(a) Given the values below, calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number average molar mass of 400,000 by bulk free radical polymerisation at 60°C, assuming all termination is by combination.

f = 0.6

kd=2×10-6 s^-1

kp= 341 M-1 s^-1

kt=4×107 M-1s^-1

density of styrene = 880 kg m^-3.

(b) Calculate the initial radical concentration and initial rate of polymerisation for this reaction.

(c) Given the values below for the activation energies of benzoyl peroxide dissociation, styrene propagation, and styrene termination, and assuming all other parameters remain constant calculate the number average molar mass, initial radical concentration, and initial rate of polymerisation if the reaction is run at 66°C rather than 60°C.

EA dissociation = 115 kJ mol^-1

EA propagation = 34 kJ mol ^-1

EA termination = 10 kJ mol^-1

Posted Date: 2/27/2013 5:22:59 AM | Location : United States

Ask an Expert

Related Discussions:- Calculate the initial radical, Assignment Help, Ask Question on Calculate the initial radical, Get Answer, Expert's Help, Calculate the initial radical Discussions

Write discussion on Calculate the initial radical
Your posts are moderated

Write your message here..

Related Questions

D block elements, Why do Zr and Hf show similar properties? Why do Zr and Hf show similar properties?

Electronegative atom on the strength of ionic bond, What is the effect of m... What is the effect of more electronegative atom on the strength of ionic bond: (1) Decreases (2) Increase (3) Decreases slowly (4) Remains the same Ans:  Increase

Salt analysis.., please tell the observation & inference, when ammonium pho... please tell the observation & inference, when ammonium phosphate (NH4)3PO4 undergoes charcoal cavity test & cobalt nitrate test.....

Dipole moment, what is dipole moment? what is dipole moment?

Salt analysis, SIr Plzz do guide me that why only 7 groups of transition el... SIr Plzz do guide me that why only 7 groups of transition element are used for salt analysis ? Others are not used for salt analysis...mean other tranistion elements?

Determine the magnitude of the horizontal component, A 4-m long curved gate... A 4-m long curved gate is located in the side of a reservoir containing water as shown in Figure. Determine the magnitude of the horizontal and vertical components of the force of

Actinium and the actinides, ACTINIUM AND THE ACTINIDES Following actini... ACTINIUM AND THE ACTINIDES Following actinium (group 3) are the 14 components of the actinide series (represented by the symbol An) combined with progressive filling of the 5

Iodoform, chemical equation of K2CO3+CH#CH@OH+I2 chemical equation of K2CO3+CH#CH@OH+I2

Calorimetry, 240 g of water at 20 degree C are mixed with a sample of iron ... 240 g of water at 20 degree C are mixed with a sample of iron at 500 degree C. The final temperature of the system is 42 degree C. Find the mass of the iron sample

Hardness of water, (a) What is hardness of water? What do you understand ... (a) What is hardness of water? What do you understand by temporary and permanent hardness?                                                            OR Explain tempora