Calculate the initial radical, Chemistry

(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







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
Related Questions
what is the unabbreviated electron configuration of lanthanum

Illustrate objectives of heat treatment processes Heat treatment is normally adopted for the following: (i) To refine grain structure (ii) To improve machinability (ii

#explain any 1 example of concentration cell question..

Q. Concepts of valence bond theory? The developments can also be cited as a typical example of the manner in which scientific theories grow and are refined in any particular fi

Calculation of Number of Atoms per Unit Cell of HCP (n):  One half of the each of the 2 base centre atoms (2x1/2), one six of the every of the 12 corner atoms (12x1/6) and all



why digonal relationship made

Freons - Halogen Derivatives The chloro fluoro that is derivatives of  methane and ethane are called freons. Some of the derivatives are: CHF 2 Cl   (monochlorodifluoromethane)

Curve of potential energy versus angle of internal rotation The curve of potential energy versus angle of internal rotation is essentially identical to the curve for ethane, ex