T 2.54) [d.sub.2], [D.sub.MMA] diffusivity of MMA in the MMA-PMMA system ([m.sup.2] [s.sup.-1] [D.sub.n] dead polymer molecule having n repeat units DP degree of polymerization [E.sub.d], [e.sub.p], activation energies for initiation, and [E.sub.t] propagation, and termination reactions, respectively (kJ [mol.sup.-1]) f initiator efficiency [f.sub.dof] fraction of the total height of reaction mass which is in focus [f.sub.1] fraction of [DELTA][a.sub.initial] by which the initial bin has grown from size [a.sub.min] G growth rate of a bubble (m [s.sup.-1]) [G.sub.M2], [G.sub.2M] Gibbs energy of interaction between monomer and polymer, and vice-versa I initiator (AIBN, 2,2 azobis-iso-
butyronitrile) [I.sub.0] concentration ot initiator at t = 0 (mol [m.sub.-3]) [J.sub.i] parameters in Eq.
tert- and (acrylic or butyl methacrylic ester) peroxypivalate) and 2,2'- azobisiso-
butyronitrile olefinically emulsion redox couple unsaturated (peroxide and monomer sulfinic acids) and iron salt and vanadium salt olefinically emulsion peroxide generating unsaturated or aqueous enzyme (e.g.