Synthesis of water vapor barrier membrane by coating of poly(vinyl alcohol) substrate with poly(tert‐butyl acrylate)‐silica nanocomposite

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 Tg 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.

Facile Synthesis of Poly(vinyl alcohol)/α-Titanium Phosphate Nanocomposite with Markedly Enhanced Properties

“…PVA nanocomposites have high transparence in the visible light range but poor transmittance in the ultraviolet range. Moreover, because of the physical barrier effect of the TiP nanosheets, these PVA nanocomposites can be used in gas permeability and separation applications. − , Based on the results and analysis in this work, a 3 wt % addition of α-TiP is adequate to achieve comprehensive improvements in the thermal stability, mechanical properties, fire resistance, electrical conductivity, visible light transparence, and antiultraviolet function.…”

“…Poly(vinyl alcohol) (PVA), a hydrophilic and biodegradable polymer with abundant hydroxyl groups, is gaining increasing attention in various applications such as proton-exchange membranes and polymer electrolyte fuel cells, , separation applications, , permeability membranes, , drug delivery, and packaging materials. , These applications have stimulated interest in improving the properties of PVA. Many efforts have been made to prepare high-performance PVA.…”

Transparency and water vapor barrier properties of polybenzoxazine‐silica nanocomposites provided with perhydropolysilazane

“…In previous studies, we greatly improved the WVP by reacting the hydroxy groups of poly(tert‐butyl‐acrylate‐ co −2‐hydroxyethyl methacrylate) and SiH groups of perhydropolysilazane (PHPS) . Thus, we anticipate an improvement of the WVP in our PB‐hda‐silica nanocomposites because of the connections between the hydroxy groups of PB‐hda and SiH groups of PHPS.…”

Synthesis of epoxy resin–silica nanocomposites provided from perhydropolysilazane as a curing reagent and the precursor of silica domain

“…In contrast, the silica glass with less lattice defects is obtained from perhydropolysilazane (PHPS), which is a preceramic material with the repeating unit of (SiH 2 NH), by sol–gel method by curing at lower than 100°C (Figure 1). The formation of the composite with PHPS and poly( tert ‐butyl methacrylate‐ co ‐2‐hydroxymethyl methacrylate) or poly( tert ‐butyl methacrylate‐ co ‐trimethylsilyloxy ethyl methacrylate) improved the water‐vapor barrier properties of poly( tert ‐butyl methacrylate) 23. The high reactivity of monosilanyl and silanyl groups of PHPS and hydroxy group resulted in the immediate grafting of PHPS onto the organic polymer with hydroxy group by blending of PHPS and the polymer.…”