Materials Literature
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Abstract The effects of corona‐discharge treatment (CDT) of commercial polyethylene (PE) Linear low‐density PE (LLDPE) were studied with special emphasis on the heat‐seal behavior of treated films. A range of treat levels, representative of those used in industry, was obtained by varying the applied power to a commerc…
Electron beams with an energy of 10 keV were employed for selectively poling only the lower part of a typical nonlinear optical guest/host polymer at a temperature of 90 °C. The resulting dipole orientation was examined by means of electro-optical measurements and thermally stimulated depolarization, while the nonunif…
Abstract The thermal decomposition of three sulfenamide accelerators N ‐cyclohexylbenzothiazole sulfenamide (CBS), 2‐(4‐morpholinothio) benzothiazole (MOR) and 2‐ t ‐butylaminobenzothiazole sulfenamide (TBBS) were investigated by differential scanning calorimetry. The sulfenamides decompose rapidly at 210–220°C, yield…
Abstract Series of polyurethaneurea elastomers were prepared from 4,4′‐diphenylmethane diisocyanate, poly(teuramethylene ether) glycol and poly(hexamethylene carbonate) glycol for mixed soft segments, and 1,4‐butanediol and isophoronediamine for mixed chain extenders. Characteristics of the copolymers related with com…
Abstract The characterization of short chain branching in polyethylene using transmission FTIR spectroscopy is investigated. Traditional methodologies, using the methyl deformation band for qualitative and quantitative analyses, have recognized shortcomings. The methyl and methylene rocking bands, which are more chara…
Abstract In this paper, the crystallization characteristics of polypropylene and low ethylene content polypropylene copolymers with and without nucleating agents were studied by differential scanning calorimetry (DSC) and polarized light microscopy (PLM). In order to determine the nonisothermal crystallization rate of…
Abstract Heat sealing of films, i. e., formation of a joint between two films by placing them fleetingly between heated platens, was experimentally investigated for a variety of semicrystalline polyolefins, especially various polyethlenes, to determine how sealing temperature affected seal strength measured at room te…
The rare-earth gallium oxide perovskites RGaO 3 (R=La,Pr,Nd) are promising substrates for epitaxy of high-T c superconductors. In this paper the crystal structures of orthorhombic and rhombohedral RGaO 3 have been studied by neutron diffraction, which allows precise localization of light atoms such as oxygen, which ar…
Abstract Relatively uniform polymeric microspheres, the coefficients of variation being close to 10%, were obtained by the BPO‐initiated suspension polymerization of styrenic monomers. Unlike the conventional stirred‐tank system, a particular microporous glass membrane (SPG) provided uniform monomer droplets continuou…
Addition of small quantities (10–20 μg/ml) of a lipid binding protein from wheat to degassed beer was shown to significantly reduce lipid induced destabilisation of beer foam. The protein was found to be very effective against addition of free fatty acids, phospholipid and triglycerides to beer prior to foaming. The m…
The process of developing materials for use in energy-conversion machines based upon fission or fusion reactors is critically dependent upon subjecting those materials to the thermal and neutronic environment that reproduces, as closely as possible, that expected in a power-producing reactor. Materials scientists make…
Reduction-dissolution kinetics and apparent activation energies (Ea) of reagent grade β-MnO2 (Fisher Scientific, Fair Lawn, NJ), β-MnO2 (Ward's Earth Science, Rochester, NY pyrolusite), and MnOOH (Ward's Earth Science, Rochester, NY manganite) were determined by continuous gasometric analysis employing an isothermal a…
In the present work, the characteristics of complete solid solution systems with respect to the change of cohesive energy and the nature of chemical bonds have been examined by the calculation of energy and Mulliken’s population of cluster models by the extended Hückel method.The results of the present work are as fol…
The intergranular corrosion resistance in the bonded joint of austenitic stainless steel by diffusion bonding with an amorphus insert metal containing 1.5 mass% boron was investigated to clarifiy the optimum bonding condition on which austenintic stainless steel pipes are joined using a high speed diffusion bonding sy…
The effects of high absorbed dose on the reusability of CaF2:Mn thermoluminescence dosimeters (TLDs) are investigated to determine a recommended upper limit on absorbed dose for TLDs that are to be reused. This investigation examines degradation in the uniformity of response and changes in sensitivity of a batch of TL…
The area of application of Second Harmonic Generation (SHG) technique is broadening now. Besides the search for new nonlinear crystals there are examples of SHG researches of equilibria of ferroelectric solid solutions and investigations of kinetics of noncetrosymmetric phases formation in the course of chemical react…
Calcium carbonate precipitation by 63 strains of moderately halophilic bacteria (Vibrio spp.) isolated from water of a saltern pond has been studied, taking into account the influence of salinity and temperature on the quantity and type of crystals precipitated. The bacteria formed crystals under all the conditions te…
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The high speed impact method for the surface modification of particles, called the NARA Hybridization System, is one of the most highlighted one among the methods for developing various particles. The key machine which joins many fine powder to the surface of a core particle through a dry and mechanical method can be…
The effects of SiO2 substitution for P2O5 on the structure and properties of phosphate glass with the base composition 60P2O5⋅10PbO⋅20ZnO⋅10Li2O were investigated. Glass was formed when there was less than 25.0% SiO2 substitution for PO5/2. From measurements of Fourier-transform infrared spectroscopy and X-ray fluores…