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VARTM Process for Ramie Fiber Fabric Reinforced Anionic Polyamide-6 Composites  
VARTM Process for Ramie Fiber Fabric Reinforced Anionic Polyamide-6 Composites
資料類型: PDF文件
關鍵詞: vartm  anionic  polyae-6  ramie  fiber  fabric  thermoplastic  
composites  
資料大小: 109K
所屬學科: 分子表征
來源: 第六屆亞歐研討會上處理和性能增強聚合物會議文集(2013.6.2-6 武漢)
簡介:
Textilefiberreinforcedthermoplasticcompositesareincreasinglyusedformanufacturinghigh-performancelight-weightstructuresin,forinstance,theaerospaceandautomotiveindustry.Sincetheviscosityofthermoplasticpolymermeltsistoohigh,apoorimpregnationormoldfillwouldbehappened.Inordertomanufacturelarger,thickerandmoreintegratedthermoplasticcompositesthancurrentlycanbeachievedbymeltprocessing,avacuumassistedresintransfermolding(VARTM)iscurrentlybeingdevelopedusingareactivethermoplasticpolymercalledanionicpolyamide-6(APA-6).Naturalfiber,asakindoflowcost,lightweight,highspecificstrengthandstiffness,andnaturaldegradationofenvironment-friendlymaterial,usedinreinforcedcompositesiswidelyconcerned.However,nonaturalfiberreinforcedreactivethermoplasticpolymergradeshavebeenpreparedsofar.Throughourpreviousstudies,itwasdemonstratedthattherewasastronginteractionbetweenthelargenumberofhighlyreactivehydroxylonthesurfaceofcelluloseandtheinitiatorofAPA-6,whichresultinincompletepolymerizationwhenputtogether.Inordertosolvetheproblem,amethodwasadoptedbyusinganew-styleinitiatorcalledcaprolactammagnesiumbromide,whichhaslowerreactivityandweakeralkalineduetothefactthatitscationislargerandlessacidic,thuslimitedthereactionwiththehydroxylgroupsonthecellulose.itwouldmarkedlyreducetheconsumptionoftheinitiator.Asaresult,theroleofinhibitorhasbeensignificantlyimproved.FollowingramiefiberfabricreinforcedAPA-6compositeswithanaveragethicknessof2.5mmwaspreparedbyVARTM.Thesoxhletextractionanddifferentialscanningcalorimeter(DSC)measurementsrespectivelysuggestedthedegreeofconversionandcrystallizationofcompositeswas94%and50%.Remarkableimprovementofmechanicalpropertieswasachievedthroughdynamicmechanicalanalysis(DMA)andthree-pointbendingtest.Favorableinterfacialadhesionandwettabilitywererevealedbyscanningelectronmicroscopy(SEM)observation.Thevoidcontentandfiberfractionofcompositesweremeasuredbydensimeter.
作者: M. B. Yang, Z. Kan
上傳時間: 2013-06-26 15:37:56
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