材料科学与工程导论复习题（附答案）.doc

材料科学与工程导论 1P olymerization ( 聚合作用) is the process by which small molecules ( 分子) consisting ofone unit ora few units are chemically joined to create these giant molecules. T hose small molecule units are called______ A) polymers B) monomers (单体) C) oligomers D)elastomers 2 Choose the type of polymer material you might select for the following applications: an automobile bumper ( 保险杠),a mineral water bottle, and an insulating ( 绝热的) cable. A) For automobile bumper, the best choice of polymer is Natural Rubber. B) For mineral water bottle, the best choice of polymer is Low-Density (密度) Polyethylene (聚乙烯) C) For insulating cable, the best choice of polymer is polystyrene (聚苯乙烯). D) For mineral water bottle, the best choice of polymer is Polyethylene Terephthalate. 3) In general, for a given type of thermoplastic ( 热塑性塑胶) the tensile ( 可延展的) strength , creep resistance impact toughness, wear resistance, and melting temperature all increase with______ A) degree of polymerization B)density of branching C)tacticity D) crystallinity 4) ABS, composed of acrylonitrile, butadiene, and styrene ( 苯乙烯), isone of the mon polymer material s. Styrene and acrylonitrile form a liner copolymer ( 异量分子聚合物) (SNA) that serves asa matrix. Styrene and butadiene also form a liner copolymer, BS rubber, which acts as the ______ material. A) fire retardant B) filler C) cross-linking D)plasticizer 5) Epoxies