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Dynamic Viscoelastic Properties Of Poly(Ethylene-Propylene) Diblock Copolymer In The Melt State And Solutions, William Macknight, K. Sakurai, D.J. Lohse, D.N. Schulz, J.A. Sissano, W. Wedler, H. H. Winter Dec 1995

Dynamic Viscoelastic Properties Of Poly(Ethylene-Propylene) Diblock Copolymer In The Melt State And Solutions, William Macknight, K. Sakurai, D.J. Lohse, D.N. Schulz, J.A. Sissano, W. Wedler, H. H. Winter

William MacKnight

No abstract provided.


Structure And Properties Of Polyelectrolyte-Surfactant Nonstoichiometric Complexes In Low-Polarity Solvents, William Macknight, Kirill N. Bakeev, Yang M. Shu, Alexander B. Zezin, Viktor A. Kabanov, Andrey V. Lezov, Alexander B. Mel'nikov, Igor P. Kolomiets, Evgenii I. Rjumtsev Dec 1995

Structure And Properties Of Polyelectrolyte-Surfactant Nonstoichiometric Complexes In Low-Polarity Solvents, William Macknight, Kirill N. Bakeev, Yang M. Shu, Alexander B. Zezin, Viktor A. Kabanov, Andrey V. Lezov, Alexander B. Mel'nikov, Igor P. Kolomiets, Evgenii I. Rjumtsev

William MacKnight

No abstract provided.


Ionomeric Blends Of Poly(Ethyl Acrylate-Co-4-Vinylpyridine) With Zinc-Neutralized Sulfonated Poly(Ethylene Terephthalate). 3. Effects Of Functionalization Level, William Macknight, C. W. Alice Ng Dec 1995

Ionomeric Blends Of Poly(Ethyl Acrylate-Co-4-Vinylpyridine) With Zinc-Neutralized Sulfonated Poly(Ethylene Terephthalate). 3. Effects Of Functionalization Level, William Macknight, C. W. Alice Ng

William MacKnight

No abstract provided.


Self-Assembled Complexes Of Synthetic Polypeptides And Oppositely Charged Low Molecular Weight Surfactants. Solid-State Properties, William Macknight, Ekaterina A. Ponomarenko, Alan J. Waddon, Kirill N. Bakeev, David A. Tirrell Dec 1995

Self-Assembled Complexes Of Synthetic Polypeptides And Oppositely Charged Low Molecular Weight Surfactants. Solid-State Properties, William Macknight, Ekaterina A. Ponomarenko, Alan J. Waddon, Kirill N. Bakeev, David A. Tirrell

William MacKnight

Solid-state properties of the stoichiometric complexes formed by sodium poly(a,L-glutamate)
and oppositely charged low molecular weight surfactants (alkyltrimethylammonium bromides) were
examined by circular dichroism, infrared, and X-ray diffraction techniques. The polypeptide chains in
the complexes were shown to be predominantly in the a-helical conformation at room temperature. At
higher temperatures, weakening or disruption of intramolecular hydrogen bonds stabilizing the a-helical
conformation was observed. The polypeptide-surfactant complexes were shown to adopt lamellar
structures in the temperature range 20-150 °C. The lamellae consist of alternating layers of
polyglutamate chains and bimolecular layers of surfactant, with the surfactant alkyl chains aligned
perpendicular to …


Ionomeric Blends Of Poly(Ethyl Acrylate-Co-4-Vinylpyridine) With Metal-Neutralized Sulfonated Poly(Ethylene Terephthalate). 4. Effects Of Counterions, William Macknight Dec 1995

Ionomeric Blends Of Poly(Ethyl Acrylate-Co-4-Vinylpyridine) With Metal-Neutralized Sulfonated Poly(Ethylene Terephthalate). 4. Effects Of Counterions, William Macknight

William MacKnight

No abstract provided.


