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Table Development of Polyphosphoric acid Manufacturing Technology
Figure Manufacturing Process of Polyphosphoric acid
Table Trends of Polyphosphoric acid Manufacturing Technology
The carboxylic acid in the virgin polymer is successfully converted to benzimidazole pendants via polyphosphoric acid condensation route.
Poly(1,3,4-oxadiazole-ether)s with pendant benzimidazole units were synthesized and characterized; it was demonstrated that good thermally stable polymeric stuff can be synthesized from the pendant carboxylic acid functional poly(1,3,4-oxadiazole-ether) (VALPOx); reactive pendant carboxylic acid group is exploited to hold the benzimidazole moieties, by polyphosphoric acid condensation.
Pristine graphenes were prepared from graphite powder by chemical method and the amine-functionalized graphenes were prepared successfully via treating them with 4-aminobenzoic acid in polyphosphoric acid
. Using the functionalized graphenes, epoxy/graphene nanocomposites with 1 phr of graphenes were prepared, and their curing behavior and physical properties were investigated.
, phosphorus oxide, concentrated sulfuric acid, and acetic acid were supplied by Beijing Modern Eastern Fine Chemical Co.
In particular, polyphosphoric acids combine high reactivity, accessibility, and low cost that are of particular interest.
The esters of cellulose and inorganic polyacids were prepared by the phosphorylation in the melt of carbamide and polyphosphoric acids at temperatures in the range 145-160 [degrees] C.
Therefore, we have investigated conditions of esterification of cellulose in water solutions of carbamide mixed with polyphosphoric acids.
Determination of structural orientation of cellulose esterification by condensed phosphates using the method of mesylation (i.e., interaction with C[H.sub.3]S[O.sub.2]Cl) of groups free from phosphorylation with further interaction with potassium iodide showed that the process proceeds in primary alcoholic groups (13); the degree of substitution of hydroxyl groups on the residues of polyphosphoric acids reaches 0.3-0.6.