d) Provide the structure for the chain end group X that would result from chaintermination through the following termination mechanism:• Disproportionation:Structure of X =• Chain end radical recombination:Structure of X =• Hydrogen abstraction:Structure of X =d) Early in the polymerization at lower conversion of the MVK monomer, thepolymer chains formed are primarily linear. However, close to the end of thereaction, as most of the monomer is consumed, branched polymers may startto appear. Propose a possible rationale for the formation of branched polymerstructures (hint: consider the types of termination reactions that may competewith polymerization when only little monomer is still present).32linear vs.branched

d)Detail solution is given in below step e.) Branched polymers form due to increased termination…

Answered: d) Provide the structure for the chain…

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter23: Polymeric Materials And Soft Condensed Matter

Section: Chapter Questions

Problem 24AP

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Similar questions

What is the basic mechanism of an Anionic polymer (acrylic acid based as carbomers) in regards to function and “activation”? How do they work and thicken?
Olefin polymerization is responsible for producing over 100 million tons per year of plastic material. (a) Briefly describe the type of catalysts used in the transition metal catalysed homogeneous polymerization reactions. (b) How are the catalysts activated? (c) Draw the active catalyst, and indicate how the polymer chain is propagated. (d) Suggest a possible chain termination step. (e) Certain single-site catalysts are capable of selectively forming different types of polypropylene. Describe these different types of polymer, and the characteristics of the catalysts that form them.
Addition (chain-growth) polymerization reactions often terminate by combination or disproportionation. However, there is another class of deactivation reactions, called chain transfer reactions, which are usually relevant to the final degree of polymerization (dp). How might you expect the dp of a polymerization reaction deactivated by chain transfer compare/contrast with polymerizations terminated by combination or disproportionation?
• What do you mean by auto-acceleration? • List down the factors that affect the cationic polymerization. Fill in: Unlike free radical polymerization, the termination in cationic polymerization occurs by -----. • In cationic polymerization, Dp increases with ---- in polarity, ---- in T and ---- in acidity.
Write chemical reactions illustrating a polymerization mechanism involving the monomers listed below. Would the reactions be considered step growth or chain growth? Explain and support
d) Early in the polymerization at lower conversion of the MVK monomer, the polymer chains formed are primarily linear. However, close to the end of the reaction, as most of the monomer is consumed, branched polymers may start to appear. Propose a possible rationale for the formation of branched polymer structures (hint: consider the types of termination reactions that may compete with polymerization when only little monomer is still present). 로 3 3 linear vs. branched
Monomers/initators used in free radical polymerization i) What monomer can be used with benzoyl peroxide and under what conditions? ii) What monomer can be used with di-tert-butyl peroxide and under what conditions? iii) What monomer can be used with hydrogen peroxide and under what condition?
Use mechanisms to show how monomers polymerize under acidic, basic, orfree-radical conditions. For chain-growth polymerization, determine whether the reactive end is more stable as a cation (acidic conditions), anion (basic conditions), or free radical (radical initiator). For step-growth polymerization, consider the mechanism of the condensation.
Which one of the following initiators can be used for free radical chain-growth polymerization? a) benzoyl peroxide b) BF3 c) CH3CH2CH2CH2Li d) Al(CH2CH3)3, TiCl4
What is the degree of polymerization of each of the following polymers with molar mass 100,000 g/mol ? (a) polyacrylonitrile (b) polycaprolactam (c) poly(trimethylene ethylene-urethane) [Ans. (a) 1887; (b) 885; (c) 532] 1.3
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Shown below is the ε-caprolactone monomer where the biopolymer polycaprolactone (PCL) is synthesized from. (a) What is the functionality of the monomer? (b) What is polymerization mechanism to produce PCL? (c) Draw the repeating unit of the homopolymer given that the functional group is located at the terminal of the hydrocarbon chain

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