A novel hyperbranched polyphosphoramide (HBPPA) charring agent,containing P and N elements as well as triazine and benzene rings,was successfully prepared by one-pot method (A2+B3) from melamine (MEL) and phenyl dichlorophosphate (PDCP).XPS and 1H-NMR were used to analyze the chemical structure of HBPPA.With the addition of 25wt%(APP∶HBPPA=3∶1) of intumescent flame retardant,PP composite passed V0 rating at UL-94 test and its limiting oxygen index was increased to 30.6%.
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基金资助
国家自然科学基金青年科学基金(21306124);山西省自然科学基金(2015011035)
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