Materials Literature
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Competitive particle growth (CPG) theory and linear stability analysis are combined to study the potential patterning trends of two-salt Liesegang systems. The pattern formation is treated as a post-nucleation phenomenon. Experimental investigations show that some systems mainly give patterns where the bands of the tw…
The Rietveld method, extended by a Fourier analysis of line profiles on the basis of the Warren–Averbach method, has been used for analysing the powder X-ray diffraction (PXRD) pattern of a [Zn–Al–Cl] layered double hydroxide, in order to separate size and strain effects. Assuming a given size distribution (Cauchy) an…
The incorporation of poly(1,4-butylene adipate) (PBA) and its crystallization behavior within poly(vinylidenefluoride) (PVF2) spherulites in miscible PVF2/PBA blends have been further studied with small-angle X-ray synchrotron scattering (SAXS). The incorporation of PBA into the PVF2 interlamellar region was found to…
The surface modification of poly(ethylene terephthalate) (PET) and UV-cured tripropyleneglycol diacrylate (acrylic) films induced by remote N2 and Ar microwave plasmas (2.45 GHz) was compared by in-situ XPS measurements. Both N2 and Ar plasma treatments led to destruction of the initial oxygen-containing groups. The d…
The crystalline structure and physico-mechanical properties of polypropylene (PP) blended with ethylene–propylene copolymer (EPM) were investigated. WAXS diffractograms showed that the addition of EPM did not affect the crystalline structure of PP. DSC curves revealed the presence of two Tg peaks indicating the amorph…
The Nagel-scaling and the modified scaling procedure proposed recently by Dendzik et al. have been applied to broadband dielectric data on two glass- forming liquids (glycerol and propylene carbonate) and three plastic crystals (ortho-carborane, meta-carborane, and 1-cyano-adamantane). Our data extend the upper limit…
CURRENT SCIENCE, VOL. 79, NO. 7, 10 OCTOBER 2000 1007 6. Seeber, L. and Gornitz, V., Tectonophysics , 1983, 92 , 335 –367 . 7. Jackson, M. and Bilham R., J. Geophys. Res. 1994, 99 , 13897–13912. 8. Bilham, et al., Nature , 1998, 386 , 61 –64. 9. Chugh, R. S., in International Symposium on Recent Crustal Movements, 197…
The crosslinking processes of aqueous poly(vinyl alcohol) (PVA) by γ-ray irradiation were studied by viscometry, dynamic and static light scattering (DLS and SLS), as well as size exclusion chromatography (SEC). Increases in the intrinsic viscosity ([η]), molecular weight (Mw), hydrodynamic radius (Rh), and radius of…
Bisdipyrrin 1 reacts with Ru3(CO)12 to yield the pentanuclear cluster 2; the X-ray structure of 2 sheds new light on the metalation processes of oligopyrrolic ligands.
We have previously shown with X‐ray photoelectron spectroscopy that acetone remaining on the surface of a copper strip after degreasing, can react slowly with water vapor under ambient light to form acetic acid and cause severe corrosion. The reaction was completely inhibited in darkness. This suggested that copper re…
Field studies have been performed in residential areas to determine the load restoration process after a disturbance. Similar measurements were also performed for individual houses with different heating supplies. Load aggregation for the different houses during the same outdoor conditions have been made for various d…
The first observation of ordered microphase structures in poly(oxyethylene)–poly(oxypropylene) diblock copolymers melts is reported. Two diblock copolymers were synthesised by anionic polymerisation, i.e. E130P58 and E107P69 where E represents an oxyethylene unit, OCH2CH2, and P an oxypropylene unit, OCH2CH(CH3). The…
The analysis of the formation mechanisms for freckling and for random gram formation in single crystal castings has resulted in a general understanding of the principles involved, but has not been tested extensively against results in actual superalloy castings. In this work, we present the results of experimental wor…
Metallic Mo powder and Ti(OBun)4 were separately dissolved in H2O2 solution and the solutions obtained mixed in different Mo/Ti atomic ratios to prepare precursor solutions. Fresh gels obtained from the precursor solutions with > 40% Mo became blue upon exposure to ambient light. X-Ray photoelectron spectroscopy (XPS)…
In this paper the different reactivities of the di- and polysulfane chains of the silanes TESPD and Si 69 in model systems and under various reaction conditions, similar to those during rubber processing, are described. Due to the different reactivities the polysulfanes of Si 69 limit the upper processing temperature…
The deposition of ternary materials such as Cd1 − xZxnS by chemical bath methods is a problem due to differing hydrolytic stabilities of the two metals. A novel approach to the deposition of this material has been developed in which moderately acidic baths are used.
Neutral π-radicals of three lithium porphyrins (tetraphenylporphyrin [Li(TPP)·], 1, tetra(pentafluorophenyl)porphyrin [Li(PFP)·], 2, and tetra(3,5-bis-tert-butylphenyl)porphyrin [Li(TBP)·], 3) have been prepared and characterized using UV-vis, EPR, and IR spectroscopy, and, in the case of 1, X-ray crystallography.
The chemical vapor deposition of pyrolytic boron nitride from borazine (the B3N3H6–N2 system) in the temperature range of 1300–1800 °C and chamber pressures of 1–10 Torr has been studied using a cold-wall reactor. The density, phase composition and B/N ratio of the samples (0.2–0.8 mm thick) have been measured. The de…
The relationship between the polymer–solvent interaction and gelation behavior of poly(vinyl alcohol) (PVA) solutions prepared from ethylene glycol/water (EG/water) mixed solvents was investigated using a viscometer, light scattering, FTIR, X-ray, and pulsed NMR analyses. The viscometric result showed that the affinit…
The styrene–EPDM–vinylacetate (SEV) graft polymer, which linked respectively the styrene (St) unit and vinylacetate the (VAc) unit to the ethylene–propylene–diene terpolymer (EPDM) backbone was synthesized by two-step graft polymerizations: First the graft polymerization of VAc onto EPDM was carried out, and then St w…