Problem 1: It is desired to prepare polyester with the number average molecular weight, M₁~ 5000 g/mol by reacting of 1 mol butane-1,4 diol (HO-CH2-CH2-CH2-CH2-OH) with 1 mol of adipic acid (HOOC-CH2-CH2-CH2-CH2-COOH). (a) Write chemical equation illustrating synthesis of the polyester. (b) Calculate the value of the monomer conversion at which the reaction should be stopped to obtain this polymer, assuming perfect stoichiometric balance. What would be polydispersity index for the polymer obtained? (c) Assuming that 0.5 mol % of the diol is lost to polymerization by a side reaction (dehydratation to a non-reactive substance), what would be the value of M₁ if the reaction was carried out to the same extent as in part (b). (d) For the polymerization process value of polymerization rate constant is 1.5*10-2 L/(mol*s) at 100° C. How long would it take to prepare the polyester with the number average molecular weight, M₁5,000 g/mol at 100 °C? There is no diol loss for this part of the problem. Hint: all equations for step-growth polymerization include concentrations of functional groups

Problem 1: It is desired to prepare polyester with the number average molecular weight, M₁~ 5000 g/mol by reacting of 1 mol butane-1,4 diol (HO-CH2-CH2-CH2-CH2-OH) with 1 mol of adipic acid (HOOC-CH2-CH2-CH2-CH2-COOH). (a) Write chemical equation illustrating synthesis of the polyester. (b) Calculate the value of the monomer conversion at which the reaction should be stopped to obtain this polymer, assuming perfect stoichiometric balance. What would be polydispersity index for the polymer obtained? (c) Assuming that 0.5 mol % of the diol is lost to polymerization by a side reaction (dehydratation to a non-reactive substance), what would be the value of M₁ if the reaction was carried out to the same extent as in part (b). (d) For the polymerization process value of polymerization rate constant is 1.510-2 L/(mols) at 100° C. How long would it take to prepare the polyester with the number average molecular weight, M₁5,000 g/mol at 100 °C? There is no diol loss for this part of the problem. Hint: all equations for step-growth polymerization include concentrations of functional groups

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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