Gas uptake of 3D printed acrylonitrile butadiene styrene using a vacuum apparatus designed for absorption and desorption studies

Abstract

We describe a vacuum apparatus for determining the outgassing rate into vacuum, the diffusion coefficient, and the amount of gas absorbed for various materials. The diffusion coefficient is determined from a model applied to time-dependent desorption data taken using a throughput method. We used this method to determine the diffusion coefficient, D, for H2O in 3-D printed acrylonitrile butadiene styrene (ABS). We found DH2O = 8.3 × 10−8 cm2/s ± 1.3 × 10−8 cm2/s (k = 1; 67% confidence interval) at 23.2 °C. This result was compared to the diffusion coefficient determined another by a gravimetric method, in which the sample weight was monitored as it absorbed gas from the atmosphere. The two methods agreed to within 3%, which is well within the uncertainty of the measurement. We also found that at least 80% of the atmospheric gas (air) absorbed by the ABS is water. The total amount of all atmospheric gas absorbed by ABS was about 0.35% by weight when exposed to ambient air in the laboratory, which was at a pressure of 101 kPa with a relative humidity of 57% at 22.2 °C.

Atomic layer deposited aluminum oxide mitigates outgassing from fused filament fabrication–based 3-D printed components

“…3-D printed ABS has a higher WVR value (0.25%) compared to PC (0.14%) [40]. In fact, it has been reported that at least 80% out of all gas absorbed in ABS is water vapour [41] and that most water vapour selectively outgasses in the mTorr pressure range [42][43]. In this study, all outgassing data was collected below 1 mTorr, indicating that ABS had dehydrated more effectively.…”

Toward 3D printed hydrogen storage materials made with ABS‐MOF composites

“…In support of this assertion, we have previously determined that water was adsorbed by 3D printed ABS at a capacity of 0.35% w/w. 29 Similarly, Cohen and coworkers have shown that MOFs within a polymer matrix are less susceptible to humid conditions. 17,20 While we are working with a degraded form of MOF-5 in our composites, further measurements of H 2 uptake by our 3D printed objects remain valuable.…”

Vacuum furnace for degassing stainless-steel vacuum components

“…This technique has been used previously by the authors and is described in detail in other publications. 1,16 Briefly, the gate valve was placed between an all-metal valve and a spinning rotor gauge as shown in Figure 6(b). The GV remained in an open position and never closed during the outgassing measurement.…”