Polyurethane membrane functionalization with the grafted cellulose derivatives to control water vapor permeability
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Abstract
Cellulose derivatives were grafted to polyurethane (PU), and the effect of grafting on water vapor permeation was evaluated. The cellulose derivative grafting did not significantly change the soft segment melting temperature; however, the grafting affected the enthalpy change for the soft segment melting. The light cross-linking by the grafted cellulose derivatives significantly increased PU tensile strength but did not affect tensile strain. Unexpectedly, water vapor permeability (WVP) at 50°C was decreased by the grafted cellulose derivative, and the decrease in WVP was particularly severe for the cellulose acetate-PU. The molecular weight and capping group of the cellulose derivative affected PU membrane WVP. In addition, the PU layer became less permeable to water vapor with the increase of cellulose derivative content because the water vapor path was restricted.
Keywords
Cellulose Permeability Grafting Elastomer Cross-linkingPreview
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