Nanocomposites Of Flame Retardant Copolyesters Containing Phosphorus Linked Pendent Groups/Inorganic Particles

Poly(ethylene terephthalate) (PET) is one type of fiber materials which is widest used in the textile field due to its high modulus, intensity, elasticity, conformal ability and thermal stability. Since the 1990s, China has been the country of the biggest output of PET, and a great deal of attention has been paid to the research of the flame-retardant modification of PET. The polymer/inorganic particle nanocomposites have opened a new path to the flame retardance of polymers and was intituled the revolution of the flame-retardant technology of plastics. It is well known that the melt-dripping phenomenon is serious in the course of burning of phosphorus-containing polyesters. The development of the preparation technology of inorganic nano-particles and its application in polymers provided a way to addressing the problem.The flame retardant copolyesters containing phosphorus linked pendent groups (PFRP), derived from 9,10-dihydro-10 [2,3-di (hydroxycarbonyl) propyl] 10-phosphaphenanthrene-10-oxide (DDP), terephthalic acid (TPA) and ethylene glycol(EG), were synthesized by melting polycondensation. Meanwhile, the flame retardant copolyester/BaSO₄ nanocomposite (NPFRP) was prepared by in-situ polycondensation. The thermal behavior, inflammability, crystallinity, rheological behavior and flame-retardant mechanism of the two materials were investigated...