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Question

For the following pair of polymers, do the following: (1) state whether it is possible to decide if one polymer has a higher tensile modulus than the other; (2) if this is possible, note which has the higher tensile modulus and then cite the reason(s) for your choice; and (3) if it is not possible to decide, state why not. $\bullet$ Syndiotactic polystyrene having a number-average molecular weight of 400,000 g/mol $\bullet$ Isotactic polystyrene having a number-average molecular weight of 650,000 g/mol

Solution

VerifiedStep 1

1 of 2Tensile modulus is independent of molecular weight. Additionally, both forms of polystyrene will crystallize. Therefore it is $\boxed{\text{Not possible}}$ to determine which has the higher tensile modulus.

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