Blends Of Amorphous-Crystalline Block Copolymers With Amorphous Homopolymers. Morphological Studies By Electron Microscopy And Small Angle Scattering, William Macknight, Kazuo Sakurai, David J. Lohse, Donald N. Schulz, J.A. Sissano, Jar-Shyoung Lin, Mikhail Agamalyan Dec 1995

Blends Of Amorphous-Crystalline Block Copolymers With Amorphous Homopolymers. Morphological Studies By Electron Microscopy And Small Angle Scattering, William Macknight, Kazuo Sakurai, David J. Lohse, Donald N. Schulz, J.A. Sissano, Jar-Shyoung Lin, Mikhail Agamalyan

William MacKnight

A morphological study was performed with symmetric diblock ethylene-propylene copolymer (DEP) and
the binary blends made from DEP and atactic polypropylene (APP) by use of small angle X-ray, light
and neutron scattering, and also scanning and transmission electron microscopy. DEP contains
a crystallizable polyethylene block and an amorphous atactic polypropylene block. Quenching the blends
in liquid nitrogen preserved the morphology in the melt state. This quenching technique revealed that DEP
forms a lamellar microdomain structure and blending DEP and APP includes morphological changes in the
microdomain structures as well as macrophase separation. When the APP chain was shorter than the …


The Performance Of Unifac And Related Group Contribution Models Part Ii. Prediction Of Henry's Law Constants, Yasar Demirel Dec 1995

The Performance Of Unifac And Related Group Contribution Models Part Ii. Prediction Of Henry's Law Constants, Yasar Demirel

YASAR DEMIREL

Henry's law constants for 24 different systems have been determined using UNIFAC and related group contribution models. The results obtained from original, modified and free-volume effect UNIFAC models are compared with experimental results. Empirical relationships for the temperature-dependency of Henry's constant for the chloroform(l) water(2) system are also determined.


Epitaxial Interactions Between Molecular Overlayers And Ordered Substrates, Andrew C. Hillier, Michael D. Ward Dec 1995

Epitaxial Interactions Between Molecular Overlayers And Ordered Substrates, Andrew C. Hillier, Michael D. Ward

Andrew C. Hillier

A framework for evaluating the epitaxy of crystalline organic overlayers of generic symmetry on ordered substrates is described, which combines a computationally efficient analytical method for explicit determination of the type of epitaxy ~i.e., commensurism, coincidence, or incommensurism! and overlayer azimuthal orientation with an analysis of the elastic properties of the overlayer and the overlayer-substrate interface. The azimuthal orientations predicted by the analytical method agree with values predicted by semiempirical potential-energy calculations and observed experimentally for previously reported organic overlayers which are demonstrated here to be coincident. Calculations based on this analytical approach are much less computationally intensive than potential-energy …


The Performance Of Unifac And Related Group Contribution Modelspart I. Prediction Of Infinite Dilution Activity Coefficients, Yasar Demirel Dec 1995

The Performance Of Unifac And Related Group Contribution Modelspart I. Prediction Of Infinite Dilution Activity Coefficients, Yasar Demirel

YASAR DEMIREL

Infinite dilution activity coefficients have been calculated for 24 systems including highly non-ideal and nearly non-ideal using original, modified UNIFAC and UNIFAC-FV models. The calculations are compared with experimental results. The performance of the models in predictions and the significance of free volume effects on solvent activities in solutions containing small compounds are discussed.


Heat Transfer Through A Low-Pressure Gas Enclosure As A Thermal Insulator: Design Considerations, Yasar Demirel Dec 1995

Heat Transfer Through A Low-Pressure Gas Enclosure As A Thermal Insulator: Design Considerations, Yasar Demirel

YASAR DEMIREL

Heat transfer through gases at low pressures, rarefied media, plays a very significant role in the design of solar receivers and low-temperature cooling equipment. It is shown here that low-pressure and transition regimes of heat transfer prevail in such applications. State-of-the-art procedures for estimating these heat-transfer rates are presented together with an improved expression for the thermal accommodation coefficient for monatomic gases on engineering surfaces. The latter are characterized with values of thermal accommodation and reflection coefficients. Numerical calculations relevant to design engineers interested in these industrial applications are presented and the same are discussed for the dependencies of the …