高分子材料题目

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1、CHAPTER1Polymermaterial<1>Theuniquematerialpropertiesof_polymer_andtheversatilityoftheir_processing_methodsareattributedtotheirmolecularstructure.<2>Traditionally,theindustryhasproducedtwomaintypesofsyntheticpolymer－_plastics___and_rubbers___.<3>塑料主要被分为__热塑性塑料___和__热固性塑

2、料____两种类型，橡胶主要被分为__天然橡胶___和__人工合成橡胶____两种类型。<4>Thermosetscanbedefinedasthosepolymerswhichbecome___B__hardonheatingorbyadditionofspecialchemicals.AreversiblyBirreversibly<5>__B__shareafeaturewithconventionalvulcanizedrubbers.AThermoplasticsBThermosets判断题<6>由于当今人们已普遍使用塑料，所以塑料

3、是很便宜的。（F）<7>天然橡胶是最主要橡胶材料。（F）<8>Whatarethereasonsforthecontinuedgrowthintheuseofpolymers?Answer:electricalinsulationsincenon-conducting;toughnesstoresistmechanicalabusesuchasimpact;lowweight;easeofmanufacture.<9>Whatisthecrucialreasonformoreandmorepopularuseofpolymers?Answer

4、:Itistheincreaseinmechanicalintegrity,sincethefatigueresistanceofcompositestructuresismuchgreaterthanmetalalloybecausecracksaredifficulttoinitiateandpropagateowingtothemultiplicityofinterfaceswithinthematerial.<10>Howcananexperiencedplasticsengineersoftenidentifyapolymer?An

5、swer:Theycanoftenidentifyapolymerbytoughing,smelling,andtappingit.CHAPTER1Extrution一填空题1>Duringextrusion,apolymermeltispumpedthroughashapingdieandformedintoaprofile.2>Theplasticatingextrudercanbedividedintothreemainzone:thesolidsconveyingzone:the_meltingzone；the_metering_zo

6、ne.3>Youcanthinkofnotlessthanthreeextrusiondies:__sheetingdies__,__tubulardies__,__strandingdies___,二选择题1>Toavoidexcessivepressuresthatcanleadtobarrelorsawfailure,thelengthofthegroovedsectionmustnotexceed__A_.A.3.5DB.4.5DC.5.5DD.6.5D2>传统式单螺杆挤出机依靠____A___为拉力产生足够压力。A.定型段B.输送段

7、C.压缩段3>下列正确的是（AD）A．n=1为牛顿流体B。n=1为塑性流体Cn>1为假塑性流体Dn<1为假塑性流体三．判断题1>要压实来自进料口的固体颗粒并运送它，必须使螺杆表面的摩擦力超过筒表面的摩擦力。（F）2>双螺杆式的挤出机通常用于高分子材料的混合。（T）四．问答题1>Whatarethetasksofaplasticatingextruder?Answer:Transportthesolidpelletsorpowerfromthehoppertothescrewchannel;Compactthepelletsandmovethe

8、mdownthechannel;Meltthepellets;Mixthepolymerintoahomogeneousmelt;Pumpthemeltthroug