Permeability of heterogeneous films cast from core-shell polymer latices

Techniques have previously been developed for the preparation of thin (10–100 μm) polymer latex films, and the measurement of their gas permeabilities. These methods have been used to study heterogeneous polymer films cast from core-shell polymer latices. Such films comprise a regular dispersion of core particles in a continuum of coalesced shell polymer. The behaviour of these films is compared with heterogeneous films cast from mixtures of two homopolymer latices, and homogeneous films cast from homopolymer and copolymer latices and from polymer solutions.