Materials Literature
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Dynamic light scattering measurements have been performed on four symmetric diblock copolymer melts, as a function of temperature, both above and below the order−disorder transition (ODT). The materials were poly(ethylenepropylene)−poly(ethylethylene) (PEP−PEE) with M w = 5.0 × 10 4, poly(vinylcyclohexane) (PVCH)−PEE…
Quadrupole echo deuterium NMR has been used to probe the dynamics of poly(vinyl acetate- d 3 ) in bulk and at saturation coverage (from toluene) on silica at the solid−air interface. In bulk and at lower temperatures, the deuterium powder pattern of the labeled methyl group was found to be consistent with fast threefo…
The disordered and ordered states of a PEP−PEE diblock copolymer have been studied at different temperatures and pressures by small-angle neutron scattering, with the main goal to determine the relation between hydrodynamic pressure and the Flory−Huggins interaction parameter of a diblock copolymer melt. The structure…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMorphology and Macroscopic Properties of Conducting Polymer BlendsMark A. Knackstedt and A. P. RobertsView Author Information Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian Nation…
The relationship between chemical structure and ion transport in silver-for-sodium ion exchange in the endpoints of a series of sodium aluminosilicate glasses is examined. It is shown that the non-bridging oxygen (NBO) content of the glass has a major impact on both the local environments of the mobile cations and the…
The structure of polyamide 46/polyamide 6I copolymers obtained by reaction in the molten state is analyzed as a function of the extrusion time, the extrusion temperature, and the overall blend composition by 13 C NMR. The degree of transamidation, the degree of randomness, and the number-average block length of the co…
The presence of submonolayer amounts of underpotentially deposited copper induces the adsorption of sulfate/bisulfate on Pt stepped surfaces. The surfaces studied include the (111) and (110) surfaces and the stepped surfaces of (10,10,9), (554), (332), (221) and (331), which correspond to (111) terrace widths of 19, 9…
The b~omarker concept lnvolves the use of biochemical, cellular and phys~ological parameters a s screening tools In environmental surveillance Stress protelns, such as heat shock protelns (HSPs), fulflll many of the requirements for belng Ideal candidates In a b ~o m a r k e r strategy for envlronmental monitonny Spon…
The biomedical study of NiTi shape memory alloys has been undertaken in China since 1978. A series of stimulating corrosion tests, histological observations, toxicity tests, carcinogenicity tests, trace nickel elements analysis and a number of clinical trials have been conducted. The results showed that the NiTi shape…
2.2.2-Cryptand(1+) salts of the [Sb(2)Se(4)](2)(-), [As(2)S(4)](2)(-), [As(10)S(3)](2)(-), and [As(4)Se(6)](2)(-) anions have been synthesized from the reduction of binary chalcogenide compounds by K in NH(3)(l) in the presence of the alkali-metal-encapsulating ligand 2.2.2-cryptand (4,7,13,16,21,24-hexaoxa-1,10-diaza…
The effect of Zn water chemistry additions on the mechanism of intergranular stress corrosion cracking (IGSCC) of Fe-based alloys in water at 288°C was evaluated in terms of the slip-dissolution model. In this model, an increase in the oxide film rupture strain or surface film repassivation kinetics improved resistanc…
J. M. Thomas, Faraday Discuss., 1996, 105, 1 DOI: 10.1039/FD9960500001
We have examined the effect of the substrate in cubic boron nitride (c-BN) film synthesis by depositing BN films on a variety of materials using ion-assisted pulsed laser deposition. Using optical modeling, we estimated the c-BN content of the films from the measured infrared reflectance spectra. We find less c-BN in…
The electrodeposition and properties of poly(1,8-diaminonaphthalene) films on Au electrodes have been studied using electrochemical quartz crystal microbalance and crystal impedance measurements. Redox switching of films exposed to aqueous 0.1 mol dm–3 HClO4 is accompanied by non-monotonic mass changes: proton, counte…
The combustion of methane with an excess of oxygen was examined under transient conditions in a catalytic monolith reactor. The reaction exhibited a sharp light off in the inlet region of the reactor, and essentially complete combustion was attained. The experimental reactor was modeled using a comprehensive two-dimen…
An artificial contamination method for hydrophobic polymer insulators has been developed which can provide a uniform contaminant layer, similar to that found in nature, without either damaging the polymer surface or by adding any chemical agent to the conventional contamination slurry. Using this method, the basic con…
The self-consistent-field model for polymer adsorption of Scheutjens and Fleer is extended to the case of semiflexible chains in a cubic lattice. It is found that the scaling behavior for adsorption from a dilute solution of polymers with the same radius of gyration, but with a varying degree of stiffness, is markedly…
We examine prospects for metastability of six-coordinate high-pressure semiconductor phases at ambient temperature and pressure (STP). We investigate a simple “thermodynamic”, coherent transformation model for nanocrystals of size >2 nm and, as a quantitative example, apply it to the silicon β-tin to diamond structura…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThermodynamically Controlled Morphological Disorder in a Microphase-Separated Cylindrical Block CopolymerKarsten Jung, Volker Abetz, and Reimund StadlerView Author Information Institut für Organische Chemie, Johannes Gutenberg Unive…
The fracture toughness G c of epoxy/high-impact polystyrene (HIPS) interfaces was measured as a function of grafting chain density Σ of carboxylic acid terminated deuterated polystyrene (dPS-COOH) chains of various degrees of polymerization N . The dPS chains penetrate into the bulk HIPS whereas the −COOH end function…