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As a consequence of their size and often complexity, polymer molecules are often only partially ______ (or semicrystalline), having crystalline regions dispersed within the remaining amorphous material.

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Polystyrene molecules, which have a phenyl group, are more resistant to rotational motion than are polyethylene chains by chain rotations.

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The long molecules of polymer are composed of structural entities called , which are successively repeated along the chain. The term monomer refers to the small molecule from which a is synthesized.

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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

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As a consequence of their size and often complexity, polymer molecules are often only partially ______ (or semicrystalline), having crystalline regions dispersed within the remaining amorphous material.

Polystyrene molecules, which have a phenyl ______ group, are more resistant to rotational motion than are polyethylene chains by chain ______ rotations.

The long molecules of polymer are composed of structural entities called ______ , which are successively repeated along the chain. The term monomer refers to the small molecule from which a ______ is synthesized.

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

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

Polystyrene molecules, which have a phenyl group, are more resistant to rotational motion than are polyethylene chains by chain rotations.

The long molecules of polymer are composed of structural entities called , which are successively repeated along the chain. The term monomer refers to the small molecule from which a is synthesized.