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Synthesis of water vapor barrier membrane by coating of poly(vinyl alcohol) substrate with poly( tert ‐butyl acrylate)‐silica nanocomposite
Author(s) -
Saito Reiko,
Nakagawa Daisuke
Publication year - 2009
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1264
Subject(s) - materials science , vinyl alcohol , nanocomposite , butyl acrylate , methacrylate , polymer chemistry , chemical engineering , substrate (aquarium) , composite number , acrylate , layer (electronics) , composite material , polymer , copolymer , geology , oceanography , engineering
Abstract To prepare a water vapor barrier membrane, organic/silica nanocomposites were used with perhydropolysilazane (PHPS) and poly( tert ‐butyl acrylate) (P(tBA)) or poly( tert ‐butyl acrylate‐ co ‐2‐hydroxyethyl methacrylate) (TBAH) on a poly(vinyl alcohol) (PVA) substrate. Water vapor permeability coefficient, Q , of the coated PVA substrates was measured. To prevent crack formation in the organic/silica nanocomposite layer, P(tBA) or TBAH with lower T g than that of PVA was inserted as a stress relaxation layer between the PVA substrate and the composite layer. The insertion of the stress relaxation layer drastically decreased the Q value. The lowest Q value was observed especially when TBAH was inserted between TBAH/silica nanocomposite layer and the PVA substrate. Observation with a scanning electron microscope (SEM) did not show any crack both in the composite layer and near the interface between layers. It would be due to the good compatibility of the TBAH stress relaxation layer to the TBAH/silica nanocomposite layer and to the PVA substrate. Copyright © 2008 John Wiley & Sons, Ltd.