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6. In free-radical polymerization, (a) Calculate a number-average molar mass of polystyrene prepared by bulk radical polymerization. 1279 g/mol (b) If the light lamp is suddenly broken in the middle of initiation stage, explain briefly possible variations in the rate of polymerization and degree of polymerization. No need to use equations. Assumptions: (1) The initial concentration of the benzophenone as an initiator is 3.3×10-3 mol/dm³; (2) Quantum yield of benzophenone is 0.8; (3) Molar absorptivity of the initiator is 4.34×103 L/mol-cm; (4) Intensity of incident light is 1200 μmol/m²-s; (5) The rate coefficients for propagation and termination are 341 and 4×107 dm³/mol-s, respectively; (6) The density of styrene at the polymerization temperature is 0.88 g/cm³; (7) Termination by disproportionation is negligible; (8) Chain transfer is negligible; (9) Neglect contributions from end groups; (10) The ultraviolet light lamp (365 nm in wavelength) is used in this experiment; (11) Steady state condition. Hint: 1 L 1 dm³.

6. In free-radical polymerization, (a) Calculate a number-average molar mass of polystyrene prepared by bulk radical polymerization. 1279 g/mol (b) If the light lamp is suddenly broken in the middle of initiation stage, explain briefly possible variations in the rate of polymerization and degree of polymerization. No need to use equations. Assumptions: (1) The initial concentration of the benzophenone as an initiator is 3.3×10-3 mol/dm³; (2) Quantum yield of benzophenone is 0.8; (3) Molar absorptivity of the initiator is 4.34×103 L/mol-cm; (4) Intensity of incident light is 1200 μmol/m²-s; (5) The rate coefficients for propagation and termination are 341 and 4×107 dm³/mol-s, respectively; (6) The density of styrene at the polymerization temperature is 0.88 g/cm³; (7) Termination by disproportionation is negligible; (8) Chain transfer is negligible; (9) Neglect contributions from end groups; (10) The ultraviolet light lamp (365 nm in wavelength) is used in this experiment; (11) Steady state condition. Hint: 1 L 1 dm³.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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6. In free-radical polymerization, (a) Calculate a number-average molar mass of polystyrene prepared by bulk radical polymerization. 1279 g/mol (b) If the light lamp is suddenly broken in the middle of initiation stage, explain briefly possible variations in the rate of polymerization and degree of polymerization. No need to use equations. Assumptions: (1) The initial concentration of the benzophenone as an initiator is 3.3×10-3 mol/dm³; (2) Quantum yield of benzophenone is 0.8; (3) Molar absorptivity of the initiator is 4.34×103 L/mol-cm; (4) Intensity of incident light is 1200 μmol/m²-s; (5) The rate coefficients for propagation and termination are 341 and 4×107 dm³/mol-s, respectively; (6) The density of styrene at the polymerization temperature is 0.88 g/cm³; (7) Termination by disproportionation is negligible; (8) Chain transfer is negligible; (9) Neglect contributions from end groups; (10) The ultraviolet light lamp (365 nm in wavelength) is used in this experiment; (11) Steady state condition. Hint: 1 L 1 dm³.
Transcribed Image Text:6. In free-radical polymerization, (a) Calculate a number-average molar mass of polystyrene prepared by bulk radical polymerization. 1279 g/mol (b) If the light lamp is suddenly broken in the middle of initiation stage, explain briefly possible variations in the rate of polymerization and degree of polymerization. No need to use equations. Assumptions: (1) The initial concentration of the benzophenone as an initiator is 3.3×10-3 mol/dm³; (2) Quantum yield of benzophenone is 0.8; (3) Molar absorptivity of the initiator is 4.34×103 L/mol-cm; (4) Intensity of incident light is 1200 μmol/m²-s; (5) The rate coefficients for propagation and termination are 341 and 4×107 dm³/mol-s, respectively; (6) The density of styrene at the polymerization temperature is 0.88 g/cm³; (7) Termination by disproportionation is negligible; (8) Chain transfer is negligible; (9) Neglect contributions from end groups; (10) The ultraviolet light lamp (365 nm in wavelength) is used in this experiment; (11) Steady state condition. Hint: 1 L 1 dm³.
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