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 strength than the other; (2) if this is possible, note which has the higher tensile strength and cite the reason(s) for your choice; and (3) if it is not possible to decide, state why.
(a) Linear and isotactic poly(vinyl chloride) with a weight-average molecular weight of 100,000 g/mol; branched and atactic poly(vinyl chloride) having a weight-average molecular weight of 75,000 g/mol
(b) Graft acrylonitrile–butadiene copolymer with 10% of possible sites crosslinked; alternating acrylonitrile–butadiene copolymer with 5% of possible sites crosslinked
(c) Network polyester; lightly branched polytetrafluoroethylene
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