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) Calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number-average molar mass of 750 kg mol-¹ by bulk polymerization at 60 °C. Assume: (i) the initiator is 60% efficient; (ii) the rate coefficients for initiator dissociation, propagation and termination are, respectively, 2x 10-6 s-¹, 341 dm³ mol-¹ s¹ and 4x 107 dm³ mol s¹; (iii) the density of styrene at the polymerization temperature is 0.88 g cm³; and (iv) that ter- mination by disproportionation, and chain transfer to initiator and monomer, are negligible.

) Calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number-average molar mass of 750 kg mol-¹ by bulk polymerization at 60 °C. Assume: (i) the initiator is 60% efficient; (ii) the rate coefficients for initiator dissociation, propagation and termination are, respectively, 2x 10-6 s-¹, 341 dm³ mol-¹ s¹ and 4x 107 dm³ mol s¹; (iii) the density of styrene at the polymerization temperature is 0.88 g cm³; and (iv) that ter- mination by disproportionation, and chain transfer to initiator and monomer, are negligible.

Chemistry
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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a) Calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number-average molar mass of 750 kg mol-¹ by bulk polymerization at 60 °C. Assume: (i) the initiator is 60% efficient; (ii) the rate coefficients for initiator dissociation, propagation and termination are, respectively, 2x 10-6 s-¹, 341 dm³ mol-¹ s-¹ and 4x 107 dm³ mol s¹; (iii) the density of styrene at the polymerization temperature is 0.88 g cm3; and (iv) that ter- mination by disproportionation, and chain transfer to initiator and monomer, are negligible. 4
Transcribed Image Text:a) Calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number-average molar mass of 750 kg mol-¹ by bulk polymerization at 60 °C. Assume: (i) the initiator is 60% efficient; (ii) the rate coefficients for initiator dissociation, propagation and termination are, respectively, 2x 10-6 s-¹, 341 dm³ mol-¹ s-¹ and 4x 107 dm³ mol s¹; (iii) the density of styrene at the polymerization temperature is 0.88 g cm3; and (iv) that ter- mination by disproportionation, and chain transfer to initiator and monomer, are negligible. 4
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