Phosphorus-containing aromatic poly

Agrawal S, Narula AK. Synthesis and characterization of phosphorus containing aromatic poly(amide-imide)s copolymers for high temperature applications. Polym Bull 2013 70(12) 3241-60. 

A powerful and efficient method for the preparation of poly(ketone)s is the direct polycondensation of dicarboxylic acids with aromatic compounds or of aromatic carboxylic acids using phosphorus pentoxide/methanesulfonic acid (PPMA)16 or polyphosphoric acid (PPA)17 as the condensing agent and solvent. By applying both of these reagents to the synthesis of hexafluoroisopropylidene-unit-containing aromatic poly(ketone)s, various types of poly(ketone)s such as poly(ether ketone) (11), poly(ketone) (12), poly(sulfide ketone) (13), and poly-... 

Phosphorus containing poly(maleimide-amines) were synthesized from N,N -bisdichloromaleimido-3,3 -diphenyl alkylphosphine oxides and aromatic diamines or piperazine [144]. The polymers prepared from piperazine are soluble in DMF, DM AC, DMSO, etc., but have poor thermal stability and flame retardancy. 

Polymers with an aromatic group in the main chain, however, such as polysulphones, polycarbonates and poly(phenylene oxides) proved to be intermediate in their smoke generation, possibly due to their considerable charring tendency. Also the unexpected drop in smoke density observed when poly(vinyl chloride) is partially chlorinated may be attributed to the high char yield. Einhom et al. (1968) concluded that smoke development decreases with increasing amount of chlorine- and phosphorus-containing additives, and with increasing cross-link density. 

Beside inhibiting thermooxidative ageing, phosphorus containing additives increase radiation resistance of polyimides and poly(alkyl terephthalates) the rate of evolution of the aromatic ring radiation degradation product - CH4 reduces two-fold. 

Using this method, a number of poly-isophthalamides with trifunctional monomers [18] or poly-trimethyl and fert-butylhydroquinone aromatic polyamides can be prepared [19]. Another interesting example of the use of Yamasaki s reaction is the preparation of organosolu-ble aromatic polyamides containing phosphorus [20] or the preparation of polyamides with a diamantane moiety embedded in the structure of the principal chain [21]. 

Serbezeanu Diana, Vlad-Bubulac Tachita, and Hamciuc Corneliu. Synthesis and characterization of new aromatic-aliphatic poly(ester-imide)s containing phosphorus. Rev. Roum. Chim. 55 no. 10 (2010a) 667-672. 

In the preparation of the linear analogues, solvents such as nitrobenzene [478] and methylene chloride [479] were used. A new method capable of creating poly(ether ketone) and polyfthioether ketone) was recently disclosed by Ueda et al. [480-482]. Here, the dehydrating power of a mixture of phosphorus pentoxide and methanesulfonic acid (MSA) is the driving force for the direct polycondensation of aromatic dicarboxylic acids with aryl compounds contain-... 

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