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1、PolymerProcessingReferencesBillmeyer*Ch.17,18Elias**Ch.14*TextbookofPolymerScience2ndEd.Wiley-Interscience,NewYork(1962,1971)**AnIntroductiontoPolymerScienceVCH,NewYork(1997)LegacyLectureofFall2000ThislecturewascontributedbytheMS-IclassofFall2000.LefttoRightNhanThai,LeeMadsen,LuZiq
2、iang,ZuYichuan,NikhilGuptaSimonMwongela,AndreaDupre,MariahMcMasters,VeraVerdree,AngelaDavisNadiaEdwin,ThomasMorgan,AmyMorara,XiaomingLiangMissing:JustinMecomberNotjustonepolystyreneSelectedPSgradesfromBASF.VEF=veryeasyflow;HM=highmolarmass;HR=heatresistant.TakenfromElias,Ch.14.Proc
3、essingengineersselectgradesusingdatasuchasthese,perhapsrelyingonsuchnumbersmorethanthemoleculardatasuchasMorRgthatchemistsareusedto.Notehowcompletelyunmolecular!WhatmolecularpropertiesdoyousupposecorrespondtoEF,HRorHM?BacktotheBeginningEarlyinthecourse,wetriedseveralwaystocategoriz
4、epolymers,suchascondensationvs.addition,etc.Fromaprocessingpointofview,themainclassesare:Thermoplastic:theresinisheatedtomakeaviscousliquidandthenprocessedintoausableobjectwithoutmuchadditionalchemistry.Example:polyethylene,polystyrene.Thermoset:uponheating,furtherreactionoccurstom
5、akemolecules“setup”intoausefulproduct.Chemistryoccurs,sothesearesometimescalled“reactivepolymers”.Theresinmaybeprovidedaseithersmallmoleculesor“prepregs”—partiallypolymerizedstuff.Example:polyurethanes,phenol-formaldehyde,melamine-formaldehyde,epoxyglue.CompressionMoldingRedrawnbyN
6、ikhilGuptaandYichuanXufromBillmeyerFig.17-1PlatenMoldPlungerGuidePinsMoldCavityPlatenHydraulicPlungerHeatandCoolingHeatandCoolingHydraulicPressureCompoundtobemoldedInjectionMoldingHydraulicPressureNozzleRedrawnbyZiqiangLuandAndreaDuprefromBillmeyerFig.17-2Feedhopper,containspolymer
7、pelletsBlowMolding—e.g.milkbottleExtrudedParison-MoldOpenMoldClosedandBottleBlownFinishedBottleRemovedfromMoldPlasticRedrawnbyThomasMorganfromBillmeyerFig.17-3Four-rollcalenderWadofplasticToconditioningequipmentBasedonBillmeyerFig.17-4(referencesWinding1961)APlasticsExtruder—e.g.tu
8、bingFeedhopperHeatersCores
