Materials Literature
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Mechanical, combustible and smoke properties of two series of high impact polystyrene (PS-HI) compositions differing in the content of flame retardant [Mg(OH)2] and amount of a modifier (SBS) mentioned in the title (Table 1). In the first series of experiments [50 wt. % of Mg(OH)2] it has been found that modification…
The mechanical properties of PVC sheets can be modified substantially by both uniaxial and biaxial stretching of the material above its glass transition temperature. Previous experimental studies have established a clear pattern in the relationship between tensile properties of oriented PVC products and imposed strain…
The development of new emulsion resins (also known as dispersion or paste resins) continues despite dramatic changes in the applications sector for these types of resins. Suppliers of such resins still find the need to innovate constantly in order to maintain a market position and to both lead and follow the technical…
In the present work, the galvanic corrosion of candidate disposal container material pairs of Cu-Ni 90-10/TStE355 carbon steel (CS) and Cu-Ni 70-30/TStE355 steel (contact specimens), respectively, has been investigated in two disposal-relevant salt brines at 150°C, both without gamma irradiation and in the presence of…
Resistivity is observed quantitatively in a thin electroplated copper layer. A resistivity of 2.6 µΩ·cm is observed in a 600-nm-thick as-deposited copper layer by conventional electroplating. This resistivity increases rapidly with decreasing thickness and reaches 7.8 µΩ·cm at a thickness of 75 nm. This rapid increase…
Abstract The viscosity during the earlier stages of the gelation process of plastisols formulated with 15 different commercial plasticizers has been obtained. Plastisols prepared were rotomoulded and mouldings obtained were characterized according to their wall thickness distribution. This parameter strongly depends o…
Abstract Colloidal gold nanoparticles self-assembled into macroscopic aggregates by a charge-transfer interaction between a 9-carbazolyl unit as an electron-donor immobilized on the surface of the gold nanoparticles and a bivalent linker containing two dinitrophenyl units as electron-acceptors. Transmission electron m…
Abstract Carbamoylation of cellulose esters (CE) and investigation of the mixed derivatives obtained with NMR spectroscopy represents a useful analytical tool for the determination of the degree of substitution (DS) and analysis of the distribution of substituents on the level of the anhydroglucose unit (AGU). Especia…
This work reports the synthesis of two different polyamidoamines (PAAs), by the reaction of piperazine (Pip) and cyclohexylamine (CHA) with N,N′‐methylene bis acrylamide (MBA), which subsequently copolymerized with vinyl acetate (VAC) to improve the mechanical properties of the materials. The materials were characteri…
The crystallographic and magnetic properties of a series of substitutions in nickel ferrite where the Fe³+ is replaced with In³+ have been investigated using X-ray diffraction (XRD) and Mossbauer spectroscopy. Information on the exact crystalline structure, lattice parameters, bond lengths and bond angles were obtaine…
Abstract. Sulfur (S) solubility is determined in silicate melts, in particular with low-FeO content coexisting with graphite. In a high FeO range (>10 mol %), the S solubility is strongly dependent on the FeO content in silicate melt, which is in good agreement with previous works. In an intermediate FeO range (1∼10 m…
We prepared poly(6-[4-(4'-cyanophenyl)phenoxy]hexyl acrylate)s with various molecular weights ( M n ) and narrow molecular weight distributions, and examined the M n dependence of phase behavior which includes the reentrant nematic (RN) phase. Polymers with M n lower than 20,000 form nematic (N), smectic A (SmA) and R…
The equilibrium configuration of liquid crystal molecules in contact with a periodicly patterned substrate has been theoretically analysed considering the variation of the order parameter at the interface, and a first order transition was predicted for a critical periodicity, or induced by temperature or an electric f…
We use the framework of recently formulated kinetic model of temperature-dependent processes accompanying the recording and erasure of diffraction gratings in a polymer matrix doped with azobenzene chrompohores under the illumination with spatially modulated and linearly polarized light to study general features of te…
The Rayleigh-Brillouin light scattering in chalcogenide glasses of the Ge-Sb-S system in the (Sb 2 S 3 ) x (GeS 2 ) 100− x ( x = 0–50) set is investigated. The longitudinal hypersonic velocity, the high-frequency longitudinal elastic modulus, the extinction coefficient at the wavelength λ = 0.6328 μm, and the Landau-P…
Sistemas de materiais nanoestruturados são mais comumente definidos como aqueles que contêm pelo menos uma característica microestrutural com dimensões nanométricas (até 150 nm). O interesse em nanocompósitos de matriz cerâmica está associado à melhoria nas propriedades mecânicas e ao desgaste. Dispersões de pequenas…
The influence of different chemical classes of waxes, used commercially as internal and external lubricants, on the processing behaviour of PVC in profile extrusion is described, drawing on the results of systematic laboratory testing. The present study concentrates on long chain ester waxes, oxidised polyethylene wax…
Abstract Modification of Lyocell dopes with special additives enables the creation of new innovative materials. Additives with functional groups and active surfaces may initiate complex chemical reactions in cellulose/ N ‐methylmorpholine‐ N ‐oxide monohydrate (NMMO) solutions. The effect of carboxylic groups on the t…
It is shown that a spatially localized collective excitation of the atomic sublattice (autosoliton) appears and propagates in a structurally unstable crystal occurring in a pretransition state. The autosoliton, on the one hand, is a structural defect comprising two interphase boundaries separated by the second phase,…
Este trabalho reporta a obtenção de nanopartículas de aluminato de zinco dopado com Eu3+, por meio do método de síntese por reação de combustão. Foram preparadas quatro amostras com diferentes concentrações de dopante, para avaliar o efeito do teor de Eu3+ na luminescência dos pós obtidos. Os resultados de difração de…