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- Rank the following monomers in order of increasing reactivity toward anionic polymerization (least reactive to most reactive).When certain cycloalkenes are used in metathesis reactions, ringopening metathesis polymerization (ROMP) occurs to form a highmolecular- weight polymer, as shown with cyclopentene as the starting material. The reaction is driven to completion by relief of strain in the cycloalkene.What products are formed by ring-opening metathesis polymerization of each alkene?Propylene forms only oligomer under normal free radical conditions, yet the monomer forms high-molecular-weight polymer if it is polymerized while trapped in the channels of a crystalline host substance such as urea or thiourea. Explain [G. Di Silvestro, P. Sozzani, and M. Farina, Polym. Preprints, 27(1), 92, 1986].
- For indicated reaction provide: Ionic polymerization of propene. a. general equationb. Mechanismc. Discussion of regioselectivityd. Discussion of the proportion between the products formed (if more than one is formed).e. Discussion of stereoselectivity.(a) Which monomer is most likely to undergo anionic polymerization? Justify your choice. ( b)Which one ismost likely to undergo cationic polymerization? Justify your choice.Order the following monomers with respect to their expected reactivity toward cationic polymerization, and explain your answer:
- Order the following monomers with respect to their expected reactivity toward anionic polymerization, and explain your answer:A3 Anionic polymerization of styrene is generally known to produce polymers with a narrow molecular weight distribution. Explain the reason for this.Although chain branching in radical polymerizations can occur by intermolecular H abstraction as shown in Mechanism 30.2, chain branching can also occur by intramolecular H abstraction to form branched polyethylene that contains butyl groups as branches.a. Draw a stepwise mechanism that illustrates which H must be intramolecularly abstracted to form butyl substituents.b. Suggest a reason why the abstraction of this H is more facile than the abstraction of other H’s.
- Although chain branching in radical polymerizations can occur by intermolecular H abstraction as shown in Mechanism 28.2, chain branching can also occur by intramolecular H abstraction to form branched polyethylene that contains butyl groups as branches.a. Draw a stepwise mechanism that illustrates which H must be intramolecularly abstracted to form butyl substituents. b. Suggest a reason why the abstraction of this H is more facile than the abstraction of other H's.Consider monomers A–C. (a) Rank the monomers in order of increasingreactivity in cationic polymerization. (b) Rank the monomers in order ofincreasing reactivity in anionic polymerization.List the following group of monomers in order of decreasing ability to undergo cationic polymerization.