HW3_Solutions - Ch E 178 Problem Set#3 Solutions 1 Glycerol...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Ch E 178: Problem Set #3 Solutions 1. Glycerol can react with octadecanedioic acid to form a crosslinked polymer. HO OH ethylene glycol O O O HO H octadecanedioic acid OH HO OH glycerol a. Describe the chemical reactions that would occur when the above reagents are mixed. Condensation reactions occur. Ethylene glycol is an f=2 base, glycerol is an f=3 base, and ctadecanedioic acid is a f=2 acid. Glycerol reacting will lead to crosslinking. O O O O 7 O O O O 7 * O O O O 7 O O O O O 7 O n (for example) O O 7 O O m b. Calculate the extent of reaction (p –also called degree of conversion) at which gelation occurs for: i. Stoichiometric amounts of octadecanedioic acid and glycerol Assume a basis of 1mol each octadecanedioic acid and 1mol glycerol . Since glycerol has a base functionality and is f=3, we will now call all OH groups “A” and all acids=B. 1mol octadecanedioic acid * 2 B groups/octadecanedioic acid = 2mol B groups
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon