Preparation and characterization of novel Zn ions-containing flame-retardant ploy(ethylene terephthalate)

The flame-retardant polyester was synthesized from TPA,EG and 2-carboxy ethyl phenyl phosphinic acid glycol ester zinc salt( CEPPA-Zn). Polycondensation reaction time is shortened and condensation polymerization temperature is reduced due to the presence of flame retardant agent. The thermal behaviors of the flame-retardant polyester were investigated by differential scanning calorimetry( DSC) and thermogravimetric analysis( TGA),and it was found that flame retardant polyester' s glass transition temperature,crystallization temperature and melting point were increased. TGA test showed that the thermal stability was enhanced,and the quantity of carbon residue was increased due to the presence of Zn ions. Limiting oxygen index( LOI) test showed that LOI value of the flame retardant polyester was up to 36. 7% when the mass fraction of the Zn ions-containing flame retardant agent reached 7%.