Synthesis And Application Of Phosphorous-nitrogen Containing Heat-resistants

With the extensive application of polymer materials,the potential danger of fire is increasing,so the research and application of new polymer materials with flame retardancy and high heat resistance have been paid more and more attention by domestic and foreign materials scientists.Nitrogen and phosphorus synergistic flame retardant both nitrogen and phosphorus flame retardant efficient,low smoke,low toxicity,green environmental advantages,but the addition of flame retardant polymer materials will inevitably lead to loss of mechanical properties of materials,will Nitrogen and phosphorus elements into the carbon nanotubes,the flame retardant at the same time both nitrogen and phosphorus flame retardant and carbon nanotube flame retardant characteristics,and with carbon nanotubes can guarantee the mechanical properties of the advantages of the material.Therefore,carbon nanotubes modified by nitrogen and phosphorus elements are usually able to improve in terms of thermal stability,strength,modulus and other properties.In this paper,the nitrogen-containing monomer 6-(4-hydroxyphenyl)-3(2H)-ketone(HPZ)was prepared and the nitrogen-containing bisphenol monomer.The structure and molecular weight of the nitrogen-containing polyphosphate were confirmed by FTIR,1H NMR and MS.The intrinsic viscosity was 0.2451 d L·g-1,and the structure and molecular weight of the nitrogen-containing polyphosphate were confirmed by FTIR,1H NMR and MS,molecular weight of 547 and 717,and the thermal stability and flame retardancy of EP in EP were tested by TG and limit oxygen index tester.The flame retardancy mechanism in EP was determined.The reaction of hydroxylated carbon nanotubes with phosphorus oxychloride,and then with nitrogen-containing bisphenol monomer(HPZ),the introduction of nitrogen and phosphorus into the surface of carbon nanotubes,through FTIR,TEM,TG on its structure.It was confirmed that OMWCNT and PBAT were melt blended in a torque rheometer,and their structures,thermal stability and mechanical properties were tested by SEM,DSC,TG,universal tensile tester and DMA.It is proved that the nitrogen-containing polyphosphate prepared with HPZ monomer is a low molecular weight polymer with-OH or-NH active group by FTIR,NMR and mass spectrometry.It is proved that the nitrogen-containing polyphosphate modified epoxy resin,The addition of nitrogen-containing polyphosphate was 25%,and cured at 100 oC for 10 h,a better flame-retardant curing effect could be obtained,and it was confirmed by infrared spectroscopy and TGA to track its curing process in EP.The active-OH or-NH can open the epoxy of the epoxy resin,play the role of curing agent,so that epoxy resin curing.Therefore,the prepared nitrogen-containing polyphosphate can exhibit NP synergistic flame retardant and promote the curing of EP as a curing agent.The nitrogen-phosphorus-containing carbon nanotubes and the thermogravimetric analysis under air atmosphere show that MWCNT-OH is in 800 oC.The residual amount was 0,while the modified OMWCNT had 8.9% residual at 800 oC,and the modified carbon nanotubes exhibited excellent thermal stability,and the introduced nitrogen and phosphorus elements exhibited NP synergistic effect.Because the carbon nanotubes themselves as rigid particles and nano-materials unique characteristics of the polymer can enhance the role of toughening,can make up the addition of flame retardants to bring the mechanical properties of the decline.PBAT/OMWCNT nanocomposites were prepared by mixing PBAT and OMWCNT containing nitrogen and phosphorus elements by torque rheometer.The morphology of nanocomposites with different OMWCNT contents was observed by scanning electron microscopy(SEM).The OMWCNT content was the results show that the PBAT/OMWCNT nanocomposites have good thermal stability when the addition amount of OMWCNT is 5%,and the results are analyzed by the universal tensile test.The results show that the fracture toughness of the nanocomposites is the largest,indicating that the toughness of the materials is good,and because PBAT belongs to the whole biodegradable material,it is necessary to solve the problem of white pollution and protect the environment.Has a better application prospects.