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For each of the following pairs of polymers, do the

For each of the following pairs of polymers, do the

For each of the following pairs of polymers, do the following: (1) state whether or not it is possible to determine whether one polymer is more likely to crystallize than the other; (2) if it is possible, note which is the more likely and then cite reason(s) for your choice; and (3) if it is not possible to decide, then state why.
(a) Linear and syndiotactic poly(vinyl chloride); linear and isotactic polystyrene.
(b) Network phenol-formaldehyde; linear and heavily crosslinked cis-isoprene.
(c) Linear polyethylene; lightly branched isotactic polypropylene.
(d) Alternating poly(styrene-ethylene) copolymer; random poly(vinyl chloride-tetrafluoroethylene) copolymer.

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