PreparationandflameretardanceofPANfabricmodifiedbyPA/PEIlayer-by-layerself-assemblyZHAOYunxia，XUJing，CHENYe，KEFuyou(StateKeyLaboratoryofFiberMaterialModification，SchoolofMaterialsScienceandEngineering，DonghuaUniversity，Shanghai201620)Abstract:Polyacrylonitrile(PAN)fabricswerepretreatedwithphyticacid(PA)topreparepretreatedPANfabrics(PAN-PA)．ThenPAandpolyethyleneimide(PEI)werealternatelyadsorbedandself-assembledonthesurfaceofPAN-PAfabrics，thusa10-layerself-assembledflameretardantfabric(PAN-10BL)wasobtained．Thestructure，surfacemorphologyandelementcontentoftheflame-retardantfabricswerestudied．Thethermalpropertiesandflameretardanceofthefabricswerestudied．TheresultsshowedthatcarboxylicacidandphosphategroupsweresuccessfullyintroducedonthesurfaceofPANfabricafterPApre-treatment，andthemassfractionofphosphoruselementreached8．61%;andthesurfaceofPANfabrichadnoobviousfiberboundary，thecontentofnitrogenhydrogenbondincreased，thetemperaturecorrespondingtothemaximumheatreleaseratereached769℃duringcombustion，themassfractionofresidualcarbonwas5%at900℃，thelimitingoxygenindexincreasedfrom17．4%to21．8%，andthethermalstabilityandflameretardanceofthefabricwereimprovedafterlayer-by-layerself-assem-blyof10layersofPAandPEI．Keywords:polyacrylonitrilefiber;phyticacid;layer-by-layerselfassembly;flameretardantmodification国内外动态万泰化学PAN基高端碳纤维项目开工2023年2月28日，内蒙古万泰化学纤维集团有限公司200kt/a聚丙烯腈(PAN)基原丝和100kt/aPAN基高端碳纤维项目正式开工建设，标志着万泰化学PAN基高端碳纤维项目正式开工。该项目总投资111亿元，分二期建设，其中一期投资14亿元，建设16kt/a碳化全流程生产线、32kt/a原丝生产线、自备发电站变电站及仓储设施、污水处理站等，建设周期为2023—2025年;二期投资97亿元，建设84kt/a碳化全流程生产线、168kt/a碳纤维原丝生产线、自备发电站变电站、公用工程等，建设周期为2025—2027年。(通讯员钱伯章)2022年我国聚酰胺6切片的进口概况据海关统计，2022年我国聚酰胺6(PA6)切片的进口...
