题目内容

Amorphous thermoplastics are formed above their ____

A. glass transition temperatures
B. softening points
C. melting temperatures
D. none of the above

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SBS is a ( ) copolymer.

Alternating
Block
C. Random
D. Graft

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Which of the following materials can experience a ductile-to-brittle transition with a lowering of temperature, an increase in strain rate, and/or an alteration of specimen thickness or geometry.( )

A. Thermoset
B. Thermoplastic
C. Linear
D. Branched

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For thermoplastic polymers, factors that favor brittle fracture are( ).

A. a reduction in temperature
B. an increase in strain rate
C. the presence of a sharp notch
D. increased specimen thickness
E. modifications of the polymer structure.

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The molecular characteristics that are essential for elastomers are( ).

A. they must be amorphous, having chains that are extensively coiled and kinked in the unstressed state
B. there must be some crosslinking
C. increased specimen thickness

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Amorphous thermoplastics are formed above their ____

A. glass transition temperatures B. softening points C. melting temperatures D. none of the above

SBS is a ( ) copolymer.

Which of the following materials can experience a ductile-to-brittle transition with a lowering of temperature, an increase in strain rate, and/or an alteration of specimen thickness or geometry.( )

For thermoplastic polymers, factors that favor brittle fracture are( ).

The molecular characteristics that are essential for elastomers are( ).

A. glass transition temperatures
B. softening points
C. melting temperatures
D. none of the above