Materials Literature
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Thin Ni layers were deposited onto clean polymethyl methacrylate (PMMA) and poly(styrene-co-acrylonitrile) (SAN) surfaces by a high vacuum thermal evaporation process. The resulting interfaces were studied by X-ray photoelectron spectroscopy. The Ni deposition on PMMA changes the relative intensity of the C1s spectra…
A unified picture of icosahedral cluster solids obtained by comparing Al-based icosahedral quasicrystals to boron-based cluster solids, which consist of icosahedral clusters of the same group III element, B, is discussed. Metallic-covalent bonding conversion in icosahedral clusters of Al and B was demonstrated by mole…
Reactor produced blends of polypropylene (PP) and polystyrene (PS) are obtained by graft copolymerization of styrene onto polypropylene chains. This technique generates simultaneously a graft copolymer (PP-g-PS) and polystyrene homopolymer. The resulting blends, however, have a low impact resistance and have to be mod…
γ ‐ MnO 2 compounds are usually prepared by oxidative electrodeposition at high constant current density from boiling MnSO 4 solutions. Their structure is made of an intergrowth of ramsdellite and pyrolusite blocks (with a percentage Pr (of rotile) of 40–50%) and of microtwinning (Mt) defects (with a percentage Mt > 4…
Radiation effects on zeolite-NaY have been investigated by irradiation with a 500 keV H+ beam. Zeolite-NaY suffers structural damage under proton irradiation. The crystalline-to-amorphous transition occurs at a total dose equivalent to an ionizing energy deposition of 3 × 1010 Gy and a displacement dose of 0.05 dpa (d…
Sn–Pb alloy-loaded polystyrene (PS) composites were processed by powder mixing and hot pressing. For the composites hot-pressed at the temperatures below the melting point of the alloy, the resistivity dropped sharply if the alloy volume fraction reached 20 vol %. When the composites were processed at temperatures abo…
Tesselation of new porphyrin-based network motifs was demonstrated in crystals by incorporation of the diaminotriazine functions in the molecular building blocks. The title compound was synthesized and successfully applied in the construction of a uniquely structured solid which consists of flat multiporphyrin network…
Conducting layers on KrF excimer-laser-irradiated polyimide film surfaces were investigated by XPS, SEM and Fourier transform infrared (FTIR)– Raman spectroscopy. Analysis of polyimide residue after laser irradiation provided valuable insight into the nature of the formation of conducting layers. The subtle different…
The use of solution activators (dissolved metal salts) to enhance aluminum electrochemical activity in organic media is reported. Aluminum is electrochemically passive in most organic electrolytes and unlike lithium, has not been developed as a battery anode in organic media. We demonstrate significant Al activity in…
Thermotropic ionic nematics with moderate transition temperatures are obtained by dissolving alkali metal salts within nematogens bearing a crown ether moiety; in these media, the ions show a significant ‘apparent ionic order’ as measured by quadrupolar NMR spectroscopy.
The antimicrobial activity of chitosan with different molecular weight was studied. E.colii and St.aureus were used as experimental microbial. The effects of the concentration and molecular weight of chitosan were tested respectively and the antimicrobial mechanism was proposed. It was found that for the chitosan with…
Urea-formaldehyde (UF), polymerized in situ in aqueous media, is a rigid polymer that can be used in the controlled release of bioactive molecules. During the process of polymerization, liquid neem seed oil (NSO) was encapsulated at three different loadings, which was then replaced by diclofenac sodium (DS), the prese…
Characterizing the morphology of modified multiphasic polymer systems, as are often applied for improving the impact strength, is normally a complicated and tedious task. Nevertheless, knowledge about the volume fraction and particle-size distribution of the elastomer phase is important for the specific development of…
Formulas for the wave aberrations introduced into a beam by a prism or a plane grating are derived from the theory of plane symmetric systems. Emphasis is made on the field-dependent aberrations.
Interactions between macrofouling and corrosion have been studied on two duplex stainless steels (UNS S31803 and UNS S32760), an austenitic stainless steel (UNS S31354), a nickel base alloy (UNS N06625), and a cobalt base alloy (UNS R30006) in long term tests conducted in natural sea water off the west coast of Scotla…
Changes in the dynamic response of glass-reinforced phenolic composites following thermal exposure at 180oC for periods of time up to 28 days were monitored using dynamic mechanical analysis. Four phenolic resins were investigated: a resol/novolac blend, a phenolic–furan novolac/resol graft copolymer, a novolac, and a…
Abstract Polyglycols are used in a wide range of applications, including lubrication. Many advantageous properties can be obtained for lubricant applications by manipulating the four variables in polyglycol preparation: the initiator, the alkylene oxides, the molecular build‐up, and the mole weight. However, it has lo…
Phenanthro[b]phenazine, a new heterocyclic ring structure of both biological and physical interests, has been prepared by coupling 1, 2-phenylenediamine with triphenylene-2, 3-quinone derivative. The first derivative of this novel core, 2,3,6,7-tetrapentyloxyphenanthro[b]phenazine, shows a monotropic columnar phase.
We investigated the solid-solution (1 − x)Pb(Zn1/3Nb2/3)O3–xPbTiO3 relaxors by means of Raman spectroscopy. A detailed temperature-dependent study in the range 70–580 K was carried out on (1 − x)PZN–xPT relaxors with compositions x = 0.02 and 0.05 using Raman scattering under different optical and electric field varia…
The relationship between the rheological properties and composition of eight thermoplastic polyurethane elastomers (TPUEs) was evaluated using a stress-controlled rheometer. The composition of the TPUEs was changed by varying the OH/NCO ratio, the chain extender and the molecular weight of the macroglycol used in the…