(1) Explain the following polymerization mechanism by showingpropagation reactions with the catalyst three times (draw chemicalstructures of the intermediates of the first, second, and third reactionwith the monomer and catalysts).LnW=CHR'tanda(2) Why is HT-3-hexyl polythiophene better in conductivity than otherregioisomers? Explain the reasons from the intramolecular andintermolecular aspects, respectively.

Step 1:Polymerization Mechanism with catalyst:The way the polymerization mechanism works is similar…

Answered: (1) Explain the following…

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter29: Organic Polymer Chemistry

Section: Chapter Questions

Problem 29.11P

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A new atactic polymer has a Tg of -12°C If the isotactic form was made instead, what is its Tg likely to be higher or lower? why. Would you expect which stereoisomer above will exhibit melting temperature Tm ?
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Poly(butylene terephthalate) is a hydrophobic plastic material widely used in automotive ignition systems. Suggest what monomers might be used to synthesize this polymer and how the polymerization might beaccomplished.
Order the following monomers with respect to their expected reactivity toward anionic polymerization, and explain your answer:
Order the following monomers with respect to their expected reactivity toward cationic polymerization, and explain your answer:
A sample of polystyrene is composed of a series of fractions of different sized molecules. a)Calculate the number average and weight average molecular weights of this sample as well as the PDI. Comment on the PDI – is it polydispersed? b)How would adding styrene oligomer change the average molecular weights? Added amount is 5 wt. % of polymer mass and M = 1,000 g/mol. c)What would be the potential polymerisation pathways you may follow to polymerise this polymer d)What would happen if you fractionate the polymer to remove all fractions above 20,000 Da and 50% of any fraction above 15,000 Da? Recalculate the Mn, Mw, and PDI for this new system. e)What type of polymeric materials does this distribution of Mw for the new system corresponds to? Would it be likely solid or liquid at room temperature and atmospheric pressure?
Outline the experimental method used to prepare Hydrogels/ Cryogels by Free Radical Polymerization technique in the lab.
2 Propose preparative routes to the following polymers or prepolymers from monomers. Give monomer structure and, if you think important, monomer ratios, catalysts, temperatures, etc.
Predict the order of reactivity (and justify your prediction) of the given monomers. Styrene, 2-vinylpyridine, 3-vinylpyridine, and 4-vinyl pyridine in anionic polymerization. Styrene, p-methoxystyrene, p-chlorostyrene, and p-methylstyrene in cationic polymerization. and Sketch the average number molecular weight as a function of monomer conversion for the following processes: condensation polymerization and free radical polymerization. Explain the differences.
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Network phenol-formaldehyde; linear and heavily crosslinked cis-isoprene State whether it is possible to determine whether one polymer is more likely to crystallize than the other. If it is possible, note which is the more likely and then cite reason(s) for your choice. If it is not possible to decide, state why.
explain in detail the mechanism for the photoinduced step-growth polymerization of n-ethylcarbazole.

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