Chapter 26: Q10P (page 1330)
Draw the structure of isotactic poly(acrylonitrile) and syndiotactic polystyrene.
Short Answer
1)
2)
Chapter 26: Q10P (page 1330)
Draw the structure of isotactic poly(acrylonitrile) and syndiotactic polystyrene.
1)
2)
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Get started for freePolyoxymethylene (polyformaldehyde) is the tough, self-lubricating DelrinR plastic used in gear wheels.
(a) Give the structure of polyformaldehyde.
(b) Formaldehyde is polymerized using an acidic catalyst. Using H+ as a catalyst, propose a mechanism for the polymerization as far as the trimer.
(c) Is Delrin an addition polymer or a condensation polymer?
(a) Propose a mechanism for the reaction of bisphenol A with phosgene.
(b) Diethyl carbonate serves as a less-toxic alternative to phosgene for making Lexan. Propose a mechanism for the transesterification of diethyl carbonate with bisphenol A, catalyzed by a trace of sodium ethoxide. What small molecule is given off in this condensation?
The polyester named LactomerRis an alternating copolymer of lactic acid and glycolic acid. Lactomer is used for absorbable suture material because stitches of Lactomer hydrolyze slowly over a two-week period and do not have to be removed. The hydrolysis products, lactic acid and glycolic acid, are normal metabolites and do not provoke an inflammatory response. Draw the structure of the Lactomer polymer.
Explain why the addition of a small amount of glycerol to the polymerization mixture gives a stiffer urethane foam.
. Poly (trimethylene carbamate) is used in high-quality synthetic leather. It has the structure shown.
(a) What type of polymer is poly (trimethylene carbamate)?
(b) Is this a chain-growth polymer or a step-growth polymer?
(c) Draw the products that would be formed if the polymer were completely hydrolyzed under acidic or basic conditions.
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