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HW3 - ChE178:ProblemSet#3 DueFriday,September19 1 Glycerol...

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Ch E 178: Problem Set #3 Due Friday, September 19 1. Glycerol can react with octadecanedioic acid to form a crosslinked polymer. HO OH ethylene glycol O OH O HO octadecanedioic acid OH HO OH glycerol a. Describe the chemical reactions that would occur when the above reagents are mixed. 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 ii. Molar ratio 1.500:0.950 octadecanedioic to glycerol iii. Molar ratio 1.500:0.980:0.750 octadecanedioic: glycerol: ethylene glycol iv. Molar ratio 1.500:0.500:0.750 octadecanedioic: glycerol: ethylene glycol c. What are the assumptions required for your answer above? Which one is least likely to be obeyed in the real polymerization? d. What is the weight ratio of glycerin to acid that must be mixed for stoichiometric balance at the start of the reaction? e. If dendrimers with n –OH groups at the terminus (where n=8 up to 128) are
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