题目内容

Which of the following would you expect to be thermosetting polymers at room temperature? ( )

A. Epoxy having a network structure
B. Lightly crosslinked poly(styrene-butadiene) random copolymer that has a glass-transition temperature of -50C
C. Lightly branched and semicrystalline polytetrafluoroethylene that has a glass-transition temperature of -100C
D. Heavily crosslinked poly(ethylene-propylene) random copolymer that has a glass-transition temperature of 0C
E. Thermoplastic elastomer that has a glass-transition temperature of 75C

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Which of the following polymer() would be suitable for the fabrication of cups to contain hot coffee? ( )

A. Polyethylene
B. Polystyrene
C. Poly(vinyl chloride)
D. PET polyester
E. Polycarbonate

Which of the following polymers belong to thermoplastic polymers? ( )

A. Polyethylene
B. Polystyrene
C. Poly(ethylene terephthalate)
D. Epoxies

On the basis of stress–strain behavior, polymers fall within three general classifications: ( )

A. Plastic
Brittle
C. Ductile
D. Highly elastic

The properties of polymers may be further modified by using additives; these include ( ).

A. Fillers
B. Plasticizers
C. Stabilizers
D. Colorants
E. Flame retardants