题目内容
The number-average molecular weight of a polypropylene is 1,000,000 g/mol. the degree of polymerization is ______ .
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The most viable recyclable alternatives to traditional rubber materials are thermoplastic elastomers. Being thermoplastic in nature, they are not chemically ______ and, thus, are easily reshaped. Furthermore, production energy requirements are lower than for theFurthermore, production energy requirements are lower than for the thermoset rubbers because a vulcanization step is not required in their manufacture.
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).
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 ____
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