Prepatation, Structure And Application Reasarch Of Functional Phosphazene Polymer

Polyphosphazenes is a class of polymers,it characterized by alternating phosphorus and nitrogen atoms in backbone with alternating double and single bonds.Phosphorus atoms can be attached with various function substituent groups to generate different combinations of properties,therefore polyphosphazenes was widly used.The synthesis of dichloro-phosphazene polymer was studied, MEEP was synthesized, and its structure was characterized, remixed LiCF3SO3 with MEEP can synthesize lithium ion battery electrolytes,the ratios of MEEP to LiCF3SO3 and the conductivity at different temperatrue were investigated, the results suggestted that 8 of the ratio of oxygen atoms in MEEP to Li+,the congductivity can reach maximum.Three of cyclotriphosphazene derivativers was synthesized to use as halogen-free flame retardant adding into EMC, properties of EMC was tested,compared with traditional flame retardant(brominated epoxy resin),the results showed that the flame retardancy of EMC was highly increased when use phosphazene halogen-free flame retardant, it can also promote the solidification of epoxy resin and no influence on other properties of EMC.PPP was synthesized, and the sructrue was also characterized, then TG-IR, Pyrolysis-GC-MS were used to analysis the thermal decomoposition behavior and thermal properties of PPP. Mixing the poly phenoxy phosphazene with boron phenolic resin to synthesize composite material which was used in the field of ablation resistance, the combustion performance was tesed by cone calorimeter and oxyacetylene ablation testing machine. Compared with boron phenolic resin, adding polyphenoxyphosphazene can play the role of better thermal insulation by forming honeycomb residual carbon layer. It was found that the introduction of PPP can decrease thermal stress and internal friction,accompanied with better using performance by dynamic mechanical spectrometer.Polyphenoxyphosphazene was used to prepare microspheres and fiber by electrostatic spraying, the microspheres and fiber can be applied in drug release, the influence of parameters on morphology of microspheres and fiber was investigated.