Give reasonable explanations for the following facts: (a) Free radical polymeriz

Question

Give reasonable explanations for the following facts:

(a) Free radical polymerization has receieved more widespread commercial development than ionic polymerization.

(b) Almost all substituted ethylene monomers of commercial importance have the structure Ch2=CHR or CH2=CRR'

(c) Syndiotactic placement is favored at low temperatures in free radical polymerization.

(d) In general, increasing polymerization rate decreases molecular weight in bulk polymerization, whereas the reverse is the case in emulsion polumerization.

(e) Propylene, isobutylene, and allyl acetate cannot be polymerized to hight molecular weight under usual free radical conditions.

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