Global and Chinese Market of Polyphosphoric acid
(PPA, 85%), phosphorus pentoxide ([P.
was purchased from Spectrochem Pvt.
01 mol) were dissolved in 120 mL of 4M HCl solution, and then 100 mL polyphosphoric acid
was added and the mixture was stirred vigorously (1200 r/min) for 15 minutes under microwave irradiation condition (350 W).
Both the aliphatic-aromatic (II) and phosphorus oxynitride (V) residues can act as reinforcing material for the intumescent protective char made from the foamed viscous polyphosphoric acid
on the surface of burning composite.
There is growing demand for phosphates, and especially polyphosphoric acid
, from several sectors (pharmaceuticals, cosmetics, petrochemicals, road construction (asphalt), textiles, water treatment, fertilisers and others).
Typical examples of polyacid segments are polyphosphoric acid
, polyvinyl sulfonic acid and polyacrylic acid.
Several methods are available for the synthesis of oxazolones including the use of acetic anhydride, sodium acetate, lead acetate, polyphosphoric acid
, sulfur trioxide/dimethyl formamide complex, perchloric acid, and carbodiimides.
To achieve homogeneous dispersion of graphenes and strong interfacial bonding simple one step amine-functionalization of the pristine graphenes was performed via treating them in a solution of 4-aminobenzoic acid and polyphosphoric acid
Tavakoli- Hoseini, One-pot synthesis of 2-amino-3-cyano- 4-arylsubstituted tetrahydrobenzo[b]pyrans catalysed by silica gel-supported polyphosphoric acid
(PPASiO2) as an efficient and reusable catalyst, Chem.
2,5-Bis(p-aminophenyl)-l,3,4-oxadiazole was prepared by the reaction of the p-aminobenzoic acid with hydrazine hydrate in polyphosphoric acid
according to a published procedure , 2,5-Bis[4-(p-aminophenoxy)-phenylene]1,3,4-oxadiazole and 2,5-bis[3-(p-aminophenoxy)-phenylene]-l,3,4-oxadiazole were synthesized starting from 4-fluorobenzoic acid and hydrazine hydrate, which first reacted in polyphosphoric acid
and produced 2,5-bis (p-fluorophenyl)-l,3,4-oxadiazole.