Here we present the formation of the thin layer of polymers onto porous mesoporous and macroporous substrates via dip coating of latex solutions. We investigated four commercially available latex solutions: polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), polyvinylidene chloride (PVDC), and polyolefin-based latex (Hypod). Our results show that both characteristics of the latex solution (glass transition temperature (Tg), particle size, crystallinity) and the characteristics of the porous substrate (pore size and hydrophobicity) impact the film formation. We confirmed the defect-free, barrier nature of our latex thin films through scanning electron microscopy (SEM), atomic force microscopy (AFM), and hydraulically driven water permeation tests. Dry latex film thickness on porous substrates varies as a function of the solid content of the latex solution. We obtained defect-free films from PVDC and hypod on mesoporous substrates by a slower evaporation rate from these �soft� polymers (Tgs < room temp). For latexes of PTFE and PFA which are hard polymers (Tgs ? room temp) after drying the particles on porous substrates retain their original size and shapes, and as a result they cannot make continuous film.

Latex barrier film formation on porous substrates

248th National Meeting (2014)

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