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- W3202887316 abstract "Systematic studies on the influence of crystalline vs disordered nanocomposite structures on barrier properties and water vapor sensitivity are scarce as it is difficult to switch between the two morphologies without changing other critical parameters. By combining water-soluble poly(vinyl alcohol) (PVOH) and ultrahigh aspect ratio synthetic sodium fluorohectorite (Hec) as filler, we were able to fabricate nanocomposites from a single nematic aqueous suspension by slot die coating that, depending on the drying temperature, forms different desired morphologies. Increasing the drying temperature from 20 to 50 °C for the same formulation triggers phase segregation and disordered nanocomposites are obtained, while at room temperature, one-dimensional (1D) crystalline, intercalated hybrid Bragg Stacks form. The onset of swelling of the crystalline morphology is pushed to significantly higher relative humidity (RH). This disorder–order transition renders PVOH/Hec a promising barrier material at RH of up to 65%, which is relevant for food packaging. The oxygen permeability (OP) of the 1D crystalline PVOH/Hec is an order of magnitude lower compared to the OP of the disordered nanocomposite at this elevated RH (OP = 0.007 cm3 μm m–2 day–1 bar–1 cf. OP = 0.047 cm3 μm m–2 day–1 bar–1 at 23 °C and 65% RH)." @default.
- W3202887316 created "2021-10-11" @default.
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- W3202887316 date "2021-09-29" @default.
- W3202887316 modified "2023-10-14" @default.
- W3202887316 title "Disorder–Order Transition—Improving the Moisture Sensitivity of Waterborne Nanocomposite Barriers" @default.
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- W3202887316 doi "https://doi.org/10.1021/acsami.1c14246" @default.
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