posted on 2024-03-19, 14:06authored bySantosh Adhikari, Douglas J. Safarik, John R. Stockdale, Xavier M. Torres, Adam Pacheco, Shelbie A. Legett, Andrea Labouriau
Hydrogen getters consisting of 1,4-bis[phenylethynyl]
benzene (DEB)
and a carbon-supported palladium catalyst (Pd/C) have been used to
mitigate the accumulation of unwanted hydrogen gas in a sealed system.
Here, we report the formulation of a composite resin consisting of
silicone polymer plus DEB-Pd/C as an active getter material and the
additive manufacturing of silicone getter composites with a high getter
content (up to 50 wt %). NMR and DSC studies suggest no reaction between
the silicone polymer resin and DEB even at elevated curing temperatures
(75 °C). Getter composites with varying amounts of getter and
filler were formulated, and their rheological properties were studied.
The two composite resins with good printability parameters and different
getter contents were chosen to make 3D-printed samples. The hydrogen
absorption capacity of these samples was studied at a low hydrogen
pressure of 750 mTorr of pure hydrogen. The getter composite with
50 wt% of getter showed normalized DEB conversion of 83%, with the
hydrogen adsorption capacity of 100.2 mL of H2 per gram
of polymer getter composite.