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Extra info for Chemistry and Technology of Emulsion Polymerisation (2nd Edition)
Also Asua and his coworkers in Spain have contributed to more detailed descriptions of the mechanisms. Among other contributions, primarily in process control and reaction engineering, they have published a more detailed description of the desorption mechanism, taking also the reactions in the aqueous phase into consideration (Asua, Sudol, and El-Aasser, 1989). , 1990b). More thorough descriptions of the more recent work are given in Chapter 3. The first part of the Smith–Ewart theory, the nucleation part (Interval I) was not in the beginning debated to the same degree as the rate of polymerisation.
As long as the monomer concentration in particles is constant, as may often be the case in Interval II, this number then yields the rate of polymerisation. 3) Historic Overview 13 where ρ A is the total rate of radical absorption or entry in the particles (in molecules per unit volume), ks is the rate “constant” for desorption or exit of radicals from the particles, as the specific surface area and kt∗ the termination constant in latex particles. The particle number Nn denotes the number of particles with n-occupancy of radicals.
The particle number Nn denotes the number of particles with n-occupancy of radicals. 5. Case 2 is that which has later been most generally known as the Smith–Ewart theory and is the only case that has been given a complete treatment by Smith and Ewart. The solution for this case is also obvious from simple consideration of the situation in a randomly selected particle. 4) This means that the rate of adsorption of radicals in polymer particles is much larger than the rate of desorption (so the latter can be neglected) and much lower than the rate of termination.