For each of the following pairs of polymers, do the following: (1) State whether 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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