Robert S. Maxwell
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View article: Outgassing of casted and 3D printed silicones
Outgassing of casted and 3D printed silicones Open
Outgassing of 3D printed and casted silica-filled silicones was studied using a standard ASTM E-595 procedure and a modified Soreq’s method that allows very sensitive measurements of the outgassing kinetics even at low temperatures, 20 – 5…
View article: Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene Rubberized O-Rings: Measurements, Modeling, and Comparison with Additional Forms of Organic Getters
Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene Rubberized O-Rings: Measurements, Modeling, and Comparison with Additional Forms of Organic Getters Open
A class of molecules called “hydrogen getters” can react with, or scavenge, H2 in applications where the hydrogen presence and/or buildup are not desirable. One such “getter”, 1,4-bis(phenylethynyl)benzene or DEB, can be incorporated into …
View article: A Dielectric Relaxometry Study of Segmental Dynamics in PDMS/Boron Composite and Hybrid Elastomers
A Dielectric Relaxometry Study of Segmental Dynamics in PDMS/Boron Composite and Hybrid Elastomers Open
In this work, the motional dynamics and relaxation behavior of a series of model poly(dimethylsiloxane)-co-meta-carborane (PDMS-co-CB) hybrid elastomers have been studied in depth, using Broadband Dielectric Spectrometry over a temperature…
View article: Spectroscopic Signatures of MQ-Resins in Silicone Elastomers
Spectroscopic Signatures of MQ-Resins in Silicone Elastomers Open
Polysiloxane elastomers have a large application space due to their versatile cross-linking chemistry and highly tunable physical and mechanical properties. One approach for improving the mechanical integrity of commercial polysiloxane “si…
View article: General H<sub>2</sub>O Outgassing Model Applicable to Silica-Filled Silicones
General H<sub>2</sub>O Outgassing Model Applicable to Silica-Filled Silicones Open
Moisture induced aging and degradation are continuing concerns in long-term storage and use of silicone materials. The silica fillers frequently used to provide mechanical reinforcment in silicone formulations have a high affinity for H2O …
View article: Phase Change-Driven Negative Activation Energies in Pd/Carbon-Based/Organic Getter Hydrogenation Reactions
Phase Change-Driven Negative Activation Energies in Pd/Carbon-Based/Organic Getter Hydrogenation Reactions Open
The hydrogenation of 1,4-diphenylbutadiyne (DPB) blended with carbon-supported Pd (DPB-Pd/C) in the form of pellets was investigated by isothermal-isobaric experiments at 1333 Pa of H2 and in the temperature range of 291-315 K. The extract…
View article: Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate
Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate Open
The hydrogen uptake kinetics of 1,4-bis(phenylethynyl)benzene, or DEB, mixed with palladium (Pd) on activated carbon in a rubber matrix coating on top of a porous silicone foam substrate are investigated. First, isothermal isobaric hydroge…
View article: Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers
Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers Open
The outgassing kinetics from siloxane elastomers is dominated by moisture desorption from the reinforcing silica filler and can be detrimental in moisture-sensitive applications. In this study, a custom 3D printable siloxane rubber (LL50) …
View article: Nonideality in Silicone Network Formation via Solvent Swelling and <sup>1</sup>H Double-Quantum NMR
Nonideality in Silicone Network Formation via Solvent Swelling and <sup>1</sup>H Double-Quantum NMR Open
The versatile crosslinking chemistry of poly(dimethylsiloxane) (PDMS) based materials affords a large research space in which polymers with widely varying elastomeric properties may be synthesized. Parameters such as chain length, crosslin…
View article: NMR Methodologies for the Detection and Quantification of Nanostructural Defects in Silicone Networks
NMR Methodologies for the Detection and Quantification of Nanostructural Defects in Silicone Networks Open
Here, we present and discuss a sensitive spectroscopic means of detecting and quantifying network defects within a series of polysiloxane elastomers through a novel application of 19F solution state nuclear magnetic resonance (NMR). Polysi…
View article: Ultrafast shock compression of PDMS‐based polymers
Ultrafast shock compression of PDMS‐based polymers Open
The shock response of polymers is important for a number of commercial and defense‐related applications, but it is difficult to obtain empirical shock response data over the wide range of preparations and aging conditions typically found i…
View article: Volatility of the catalytic hydrogenation products of 1,4 bis(phenylethynyl)benzene
Volatility of the catalytic hydrogenation products of 1,4 bis(phenylethynyl)benzene Open
Measurements of equilibrium vapor pressures by effusion thermogravimetry and melting points by differential scanning calorimetry reveal that the melting temperature and equilibrium vapor pressures of 1,4-bis(phenylethynyl)benzene (DEB) do …
View article: Universal Design Curves for Elastomeric Direct Ink-Writing Architectures
Universal Design Curves for Elastomeric Direct Ink-Writing Architectures Open
Direct ink writing of silicone elastomers enables printing with precise control of porosity and mechan- ical properties of ordered cellular solids, suitable for shock absorption and stress mitigation applications. With the ability to manip…
View article: Thermal aging of traditional and additively manufactured foams: analysis by time-temperature-superposition, constitutive, and finite-element models
Thermal aging of traditional and additively manufactured foams: analysis by time-temperature-superposition, constitutive, and finite-element models Open
Cellular solids or foams are a very important class of materials with diverse applications ranging from thermal insulation and shock absorbing support cushions, to light-weight structural and floatation components, and constitute crucial c…
View article: The moisture outgassing kinetics of a silica reinforced polydimethylsiloxane
The moisture outgassing kinetics of a silica reinforced polydimethylsiloxane Open
A silica-filled polydimethylsiloxane (PDMS) composite M9787 was investigated for potential outgassing in a vacuum/dry environment with the temperature programmed desorption/reaction method. The outgassing kinetics of 463 K vacuum heat-trea…
View article: Correction: Corrigendum: 3D printed cellular solid outperforms traditional stochastic foam in long-term mechanical response
Correction: Corrigendum: 3D printed cellular solid outperforms traditional stochastic foam in long-term mechanical response Open
Scientific Reports 6: Article number: 24871; Published online: 27 April 2016; Updated 25 May 2016 The Acknowledgements section in this Article is incomplete. “We would like to sincerely thank Dr. Jim Schneider of National Security Campus, …
View article: 3D printed cellular solid outperforms traditional stochastic foam in long-term mechanical response
3D printed cellular solid outperforms traditional stochastic foam in long-term mechanical response Open
3D printing of polymeric foams by direct-ink-write is a recent technological breakthrough that enables the creation of versatile compressible solids with programmable microstructure, customizable shapes, and tunable mechanical response inc…