Concept explainers
(a)
Interpretation:
The
Concept Introduction:
Anionic polymerization: Initiator will be a nucleophile which reacts with the monomer to form a propagating site that is an anion and the initiator can be compounds like sodium amide or butyllithium.
Nucleophile will attack on the
(b)
Interpretation:
The polymerization of
Concept Introduction:
Cationic polymerization: The polymerization in which an electrophile acts as an initiator and adds to the monomer which leads to the formation of a carbocation.
The initiator widely used is a Lewis acid and in the polymerization the electrophile adds to the
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Essential Organic Chemistry (3rd Edition)
- Radical polymerization of styrene gives a linear polymer. Radical polymerization of a mixture of styrene and 1,4-divinylbenzene gives a cross-linked network polymer of the type shown in Figure 29.1. Show by drawing structural formulas how incorporation of a few percent of 1,4-divinylbenzene in the polymerization mixture gives a cross-linked polymer.arrow_forwardShow the structure of the polymer that results from heating the following diepoxide and diamine:arrow_forwardwhat is the mechanism of theses reactions? ( thermal polymerization)arrow_forward
- Give a single benefit for each polymerisation from carrying them out under a nitrogen atmosphere? (d) Of the two polymers produced (A and B) one had Mn = 12,000 and a polydispersity of 1.1 and one a Mn = 11, 200 and a polydispersity of 1.7. Identify which set of molecular weight parameters corresponds to which polystyrene sample.arrow_forwardexplain in detail the mechanism for the photoinduced step-growth polymerization of n-ethylcarbazole.arrow_forwardShow the first three steps (as far as the tetramer) in the BF3@catalyzed polymerization of propylene to form polypropylene.arrow_forward
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