24 Result(s)
within
T. P. Russell
Characterization and Evaluation of Materials
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Article
Fatigue resistance of silane-bonded epoxy/glass interfaces using neat and rubber-toughened epoxies
The influence that the energy absorbing ability of an epoxy has on the cyclic fatigue resistance of a silane-bonded epoxy/glass interface in moist air was studied using the double cleavage drilled compression ...
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Article
Crystalline structure of a liquid crystal forming ligated twin
The solid state crystalline structure of a low molecular weight ligated dimer twin has been examined by TEM and x-ray diffraction methods. In this material each twin consists of a short, central rigid three ph...
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Article
Fatigue of Silane Bonded Epoxy/Glass Interfaces
Fatigue (slow) crack growth in silane bonded epoxy/glass interfaces was studied under static and cyclic loading at 23°C, 95% RH using the double cleavage drilled compression test. Crack growth rates under cycl...
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Article
Characterization of thin Polymeric Nanofoam films by Transmission Electron Microscopy and Small Angle Neutron Scattering
Thin film polymer nanofoams are produced from triblock copolymers of a fluorinated polyimide, 3F/PMDA (derived from pyromelletic dianhydride (PMDA) and 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane (3F...
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Article
Electric Field Induced Control of Thin Film Diblock Copolymer Domain Orientation
Local control of domain orientation in diblock copolymer thin films is demonstrated through the use of external electric fields. Thin films of a polystyrene-polymethylmethacrylate diblock copolymers, denoted P...
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Article
Nanofoam Porosity Measured by Infrared Spectroscopy and Refractive Index
Infrared spectroscopy and optical waveguide were used to determine the porosity of polymer nanofoams produced from block copolymers of an aromatic polyimide endcapped with either poly(propyIene oxide) or poly(...
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Article
Characterizing Polymer Surfaces and Interfaces
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Article
Time Resolved Emission Studies of Aluminum and Water High Pressure Reactions
The detonation of underwater explosives is a complex problem involving a temporally dependent heterogeneous reaction regime of oxidizer reactions and high pressure metal combustion. For simplicity, underwater ...
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Article
Polyimide Nanofoams For Low Dielectric Applications
Foamed polyimides have been developed in order to obtain thin film dielectric layers with very low dielectric constants for use in microelectronic devices. In these systems the pore sizes are in the nanometer ...
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Article
Resonance Enhanced Neutron Standing Waves in Thin Films
Simultaneous measurements of neutron reflectivity and prompt gamma ray emission, from samples with buried Gd layers, are shown to be of significant aid in determining the depth profile of the entire sample. Becau...
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Article
Time-resolved SAXS studies of morphological changes in cold crystallized poly(ethylene terephthalate) during annealing and heating
Structural changes occurring during crystallization of quenched amorphous poly(ethylene terephthalate) (PET) and subsequent cooling/heating cycles have been studied by real-time small-angle x-ray scattering (S...
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Article
On the microphase separation kinetics of symmetric diblock copolymers
Time-resolved small-angle x-ray scattering studies were performed on symmetric diblock copolymers of polystyrene and poly(methyl methacrylate), P(S-b-MMA). Freeze-dried powders of P(S-b-MMA) having a molecular...
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Chapter and Conference Paper
Evolution of Ordering in Thin Films of Symmetric Diblock Copolymers
The manner in which thin films of asymmetric diblock copolymer of polystyrene and poly(methyl methacrylate) form a multilayered structure has been investigated by transmission electron microscopy and neutron r...
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Article
High Temperature Polyimide Nanofoams
A means of generating high temperature polymer foams which leads to pore size in the nanometer regime has been developed. Nanofoams were prepared by casting block copolymers comprised of a thermally stable blo...
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Article
Pressure/Temperature/Reaction Phase Diagrams for Several Nitramine Compounds
Pressure/temperature/reaction phase diagrams for several nitramine compounds, including hexanitrohexaazaisowurtzitane (HNIW), 1,3,5-trinitrohexahydro-1,3,5-triazine (RDX), ammonium dinitramide (ADN), and p-nit...
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Article
Solvent and Curing Effects on Diffusion at Polyimide Interfaces
Interdiffusion at interfaces between deuterated polyamic acid (d-PAA) and polyimide (PI) films was investigated with forward recoil spectrometry, an ion beam analysis technique. The PI films were prepared by spin...
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Article
The Morphology of Symietric Diblock Copolymers as Revealed by Neutron Reflectivity
The specular reflectivity of neutrons has been used to characterize quantitatively the microphase separated morphology of symmetric, diblock copolymers of polystyrene, PS and polymethylmethacrylate, PMMA, as a...
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Article
Temperature Dependence of the Morphology of Thin Diblock Copolymer Films as Revealed by Neutron Reflectivity
The order-disorder transition in thin films of symmetric diblock copolymers of polystyrene and polymethylmethacrylate has been investigated by neutron reflectivity. At temperatures above the order-disorder tem...
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Article
Neutron Reflection Study of Surface Enrichment in an Isotopic Polymer Blend
We have measured neutron reflectivities from the surface of films of deuterated polystyrene (d-PS) and protonated polystyrene (PS) blends before and after annealing, and used the results to determine the conce...
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Article
Solvent and Curing Effects on Diffusion at Polyimide Interfaces
Interdiffusion at interfaces between deuterated polyamic acid (d-PAA) and polyimide (PI) films was investigated with forward recoil spectrometry, an ion beam analysis technique. The PI films were prepared by spin...
