our laborasalt-type monomers derived from aliphatic diamines and aromatic tetracarboxylic acids or their tory. Three decades ago, Morgan and Scott 15,16 reported the high-pressure polycondensation of the diester acids.…”

New High Pressure Polymerization and Simultaneous Processing for Polyaminoimide from Aromatic Diamine and Bismaleimide

“…25, No. 8,1993 spectra with those of the authentic polyaminoimide obtained by the solution polymerization according to the previously reported procedure. 3 Figures 5 and 6 show the IR and IH NMR spectra, respectively, of both high pressure polymerized and solution polymerized polyaminoimides.…”

“…6 • 7 We already reported the application of high pressure to the cycloaddition polymerization of p-cyanobenzonitrile N-oxide and found that the solid state polymerization at room temperature giving poly-1,2,4-oxaziazole was accelerated under high pressure. 8 The present investigation was undertaken to explore high pressure polymerization and simultaneous processing for the polyaminoimide by the Michael-type polyaddition of 4,4' -bismaleimidodiphenylmethane (BMI) to 4,4'-methylenedianiline (MDI) without use of both solvent and catalyst [eq l]. …”