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3. For each of the following pairs of polymers, do the following: (1) state whether it is possible to decide whether one polymer has a
3. For each of the following pairs of polymers, do the following: (1) state whether it is possible to decide whether 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, then state why. (a) Branched and atactic poly(vinyl chloride) with a weight average molecular weight of 100,000g/mol; linear and isotactic poly(vinyl chloride) having a weight average molecular weight of 75,000g/mol (b) Random styrene-butadiene copolymer with 5% of possible sites crosslinked; block styrene-butadiene copolymer with 10% of possible sites crosslinked. (c) Branched polyethylene with a number-average molecular weight of 100,000 g/mol; atactic polypropylene with a number-average molecular weight of 150,000 g/mol
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