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Daily Quiz
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In a thermoplastic elastomer (TPE) that is a blend of a rubbery phase and a glassy plastic phase, what is the role of the glassy plastic phase at room temperature?
It acts as a plasticizer, lowering the T g of the rubbery phase.
It provides the elastic properties of the material.
It forms physical crosslinks, preventing flow at room temperature and contributing to strength.
How does polydispersity index (PDI) relate to the distribution of molecular weights in a polymer sample?
A high PDI indicates a narrow distribution of molecular weights
PDI is not related to the distribution of molecular weights
A low PDI indicates a narrow distribution of molecular weights
What does the term "Weight Average Molecular Weight (Mw)" represent in polymers?
The sum of the molecular weights of all polymer chains divided by the total number of chains
The molecular weight of the polymer chain with the most occurrences
The average molecular weight of the polymer chains weighted by their relative abundance
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