植酸铜/聚丙烯腈改性膜的制备及阻燃性能

针对聚丙烯腈高易燃性且产生大量有毒气体的缺点,利用植酸铜阻燃改性聚丙烯腈.首先选取植酸与乙酸铜制备植酸铜螯合物,并利用共混法制备植酸铜/聚丙烯腈改性膜;采用燃烧测试、X射线荧光光谱仪、傅里叶红外光谱和热重分析等方法分别对改性膜的阻燃性能、元素组成、结构和热稳定性能进行研究,探讨植酸铜在聚丙烯腈膜燃烧时的阻燃机理.结果表...

Preparation of copper phytate/polyacrylonitrile modified membrane and its flame retardant property

Aiming at the disadvantages that polyacrylonitrile is highly flammable and usually generates a large amount of black smoke during combustion,copper phytate was used to improve flame retardant property of polyacrylonitrile.Copper phytate complex was synthesized by the reaction of phytic acid and copper acetate.Then,the copper phytate/polyacrylonitrile modified membranes were prepared via blending method.Finally,the flame resistance,elemental composition,structure,and thermal stability of modified membranes were tested by Combustion test,energy dispersive X-ray(EDXR)spectroscopy,Fourier transform infrared(FTIR)spectroscopy,and thermogravimetric(TG)analysis,respectively.The flame retardant mechanism was also proposed.The results indicated that when the weight amount of copper phytate was 40%,the modified membranes didn′t produce black smoke,and can achieve self-extinguishing during combustion.After combustion,the modified membranes produced a large amount of residual char.EDXR and FTIR analysis proved that flame retardant elements of phosphorus and copper were successfully introduced into the modified membranes,and copper phytate were successfully blended with polyacrylonitrile.TG analysis showed that copper phytate can effectively improve the thermal stability and char forming characteristics of polyacrylonitrile,the carbon residual rate of the copper phytate modified polyacrylonitrile membrane was 17.4%higher than that of the untreated polyacrylonitrile membrane.Meanwhile,the thermal degradation rate of modified polyacrylonitrile membrane decreased by 5.3%/min compared with that of untreated polyacrylonitrile membrane.The flame retardant mechanism belonged to a condensed phase flame retardant mechanism,which imparted flame retardancy to polyacrylonitrile by preventing heat source diffusion and the entry of flammable gases.