题目内容
In order to reduce our dependence on petroleum and the emissions of greenhouse gases, there has been a major effort to develop biodegradable polymers that are also ______ —based on plant-derived materials (biomass).
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How do the densities compare for crystalline and amorphous polymers of the same material that have identical molecular weights? ( )
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.( )
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