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1、1.Material3.Property•polyethylene,polypropylene,polyamide,•glasstransitiontemperature,meltingpolyesterpoint,decomposition,degradation,•polystyrene,polycarbonate,polyvinylthermalstability,coefficientofchloride,polymethylmethacrylatethermalexpansion•synthesis,polymeriza
2、tion,catalyst,•impacttoughness,tensilestrength,chemicalreactivity,monomerreinforcement,meltindex•thermoplastic,thermoset,elastomer•modulus,stress-straincurve,elongationatbreak,deformation2.Structure•creep,stressrelaxation,annealing•doublebond,repeatunit,conformation,•
3、shear-thinning/thickeningpendantgroup,branchchain,coil•pseudoplastic,viscoelasticity•numberaveragemolecularweight•intermolecularattraction,hydrogen4.Processingbonding,entanglement,orientation•twin-screwextruders•amorphous,crystalline,crosslinked•injectionmolding•nucle
4、ation,foldedchainmodel,spherulite•die,mold,cavity•blend,composite,morphology,•processingaids/additives,fillercomposition,component,matrixphase•melt,plasticizing,solidify•Infraredspectroscopy•differentialscanningcalorimetry•X-raydiffraction•Becauseofthecloseconnectionb
5、etweenthetermsresins,plastics,andpolymers,theyaresometimesusedinterchangeably,althoughcorrectlyusedtherearedifferences.Tosummarize,polymersareanymaterialmadeupofmolecularchains;plasticsaresynthetic,long-chainpolymersthatcanbeorhavebeenshaped;andresinsaresolidsorliquid
6、sthataresubsequentlyshapedintoaplasticpart.•Thecomplexityinpolymersarisesbecausesolidpolymericmaterialscanexist,intwoverydistincttypesofstructure.Inonetype,thepolymermoleculesarerandomlycoiledabouteachotherwithentanglement.Thisstructuretypeiscalledamorphous.Inthesecon
7、dtype,thepolymermoleculescanpacktogetherintoregular,repeatingstructuralpatterns.Theseregularlypackedregionsarecalledcrystalsorcrystallineregions.•Themostimportant(butnottheonly)featureofapolymerthatdetermineswhetheritwillbeamorphousorcrystallineistheshapeofthepolymerr
8、epeatunit.Iftherepeatunitiscomplex,especiallywithlargependantgroups,thepolymercannotpacktightlytogetherandwillbeamorphous.So
