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How do the densities compare for crystalline and amorphous polymers of the same material that have identical molecular weights? ( )

A. Density of crystalline polymer
B. Density of crystalline polymer  density of amorphous polymer
C. Density of crystalline polymer > density of amorphous polymer

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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

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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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How do the densities compare for crystalline and amorphous polymers of the same material that have identical molecular weights? ( )

A. Density of crystalline polymer B. Density of crystalline polymer  density of amorphous polymer C. Density of crystalline polymer > density of amorphous polymer

Amorphous thermoplastics are formed above their ____

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( ).

A. Density of crystalline polymer
B. Density of crystalline polymer  density of amorphous polymer
C. Density of crystalline polymer > density of amorphous polymer