干湿纺聚丙烯腈碳纤维原丝的成形机理分析

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1、查兰查兰竺主兰竺堕塞——————±塑望墨亘堕堕堡!!生堕兰塑壁墅坐些塑茎bimodallineswereahnostparalleltothePAN4DMSOaxis；ariel‘associatedbyBoomfunction，itwasfoundedthattheobtainedlinewouldhaveaturnatsomePANvolumefractionandtheslopeandinterceptweredifferentindifferentsystems，whichwereallrelatedwiththeinteractionparameters；

2、threemethodsaboutchangingtheinitialcomponentofspinningsolutionwereobtainedbythequalitativeanalysisSOthatthecoagulationbehaviorwouldbeenadjusted．Themasstransferdynamicsofdiffusionisveryimportantandsomestudiesweretriedtosetupthecomponentconcentrationfunctions．Thepolymersolutionstreamwasd

3、ividedasseveralgrowthringsandtheconcentrationdistributionalongthefiberradiuswasevolvedfromthefirstrickdiffusionlaw．Anothermethodwastriedtosolvethesecondrickdiffusionlaw．Thediffusioncoefficientswerecalculatedbydifferenttheoreticalfunctions．Thediffusioncoefficientsweredifferentfromthecal

4、culateddata，becausePANcouldhindersolventandnon—solventindiffusionandthedatawereapparent．TheanalysisoftheexperimentalresultsfromKojiTeradashowedthattheapparentdiffusioncoefficientswereinfluencedbythetemperature，spinneretradiusandcoagulantconcentration．Theradiusvariationoffibercouldhavet

5、woeffects．whichwerethevariationsofthediffusionsurfaceandthediffusiongradient．ThecomponentconcentrationalongtheradiusoffiberspunfromPAN／DMSOsolutionwasobtainedwiththeuseofcalculateddiffusioncoe箍cients．Andtheresultscalculatedfromthetwodifferentmasstransferfunctionsweresimilarwitheachothe

6、r．Thesolventconcentrationwasoftadialgradientandthesolventonthesurfaceoffiberreachedtheequilibriumstateinstantaneously．Thegeldynamicsexperimentsshowedthatthe2e1formationlawwassimilarwiththeotherpolymersystems，whichwasVII东华犬学硕士学位论文一一!望堑鐾亘堕堕壁竺丝堡竺塑坚墅塑堡竺蒌一relatedwithdensesurfaceunderthesoft

7、coagulatingconditionandthethickeninggel；thesquareofgelthicknesswaslinearwithcoagulationlime．Thequalitativeanalysisofthesurfacepuckersoffibersspunfromwetspinninganddry-jetwetspinningwasmade．Thepositionswherethedieswellappearedwerenotthesameandthedieswellappearedattheairgapwherethefibe