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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Characterizing phenol–formaldehyde adhesive cure chemistry within the wood cell wall
Not provided.
Molecular basis for Ras suppressor-1 binding to PINCH-1 in focal adhesion assembly
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Effects of Lu on the α-Al2O3/β-NiAl interface adhesion from first-principles calculations
Not provided.
Patterned nickel interlayers for enhanced silver wetting, spreading and adhesion on ceramic substrates
Not Available
Conformational Plasticity in the Transsynaptic Neurexin-Cerebellin-Glutamate Receptor Adhesion Complex
Not Available
CELSR1, a core planar cell polarity protein, features a weakly adhesive and flexible cadherin ectodomain
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Quantitative measurement of cation-mediated adhesion of DNA to anionic surfaces
Single molecule force spectroscopy quantifies divalent-cation-mediated attraction of double-stranded DNA to an anionic self-assembled monolayer.
Importance of corners in fracture of highly crosslinked polymeric adhesives
In this study, very large molecular dynamics simulations with open ends between two solid adherends have been performed treating tensile deformation of coarse-grained, highly crosslinked polymer networks modeling epoxy systems. The open boundary and the presence of corners dramatically alter the fracture behavior. In contrast to systems with periodic boundaries, the failure strain decreases with increasing system size until a critical size is reached. This decrease greatly reduces the difference in the crack initiation strains between simulation and experiment. In the open geometry, the sides of the polymer network contract inward forming wedge shaped corners. The stress and strain are concentrated in the corners where the shear component is present and large. The nonuniformity of the strain results in accumulation of bond breaking in the corners and crack initiation there. Lastly, t the corner strain is system size dependent, which results in a system size dependence of the failure strain.
Preventing mussel adhesion using lubricant-infused materials
Not provided.
Rapid adhesive bonding of thermoplastic composites and titanium with thermoplastic adhesives
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Survey of Adhesives and Adhesion
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Temperature Effects on Adhesive Bond Strengths and Modules for Commonly Used Spacecraft Strucutral Adhesives
No abstract available
Adhesive Joint Failure and the Aging of Adhesive Joints.
Abstract not provided.
Data-Driven Degradation Study of Interfacial Adhesion Under Accelerated Aging: Adhesively Bonded Cu and Polyimide in Flexible Printed Circuit Boards (PCBs)
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Urethane/Silicone Adhesives for Bonding Flexing Metal Parts
Adhesives that are blends of commercially available urethane and silicone adhesives have been found to be useful for bonding metal parts that flex somewhat during use. These urethane/silicone adhesives are formulated for the specific metal parts to be bonded. The bonds formed by these adhesives have peel and shear strengths greater than those of bonds formed by double-sided tapes and by other adhesives, including epoxies and neat silicones. In addition, unlike the bonds formed by epoxies, the bonds formed by these adhesives retain flexibility. In the initial application for which the urethane/silicone adhesives were devised, there was a need to bond spring rings, which provide longitudinal rigidity for inflatable satellite booms, with the blades that provide the booms axial strength. The problem was to make the bonds withstand the stresses, associated with differences in curvature between the bonded parts, that arose when the booms were deflated and the springs were compressed. In experiments using single adhesives (that is, not the urethane/ silicone blends), the bonds were broken and, in each experiment, it was found that the adhesive bonded well with either the ring or with the blade, but not both. After numerous experiments, the adhesive that bonded best with the rings and the adhesive that bonded best with the blades were identified. These adhesives were then blended and, as expected, the blend bonded well with both the rings and the blades. The two adhesives are Kalex (or equivalent) high-shear-strength urethane and Dow Corning 732 (or equivalent) silicone. The nominal mixture ratio is 5 volume parts of the urethane per 1 volume part of the silicone. Increasing the proportion of silicone makes the bond weaker but more flexible, and decreasing the proportion of silicone makes the bond stronger but more brittle. The urethane/silicone blend must be prepared and used quickly because of the limited working time of the urethane: The precursor of the urethane adhesive is supplied in a two-part form, comprising a resin and a hardener that must be mixed. The resulting urethane adhesive has a working time of 3 to 5 minutes. To prepare the urethane/silicone blend, one must quickly add the silicone to the urethane adhesive and mix it in thoroughly within the working time of the urethane. Once the urethane/silicone blend has been mixed and applied to the bond surfaces, it takes about 2 hours for the adhesive to cure under pressure. However, it takes about 24 hours for the adhesive to reach full strength.