Describe the relative tendencies of the following polymers to crystallize.
Explain your answer.
(a) Branched polyethylene versus linear polyethylene;
(b) Polyethylene versus polyethylene-polypropylene copolymer;
(c) Isotactic polypropylene versus atactic polypropylene; and
(d) Polymethyl methacrylate versus acetal (polyoxymethylene).
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