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1、高分了物理部分Polymerphysics1.Comparethedefinitions,physicalmeaningsanddeterminationmethodsofthefollowingphysicalparameters・(15points)(1)meltingpointandequilibriummeltingpoint;(2)numberaveragemolecularweightandweightaveragemolecularweight;(3)crystallinityandorientationdegree
2、;(4)meansquareend-to-enddistanceandmeansquareradiusofgyration;(5)elasticmodulusandzeroshearviscosity;Two.Brieflydescribethemechanicalpropertiesofrubberelasticityandexplainthereasonsforitselasticity・(6points)Three,whatistheGausschain?What'sthedifferencebetweenaGausscha
3、inandafreelinkchain?(4points)Four.Howmanykindsofenergydissipationarethereinapolymersamplefromforcetofullfailure?Whichwayisthemostenergydissipation?(5points)Five・Drawthephasediagramoftwoyuanhighpolymeralloy,discussthephysicalmeaningofeachcurveinthephasediagram,andtheph
4、aseseparationmechanismofeachregion.Ifthecompatibilitybetweenthetwopolymersisverypoor,whatmethodscanbeusedtoincreasetheircompatibility,andaspecificpolymersystemexamplewillbeusedtoillustratethem.(5poinIs)Six.Mappingtheeffectsofmolecularweightofpolymersonthefollowingprop
5、erties:(10)A,modulustemperaturebehavior,B,me1tviscosity,C,glasstransitiontemperature,D,tensilestrength,eandcrystallizationspeed・Seven.AtatemperatureofTg=-17DEGCatatemperatureof25DEGC,ittakes8hourstorelaxthestresstoamodulusof2*105N/m2,andtotesthowlongitwilltaketorelaxa
6、tthe-20temperaturetothesamemodulus(5points)PolymerChemistrySectionFillintheblanks(20minutes)1,fromtheanalysisofpolymerizationthermodynamics,heatpolymerizationofethyleneisobutene(GaoHuodi),thereasonishotterthanethylenepolymerization;styrene(GaoHuodi),thereasonistwo;par
7、tialpolymerizationofvinylchlorideethylenepolymerizationheatheat(GaoHuodi),thereasonis.2,Thecharacteristicsoffreeradicalpolymerizationare,andtheanionicpolymerizationischaracterizedby,andcharacterizedby,cationicpolymerization,,,・3,inionicpolymerization,activeionsnearthe
8、re,theycanbe,andfourkindsofcombinationforms,andinbalance,thisbalanceismainlyaffectedbytheimpactofmobile・4andLewisacidareusua
