Multimonomer partitioning in latex systems with moderately water-soluble monomers

Simple equations describing monomer partitioning in latices during intervals 2 and 3 in emulsion polymerization with any number of low to moderately water soluble monomers were derived from the extended Morton equation by making various assumptions. It appears that it is mainly the combinatorial entropy of mixing that governs the partitioning behavior, and that other contributions to the free energy of the monomers in the polymer particles are marginal. Experimental results with styrene, methyl methacrylate, and methyl acrylate confirm the validity of the assumptions. In interval 3 of emulsion polymerization the sum of all contributions to the free energy of the monomers in the particles other than the combinatorial entropy of mixing can be taken as a constant that is dependent only on the monomer composition in the particles and independent of the degree of swelling of the particles. The only parameters one needs to know to calculate the monomer concentrations in all phases with help of the derived equations, are the saturation concentrations of each monomer in the polymer particles, and the saturation concentrations of each monomer in the aqueous phase. © 1994 John Wiley & Sons, Inc.     

Calorimetric study of cross-linking polymerization of methyl methacrylate in the presence of a multimonomer

The kinetics of free-radical cross-linking polymerization of methyl methacrylate (MM) in the presence of poly[2-(10-undecenoyloxy)ethyl methacrylate] (PUDEM) as a macromolecular cross-linker has been isothermally examined within the temperature range from 85–100°C using the differential scanning calorimetry (DSC). The activation energy found for this reaction, E _a=89.3 kJ mol^–1, exceeds slightly the literature values of activation energy obtained for the mass polymerization of MM without any cross-linking agent. The activation energy has been also determined by the isoconversion method. It has been found that E _a decreases with the increase in the conversion, which may indicate a change in the reaction mechanism.This work was partly supported by the Committee for Research (KBN) in the framework of project No. 7 T08E 026 20     

Thermal Analysis of Ladder Polymers Obtained From Multimonomers

Differential scanning calorimetry and thermogravimetry were used to examine the thermal behaviour of the multimonomers poly(2-methacryloyloxyethyl methacrylate) and poly(2-acryloyloxyethyl methacrylate), of the ladder polymers prepared by the template polymerization of these multimonomers, and of a linear analogue of the ladder polymers, poly(2-butyrylethyl methacrylate). The results obtained show that only one of the ladder polymers has a considerably higher thermal stability than that of their linear analogue. This revised version was published online in August 2006 with corrections to the Cover Date.