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1、材料科学与工程导论1Polymerization(聚合作用)istheprocessbywhichsmallmolecules(分子)consistingofoneunitorafewunitsarechemicallyjoinedtocreatethesegiantmolecules.ThosesmallmoleculeunitsarecalledA)polymersB)monomers(单体)C)oligomersD)elastomerscable.A)Forautomobilebumper,thebestchoiceofpolymerisNaturalRubber.B)
2、Formineralwaterbottle,thebestchoiceofpolymerisLow-Density(密度)Polyethylene(聚乙烯)C)Forinsulatingcable,thebestchoiceofpolymerispolystyrene(聚苯乙烯).D)Formineralwaterbottle^thebestchoiceofpolymerisPolyethyleneTerephthalate.3)Ingeneral,foragiventypeofthermoplastic(热塑性塑胶)thetensile(可延展的)strength,cree
3、presistanceimpacttoughness,wearresistance,andmeltingtemperatureallincreasewithA)degreeofpolymerizationB)densityofbranchingC)tacticityD)crystallinity4)ABS,composedofacrylonitrile,butadiene,andstyrene(苯乙烯)，isoneofthemostcommonpolymermaterials.Styreneandacrylonitrileformalinercopolymer(异量分子聚合物
4、)(SNA)thatservesasamatrix.Styreneandbutadienealsoformalinercopolymer,BSrubber,whichactsasthematerial.DorB?A)fireretardantB)fillerC)cross-linkingD)plasticizer5)Epoxies(环氧树月旨)arethermosettingpolymersformedfrommoleculescontainingatightC-O-Cring.Duringpolymerization,theC-O-Cringsareopenedandthe
5、bondsarerearrangedtojointhemolecules.Ifepoxyisusedasanadhesive(粘齐ll)foravarietyofapplications,whichkindofadhesivesdoesitbelongto?A)ChemicallyReactiveAdhesivesB)EvaporationorDiffusionAdhesivesC)Hot-MeltAdhesivesD)Pressure-SensitiveAdhesives6)Whatareathemajoradvantagesassociatedwithplasticcom
6、paredtoceramics(陶瓷)，glasses,andmetallicmaterials?A)lightweightandcorrosion(铁锈,腐蚀卜resistantB)highstrengthandhigh-temperatureresistantC)high-temperatureresistantandinsulatingD)highstiffnessandcorrosion-resistant7)Whichoneisnotathermosetpolymer?A)PolyethyleneB)NaturalRubberC)EpoxyD)Phenolic8)D
7、ependingonthedegreeofcross-linking,thepolyurethanesbehaveasthermosettingpolymers,thermoplastics(热塑性塑胶)，orelastomers.Thesepolymersfindapplicationasfibers,coatings,andfoamsforfurniture,mattress,andinsulation.Whypolyurethanesareversatile(为什么聚氨酯是通用的)？A)forth
