Materials Literature
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Abstract The Izod impact strength of poly(vinyl chloride)/methyl methacrylate/butadiene/styrene(PVC/MBS)polymer blends can be changed significantly with different levels of MBS and/or MBS particle size. The following results were obtained by investigating the fracture of PVC/MBS test specimens: (1) The dependence of t…
The solubility of carbon in liquid silicon equilibrated with silicon carbide was determined in the temperature range from 1723 to 1873 K. Silicon was melted in a silicon carbide crucible with an Ar-CO mixture gas flowing. Carbon in silicon was analyzed by the combustion-IR absorption method. The temperature dependence…
Eight different conducting polymer films formed from pyrrole and N-substituted pyrrole derivatives were characterized by cyclic voltammetry, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy. In particular, the XPS of poly[N-butylpyrrole], poly[N-(2-carboxyethyl)pyrrole], poly[N-(6-hydroxyhexyl)p…
Three new one-dimensional µ-nitrito nickel(II) complexes of formula [{NiL 1 (µ-NO 2 )} n ] [ClO 4 ] n 1, [{NiL 2 (µ-NO 2 )} n ] [ClO 4 ] n 2 and [{NiL 3 (µ-NO 2 )} n ] [ClO 4 ] n 3 have been synthesized and characterized [L 1 = N,N′-bis(2-amino ethyl)propane-1,3-diamine, L 2 = N,N′-bis(3-aminop ropyl)ethane-1,2-diamin…
Adsorption isotherms taken at temperatures ranging from 20 to 77 K show a large pore volume and surface area of 980 m2 g -1 for the physical adsorption of molecular hydrogen on MCM-41. The adsorbed hydrogen behaves more like a solid than a liquid and isosteric heats of adsorption reveal a heterogenous surface. The eva…
Reaction of [Mo 6 O 19 ] 2- with an excess of 2,6-diisopropylphenyl isocyanate (ArNCO) affords the title anion in which the hexamolybdate framework serves as an octahedral nexus for six terminal arylimido ligands.
A homogeneous and stoichiometric Pb(Zr 1-x Ti x )O 3 (x=0.52; PZT) powder with a particle size of 20–40 nm has been prepared by the citrate route. Solubility isotherms have been calculated for metal–citric acid–water systems at 25 °C to predict the optimum pH condition, which was found to be pH=6.5 for preparing pure…
This report describes electrical properties such as space charge distribution, water treeing characteristics and ac breakdown strength in PE (polyethylene) modified by grafting and blending techniques. A control PE shows heterocharge. In AA (acrylic acid)-grafted PE (LDPE-g-AA), the heterocharge observed in PE decreas…
The reaction of [(C 6 H 11 ) 7 Si 7 O 9 (OH) 3 ] 1 (2 equiv.) with [(C 6 H 11 ) 7 Si 7 O 9 (OTl ) 3 ] 3 affords a conproportionation product that reacts with [PPh 4 ]Cl, [PBu n 4 ]Cl and [NBu n 4 ]Br to produce the corresponding salts of [(C 6 H 11 ) 7 Si 7 O 10 (OH ) 2 ] - 5 (i.e. the monoanion derived from deprotona…
Sn-β and Al-free Sn-β (large pore, 12-membered ring channels) molecular sieves prepared by hydrothermal synthesis and characterised by XRD, FTIR and sorption techniques are distinguished by their acidic and oxidation properties, in the acetylation of 1,3,5-trimethylbenzene (1,3,5-TMB) with acetyl chloride and in the o…
Three different molecular weight versions of the phenylethynyl-terminated polyimide LARC™-PETI-5 were synthesized. The materials synthesized had theoretical number average molecular weights of 2500, 5000, and 10000 g mol. Differential Scanning Calorimetry (DSC) was performed on the dry powder form of these materials t…
Neutron Laue data collection, which harnesses a broader wavelength band emitted from the neutron source, opens up the prospect of studying larger proteins and/or using smaller protein crystals than is possible with monochromatic neutron protein crystallography data collection methods. Concanavalin A, a 25 kDa† protein…
Abstract Single crystals of Bis(thiourea) cadmium chloride (BTCC), and Tris(thiourea) zinc sulphate (TZnS) have been grown from saturated aqueous solution by slow evaporation method at room temperature. The laser Raman and FT‐IR spectra on these crystals are recorded in the frequency range 50–4000 cm −1 . The spectral…
A new approach to the synthesis of azulene liquid crystals is described based on Hafner’s procedure involving reaction of a pyridinium salt with a cyclopentadienide. The preparation of a variety of liquid crystalline materials using this method is described. Variants are reported with single substituents on the azulen…
This chapter discusses some important features of chemically synthesized semiconductor heterostructures. By controlling the methods of preparation it is possible to tailor the photocatalytic property of these composite semiconductor nanoclusters. Their ability to carry out redox processes, with greater efficiency and…
Magnesium silicon nitride (MgSiN2) was synthesized by the nitridation of powders in the magnesium (Mg)-silicon (Si) system. Although an Mg and Si powder with an Mg/Si ratio of 1.0 (=stoichiometric ratio of MgSiN2) was heated up to 1400°C in nitrogen (N2), a single phase of MgSiN2 could not be obtained, due to evaporat…
A non-destructive method based on the use of Raman spectroscopy (RS) for the determination of the percentage of gypsum in sulfated marble is presented. The Raman spectra of well mixed powder samples of calcite–aragonite, calcite–gypsum and gypsum–aragonite pairs of mixtures were recorded and the characteristic bands a…
Abstract Preparation, morphology, and mechanical properties were studied of blends of a thermotropic liquid crystalline polymer (TLCP) with two different grades of polypropylene, one with and one without overlap in processing temperatures, using two different blending methods. The highly viscous grade (PP‐1) was of su…
By studying the electro-optical properties and the textures of the subphases successively emerging between antiferroelectric SC A * and ferroelectric SC* (the Devil’s staircase), we have revealed several interface effects in both homogeneous and homeotropic cells; free-standing films are most suitable for making obser…
A study of the Na 0.5 Bi 0.5 TiO 3 –PbTiO 3 and K 0.5 Bi 0.5 TiO 3 -PbTiO 3 systems has been carried out using X-ray diffraction, differential scanning calorimetry and dielectric measurements. The limits of the rhombohedral (Na 0.5 Bi 0.5 TiO 3 -rich side) and tetragonal (PbTiO 3 -rich side) solid solutions have been…