Some aspects of matrix copolymerization
A general characteristics of the polymerization processes taking place on a matrix was presented and the kinetic and molecular effects as well as the effects of tacticity were discussed. The processes of matrix copolymerization were classified from the point of view of the type of interactions between monomers and matrix in the following groups: covalent bonds; strong intermolecular interactions of the electrostatic or hydrogen-bond type; and weak intermolecular interactions of the sorption and selective salvation type. Some examples of copolymerization with the participation of a matrix with covalently bonded functional groups (serving as a multifunctional monomer) and of amonomer with single functional group as well as of copolymerization with weak matrix—monomer interactions were discussed in detail. Equations were presented for the calculation of reactivity coefficients in the second case. The seequations take into consideration the concentrations of radicals bonded andnon-bonded with the matrix. In the first type of copolymerization with the participation of a multimethacrylate on the basis of styrene andp-cresol-formaldehyde resin it was found that the share of the matrix copolymerization was in the range of 92—97% (depending on the molecular weight of fraction) (cf. Table 1). The effect of the presence of polyethylene oxide) matrix on the average sequence length of methacrylic acid mers in its copolymers with various vinyl monomers (styrene, methyl methacrylate, acrylic acid) (cf. Table 2) was characterized.
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