The phosphoric acid diester (phosphodiester) plays an important role in the higher order structures and functions of biomolecules as a partial structure of DNA, RNA, and ATP as well as many insecticides, herbicides, and nerve agents. When these organophosphates are used as pesticides, herbicides, and nerve agents, their decomposition studies are very important for both industry and military purposes. In this work, we prepared polyurethane (PU) composite films containing UiO-66 for the decomposition 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 PU 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 MPO decomposition by the UiO-66/PU composite films increased with the increase of the UiO-66 content and hydrolysis time. In the case of the 21.2 wt% UiO-66-dispersed PU composite film, 48% of MPO was decomposed within 3 h. This was similar to the decomposition value by a UiO-66 slurry (52%) under the same decomposition conditions. Unlike the UiO-66 slurry, the 21.2 wt% of UiO-66-dispersed composite film maintained a similar MPO decomposition performance after 10 repeated experiments.

Decomposition of a nerve agent simulant using UiO-66/PU composite films

2019 Spring National Meeting

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