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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,thebestchoiceofpolymerisNaturalRubb
2、er.B)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)str
3、ength,creepresistanceimpacttoughness,wearresistance,andmeltingtemperatureallincreasewithA)degreeofpolymerizationB)densityofbranchingC)tacticityD)crystallinity4)ABS,composedofacrylonitrile,butadiene,andstyrene(苯乙烯)，isoneofthemostcommonpolymermaterials.Styreneandacrylonitrileformalinerco
4、polymer(异量分子聚合物)(SNA)thatservesasamatrix.Styreneandbutadienealsoformalinercopolymer,BSrubber,whichactsasthematerial.A)fireretardantB)fillerC)cross-linkingD)plasticizer5)Epoxies(环氧树月旨)arethermosettingpolymersformedfrommoleculescontainingatightC-O-Cring.Duringpolymerization,theC-O-Crings
5、areopenedandthebondsarerearrangedtojointhemolecules.Ifepoxyisusedasanadhesive(粘齐ll)foravarietyofapplications,whichkindofadhesivesdoesitbelongto?A)ChemicallyReactiveAdhesivesB)EvaporationorDiffusionAdhesivesC)Hot-MeltAdhesivesD)Pressure-SensitiveAdhesives6)Whatareathemajoradvantagesasso
6、ciatedwithplasticcomparedtoceramics(陶瓷)，glasses,andmetallicmaterials?A)lightweightandcorrosion(铁锈,腐蚀ResistantB)highstrengthandhigh-temperatureresistantC)high-temperatureresistantandinsulatingD)highstiffnessandcorrosion-resistant7)Whichoneisnotathermosetpolymer?A)PolyethyleneB)NaturalRu
7、bberC)EpoxyD)Phenolic8)Dependingonthedegreeofcross-linking,thepolyurethanesbehaveasthermosettingpolymers,thermoplastics(热塑性塑胶)，orelastomers.Thesepolymersfindapplicationasfibers,coatings,andfoamsforfurniture,mattress,andinsulation.Whypolyurethanesareversatile?A)fortheirpolarrepeatunit
