Materials Literature
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The effects of plasma treatment of pyromellitic dianhydride-4,4'-oxydianiline polyimide (PMDA-ODA PI) on the adhesion strength of novolac epoxy resin/PMDA-ODA PI joints were studied. The adhesion strength of novolac epoxy resin/PMDA-ODA PI joints increased by plasma treatment of PMDA-ODA PI. Oxygen and argon plasmas w…
Through in-situ TEM observation on an Fe-30.3 mass%Mn-6.1 mass%Si shape memory alloy under extending at room temperature, it is found that on a lower applied stress level, the ε-martensite plates are preferentially formed at interfaces of pre-existing overlapped stacking faults or ε-martensites with γ-phase especially…
SummaryElectrodeposition of Zn-Mn (0÷50 w/o) onto carbon steel sheet and wire is discussed in the present paper. An original bath is proposed and effects of stabilisers are studied. Baths and deposits are studied from the electrochemical and structural points of view. Electrochemical investigations include galvanostat…
Surface charge distributions of disk type aluminas held between a backside electrode (alumina holder) and a needle electrode to be excited by an impulse voltage (rise time 64 /spl mu/s, wave tail 700 /spl mu/s) were measured. The measurement of surface charge distribution on the whole surface area of alumina YSA998 an…
Photoinduced electron transfer reactions have been observed with transient absorption spectroscopy from zeolite framework to a few guest aromatic molecules with strong electron accepting nature represented by 1,2,4,5-tetracyanobenzene (TCNB): photoexcitation of the guest molecules adsorbed in cavities of faujasite zeo…
We consider the ordering of molecular dipoles at a nematic surface and the influence of this ordering on the equilibrium director orientation and the anchoring energy. Both phenomenological and molecular approaches are used. We show that a thin, spontaneously polarized layer will appear even at a structureless nematic…
In a previous study we have explored how the wettability of a spherical solid particle resting in a fluid/fluid interface can be influenced by effects of line tension (τ) acting in the circular three-phase contact line around the particle. Here, we extend that study to consider possible effects of line tension on a sm…
The vapour-phase catalytic oxidation of benzyl alcohol has been carried out over NaZSM-5 supported copper and alkali-metal-added NaZSM-5 supported Cu catalysts. The NaZSM-5 zeolite supported copper catalyst has been prepared by three different methods, impregnation (Cu imp1 /NaZSM-5), modified impregnation (Cu imp2 /N…
The main structure of shark type I collagen is similar to that of land mammals, with a partial difference in amino acid sequence and post-translational modification. By static light scattering, the weight-average molecular weight of shark collagen (7.52 x 10(5)) suggests the presence of some aggregated molecules, olig…
SummaryThe development of a reliable production process for the electroless nickel plating of magnesium die casting alloy is described. The chemistries of the pre-treatment process and the electroless nickel solution itself are interdependent. SEM, EDX and EPS studies were made of the magnesium surface at various stag…
Thermal infrared detectors require thermal isolation to permit the infrared-sensitive material to integrate the incident photon energy and thereby obtain high responsivity and detectivity. This paper describes the fabrication of semiconducting YBaCuO microbolometer arrays into thermal isolation structures by employing…
This paper reports an investigation of the functionalisation of polypropylene with polar monomers as an interfacial stabiliser for mixtures of poly-olefins with polyesters. Polypropylene was functionalised with maleic anhydride and acrylic acid in the presence of dicumyl peroxide. The reaction was carried out in the m…
A new synthetic approach to tetrathiafulvalene (TTF) dendrimers is reported. Tetrakis(4-chloromethylbenzylthio)tetrathiafulvalene7 is a functionalised core unit which reacts with four equivalents of the thiolate ion generated from compound 16 to afford the trisdeca-TTF derivative 3. Compound 3 is a shelf-stable solid…
Lamellar single crystals of poly(ethylene terephthalate) (PET) have been prepared by our confined thin film melt polymerization method between glass at polymerization temperatures of 150° to 225°C. (010) twinned crystals are frequently observed among these lamellae, especially for those prepared at higher temperatures…
We present the results of a study of photoinduced anisotropy in a model chalcogenide glass ${\mathrm{As}}_{2}$ ${\mathrm{S}}_{3}$ in a wide spectral range using reflectance-difference spectroscopy. We have found that the anisotropy is induced at energies much exceeding the energy of the inducing photons and that the s…
Equilibration of aromatic poly(ether sulfone)s and poly(ether ketone)s under conditions of fluoride-catalysed ether exchange leads, at low polymer concentrations in dipolar aprotic solvents, to efficient ring-closing depolymerisation.
(1997). A Thermodynamic Analysis of the Contribution of Hydroxyproline to the Structural Stability of the Collagen Triple Helix. Connective Tissue Research: Vol. 36, No. 4, pp. 347-365.
A novel, anionic route to well-defined side-chain liquid-crystalline polysiloxanes is described. The usual cationic approach to these polymers leads to polydisperse materials with uncontrolled microstructures. Ring-opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly(dimethylsiloxane- co -methylvi…
The composition of the europium–thenoyltrifluoroacetone (TTA)–trioctylphosphine (TOPO) chelate in water in the presence of Triton X-100 was investigated. The stoichiometric composition was found to be Eu(TTA) 3 (TOPO) 2 , but different compositions can occur depending on the relative concentrations of the ligands. The…
Carbon nitride solids, predicted to exhibit bulk moduli comparable with or exceeding that of diamond, are reviewed for both theoretical and experimental developments. Progress in the theory and preparation of these solids is described detailing the structure, composition, thermodynamic aspects, and physical and mechan…