Please help me with the question below. A detailed explanation to aid in understanding is welcome. Predict the order of reactivity (and justify your prediction): (a) in cationic polymerization: styrene, p-methoxystyrene, p-chlorostyrene, p-methylstyrene; (b) in anionic polymerization: styrene, 2-vinylpyri-dine, 3-vinylpyridine, 4-vinylpyridine.

In cationic polymerization, the order of reactivity is generally determined by the ability of the…

Answered: Predict the order of reactivity (and…

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter50: Preparation And Properties Of Polymers: Polyester, Nylon, And Polystyrene

Section: Chapter Questions

Problem 7Q

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(a) Describe the polymerization of a blend of maleic anhydride and 2-methyl-1,3- propanediol in the presence of an acid catalyst. Draw a chemical reaction scheme showing the intermediate and final products that are formed. Describe the reaction conditions that you would use to maximize the yield of polymer. (b) Draw the structure of the polymer, showing the repeat unit and end groups, that is obtained when the mole ratio of maleic anhydride to diol is 0.95 (c) What is the number average molecular weight of the polymer of Part (b) when the extent of reaction of maleic anhydride is (i) 90% and (ii) 100%. (d) Describe how the structure of the polymer is altered when it is further reacted with styrene in the presence of peroxide.
(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.
An equimolar blend of 1,4-hydroquinone diallylether and ethylene glycol dimercaptoacetate containing a small amount of benzophenone (radical photoinitiator) is polymerized by irradiating the blend with ultraviolet (UV) light. (a) Write a balanced chemical equation for the polymerization. (b) How would you classify this polymerization according to the reaction mechanism? (c) Calculate the extent of reaction needed to produce a polymer with a number average molar mass of 20,000 g/mole (neglect the effect of end groups in the calculation). (d) Draw the structure of the polymer that is obtained when the mole ratio of diallyl ether to dithiol is 1.1. (e) Explain briefly the consequences of including a tetrafunctional thiol in the polymerization with the exact stoichiometry 2:1:4 of difunctional thiol to tetrafunctional thiol to difunctional allylic ether. HS HS 1,4-hydroquinone diallylether Ethylene glycol dimercaptoacetate
Tritan is a polymer marketed to consumers looking for BPA-free products. Although the detailed structure of Tritan is protected by patent, it is known to be a polyester (not a polycarbonate) composed of three monomers—dimethyl terephthalate, 2,2,4,4- tetramethylcyclobutane-1,3-diol, and 1,4-cyclohexanedimethanol. Propose a possible structure for Tritan from dimethyl terephthalate and the two diols drawn.
trans-3-hexene and cis-3-hexene differ in one of the following ways. Which one? (A) Products of hydrogenation (B) Products of ozonlysis (C) Products of bromine (Br2) addition (D) Products of hydroboration-oxidation
(a) Compare the characteristic features of polymerization by step-growth and chain- growth mechanisms. (b) Many alkene monomers (olefins) are readily polymerized by a free-radical mechanism. However, isobutylene is usually polymerized by a cationic mechanism. Explain.
(a) Chromic acid oxidation of 4-tert-butyl-1,2-dimethylbenzene yielded a single compound having the molecular formula C12H14O4. What was this compound?(b) What product is expected from chromic acid oxidation of 2,3-dihydroindene?
Draw the organic product obtained by hydroboration-oxidation of each of the following alkenes: (a) trans-2-pentene, (b) 2-tert-butyl-3,3-dimethyl-1- butene, and (c) 1-methylcyclohexene. Having done this, draw the product of the acid-catalyzed hydration of these same alkenes. How do the reaction products differ?
What is the functionality of the following monomers in reactions with (i) styrene, C6H5CH=CH₂ and (ii) adipic acid, HOOC(CH₂)4COOH? (a) HOCH₂CH₂OH (b) H₂C=CH-CH₂OH
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>1,3-Cyclopentadiene undergoes thermal polymerization to yield a polymer that has no double bonds in the chain. Upon strong heating, the polymer breaks down to regenerate cyclopentadiene. Propose a structure for the polymer.
Excercise 2 Chloromethane reacts with hydroxide ion to form methanol as shown in the equation below. OH + CH3CI - CH3OH + CI- (a) Identify the nucleophile and electrophile. (b) State the type of reaction.

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Predict the order of reactivity (and justify your prediction): (a) in cationic polymerization: styrene, p- methoxystyrene, p-chlorostyrene, p-methylstyrene; (b) in anionic polymerization: styrene, 2-vinylpyri- dine, 3-vinylpyridine, 4-vinylpyridine.