Explain the differences observed in the T, and Tm values for each pair of polymers: (a) polyester A and PET; (b) polyester A andnylon 6,6. (c) How would you expect the Tm value for Kevlar (Section 31.6A) to compare with the Tm value for nylon 6,6? Explainyour prediction.polyester APETTg <0 °CTm = 50 °CT = 70 °CTm = 265 °Cnylon 6,6Tg = 53 °CTm = 265 °C

Answered: Explain the differences observed in the…

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 29.19P

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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 ?
Explain the differences observed in the Tg and Tm values for each pair of polymers: (a) polyester A and PET; (b) polyester A and nylon 6,6. (c) How would you expect the Tm value for Kevlar to compare with the Tm value for nylon 6,6? Explain your prediction.
Synthesis of Nylon 6,10 Would you expect polyester to be stabilized by hydrogen bonding? Explain
8.For end-group analysis, 0.8632 g of a carboxyl terminated polybutadiene (CTPB) sample dissolved in 1:3 mixture of ethanol and toluene consumed 5.2 ml of 0.1240 N alcoholic potassium hydroxide solution in titration using phenolphthalein as the indicator. Calculate the molar mass of the polymer.
The polyester can be mixed with additional phthalic anhydride (0.5 mole of phthalic anhydride for each mole of 1,2,3-propanetriol in the original polyester) to form a liquid resin. When this resin is heated, it forms a hard, insoluble thermosetting polyester called glyptal. Q.) Propose a structure for the repeat unit in glyptal.
What proportion of benzoic acid should be used with an equimolar mixture of adipic acid and hexamethylene diamine to produce a polymer of 10,000 molecular weight at 99.5% conversion?
The polyester can be mixed with additional phthalic anhydride (0.5 mole of phthalic anhydride for each mole of 1,2,3-propanetriol in the original polyester) to form a liquid resin. When this resin is heated, it forms a hard, insoluble thermosetting polyester called glyptal. Q.) Account for the fact that glyptal is a thermosetting plastic.
5. 1. What is the purpose of testing distilled water and laboratory ethanol in the testing of ethanol? 2. During the experiment, you recorded the vapor temperature of the samples. Does the literature B.P. of ethanol correspond to the recorded temperatures? Why or why not? 3. Based on the iodoform test, did your distillate portion contain ethanol and/or water? Explain?
1. A student wants to dry a solution of aniline in hexane. Which drying agent should he use for the task? Rationalize the choice. 2. If calcium oxide is used as a drying agent, what is obtained as a product? 3. Why is ill-advised to use P4O10 as drying agents for “wet” acetone?
1. What is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol? 2. Enumerate some pharmaceutical and medical uses of eugenol 3. What does the ferric chloride test identify? Is it specific test for eugenol? Why or why not?
Why does the nylon form at the interface of sebacoyl chloride and hexamethylene diamine?
One of the earliest commercial plastics was Bakelite®, formed by the reaction of phenol with a little more than one equivalent of formaldehyde under acidic or basic conditions. Baeyer first discovered this reaction in 1872, and practical methods for casting and molding Bakelite were developed around 1909. Phenol-formaldehyde plastics and resins (also called phenolics) are highly cross-linked because each phenol ring has three sites (two ortho and one para) that can be linked by condensation with formaldehyde. Suggest a general structure for a phenol-formaldehyde resin, and propose a mechanism for its formation under acidic conditions.

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