mework 3A) What is the initiator in the polymerization of isobutylene? 3B) Is Le

Question

mework 3A) What is the initiator in the polymerization of isobutylene? 3B) Is Lewis acid (a) an electrophile or (b) a mucleophile? 3C) Is Lewis base (a) an electrophile or (b) a nucleophile? 3D) Why isn't cationic) of pure monomer? 3E) Is the usual confi tail or (b) head to head? 3F) cationic or (b) anionic and why? hy isn't coupling a preferned termination step in ionic polymerization (anionic and s the usual configuration of polymers produced by ionic chain polymerization (a) bead to Which technique would you choose for producing a polymer of isobutyl vinyl ether: (a) 3G) Which technique would you choose for prodacing a polymer of acrylonitrile: (a) cationic or (b) anionic and why? 3H) Which of the following could be used to initiate the polymerization of isobutylene: (a) sulfuric acid, (b) boron trifluoride etherate, (c) water, or (d) butyllithium? 31) Which of the following could be polymerized by cationic chain polymerization?

Explanation / Answer

3A) We may use free radical intiator (benzoyl peroxide), if you are not talking about some specific experiment

B) Lewis acid seeks electrons so it is an electrophile

C) Lewis base can give electrons so it is a nucleophile

D) The termination is done by use of terminators or inhibitors as they help in inactivation of growing chain alogwith termination of the kinetic chain.

E) Its head to tail

F) During propagtion step the alkoxide ion formed from the monomeric ether is stabilized by lewis acid so cationic polymerisation is preferred over anionic polymerisation

G) We will use anionic polymerisation.

As in case of acrylonitrile during polymerisation, the species formed by during propagation is negatively charged.

The presence of electronwithdrawing group will be favoured by anionic polymerisation

H) BoronTriflouride etherate

I) b and e

J) sodium metal

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