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. When equal molar amounts of phthalic anhydride and 1,2,3-propanetriol are heated,they form an amorphous polyester. Under these conditions, polymerization is regio-selective for the primary hydroxyl groups of the triol.OHheat+ HO.LOH a polyesterPhthalic anhydride 1,2,3-Propanetriol(Glycerol)

Answered: When equal molar amounts of phthalic…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter22: Organic And Biological Molecules

Section: Chapter Questions

Problem 86E

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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.

When equal molar amounts of phthalic anhydride and 1,2,3-propanetriol are heated,
they form an amorphous polyester. Under these conditions, polymerization is regio-
selective for the primary hydroxyl groups of the triol.
OH
heat
+ HO.
LOH a polyester
Phthalic anhydride 1,2,3-Propanetriol
(Glycerol)

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