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Control of shish-kebab crystal alignment in polyethylene pipes by rotation extrusion  
Control of shish-kebab crystal alignment in polyethylene pipes by rotation extrusion
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所属学科: 高分子物理
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HDPEpipeshavebeenwidelyusedasgasorwatertransportpipes.Howtoenhancetheirstrengthandcrackresistanceremainsabigchallenge.ThispaperreportedanovelrotationextrusiontechniquetoprepareHDPEpipeswithhigherperformances.Thistechniquehasthefollowingfeatures:boththemandrelandthediecanrotate,eitherindependentlyorintegratedly;theinnerandouterwallscanbesimultaneouslycooleddown,andthecone-shapedsizingunitcanenlargethepipetomakefurtherhooporientationofPEmolecules.Therefore,thestressandtemperaturefieldcanbeeasilycontrolledduringtherotationextrusionsoastoadjustthecrystallizationandorientationofPE.ThetheoreticalanalysisonfourdifferentrotationmodesrevealedthattheHDPEmeltflowduringtherotationextrusiondeviatedfromtheaxialdirectionandformedacomplicatedhelicalflow,dependingontherotationmode,therotationspeedandtheradialposition.TheexperimentalresultsconfirmedthattheHDPEshish-kebabcrystalformeduponrotationdeviatedfromtheextrusiondirection,whichcouldbefurtherfixedbydoublecoolingonbothinnerandouterwallsofthepipe.Asaresult,theperformancesofthePEpipeweresignificantlyimproved,e.g.,thehooptensilestrengthandthecrackinitiationtimeoftheHDPEpipesmanufacturedbythenovelrotationextrusiontechniquecouldincreaseby78%and544%respectively,ascomparedtothoseoftheconventionallyextrudedpipes.
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