Metal-organic framework (UiO-66)-dispersed polyurethane composite films for the decontamination of methyl paraoxon

Abstract

Polyurethane (PU) composite films containing UiO-66 were prepared for the decontamination of methyl paraoxon (MPO), an organophosphate-type nerve agent simulant. Waterborne PU dispersions were synthesized by changing the type of polyol to improve the miscibility with UiO-66. Depending on the size of the polyol, the PU films had different surface free energy, flexibility and compatibility with UiO-66. UiO-66 was well dispersed in PU films when the flexibility of the films increased. The tensile strength of the UiO-66/PU composite films gradually increased from 7.5 to 11.3 MPa with increasing UiO-66 content, but the elongation decreased from 781 to 120%. The decomposition of MPO by the UiO-66/PU composite films increased with an increase of the UiO-66 content and hydrolysis time. In the case of the 21.2 wt% UiO-66/PU composite film, 48% of MPO was decomposed within 3 h. This was similar to the decomposition when using a UiO-66 slurry (52%) under the same decomposition conditions. Unlike the UiO-66 slurry, the 21.2 wt% UiO-66/PU composite film maintained a similar MPO decomposition performance after 10 repeated experiments. (c) 2019 Society of Chemical Industry