Synthesis And Characteristic Of P-containing Flame Retardant Polymer

A novel phosphorus-containing polymer retardant, PDPPP, was synthesized from phenylphosphonyl dichloride (PPD) and 2-(6-oxido-6H-dibenz <1, 2 > oxaphosphorin -6-yl) 1, 4-benzenediol (ODOPB). PDPPP was characterized by FT-IR, Mass Spectroscopy and Nuclear Magnetic Resonance Spectroscopy. The results showed that the flame-retardant element, phosphorus, was bonded both in the main chains and in the pendant chains of polymer molecules. Moreover, the ignition time was postponed and the char residues of PET were increased, showing that the high phosphorus content and rich aryl group structures of PDPPP contributed excellent flame retardancy to polyethylene terephthalate (PET). PDPPP was also very effective in improving flame retardancy of epoxy resin, polyamide-6 and unsaturated polyester, while had no flame, retardancy for ABS and PE. The thermal behaviors of PET/PDPPP blends were also investigated using TGA and DSC. The results showed that the speed of crystatillization of PET increased after adding PDPPP. Furthermore, SEM analysis and the tensile test proved that PDPPP was well distributed in PET and didn't cause considerable decrease of mechanical properties of PET.