Flame retardant polyphosphate esters: 1. Condensation polymers of bisphenols with aryl phosphorodichloridates: synthesis, characterization and thermal studies

Polyphosphate esters were synthesized by the solution polycondensation of bisphenols with aryl phosphorodichloridates. The polymers were characterized by i.r. and 1H, 13C and 31P n.m.r. spectroscopy. The molecular weights were determined by end group analysis using 1H and 31P n.m.r. spectral data. The thermal stability of the polymers was analysed by thermogravimetry

Novel polymeric flame retardant plasticizers for poly(vinyl chloride)

Polyphosphate esters have been used as polymeric flame retardant plasticizers in poly(vinyl chloride); thermal and flammability studies were carried out to evaluate their efficiencies as fire retardants. A comparison is also made on the fire retardancy of the conventional simple phosphates with that of the polyphosphates as novel fire retardant plasticizers for PVC

Synthesis and properties of flame retardant polyphosphate esters - a review

A review with 109 refs. discussed the synthesis, flame-retardant and plasticizing properties, and potential uses of phosphoric acid polyesters. They were prepd. by polycondensation of diols or dihydric phenols with alkyl or aryl phosphorodichloridates in soln., in the melt, or at an interface. Their thermal stability and flame-retardant ability depended on the polymer structure. Small amts. of the phosphoric acid polyesters compared to halogen-based flame retardants were sufficient to make polymers flame retardant

Flame retardant polyphosphate esters: 2. Condensation polymers of bisphenol A with alkyl phosphorodichloridates: synthesis, characterization and thermal studies

Polyphosphate esters based on bisphenol A and alkyl phosphorodichloridates have been synthesized and characterized by i.r. and n.m.r. spectroscopy. The molecular weights were calculated from 31P n.m.r. The thermal stability of the polymers were analysed by thermogravimetry

Is Gasification Rate Controlling Step in Polymer Ignition?

A kinetic study of the polymer ignition processes has been carried out from the ignition delay measurements at different temperatures. The process was found to have a low activation energy, and from a comparison with the results of the kinetic study of the polymer gasification, it is argued that the rate controlling step could be the gasification of the degradation products. A pyrolysis gas chromatographic study of several polymers support the above conclusion