| abstract |
The invention mainly provides a preparation method of high flame-retardant modified polyacrylonitrile, which comprises pre-polymerizing an A composition and a B composition respectively to obtain first and second prepolymer solutions, and then the first and second The prepolymer solution is blended or copolymerized in a predetermined ratio to obtain a highly flame-retardant modified polyacrylonitrile having a molecular weight of not more than 80,000. Further, the present invention provides a flame retardant fiber containing the highly flame-retardant modified polyacrylonitrile. |