Materials Literature
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Abstract Since 4‐vinylbenzyl N,N ‐diethyldithiocarbamate (VBDC) polymer easily cleaves at the C—S bond and generates benzyl radical, graft copolymerization of methyl methacrylate (MMA) or 4‐vinylpyridine (VPy) onto VBDC polymer is easily performed by UV irradiation. The structural analyses of the graft copolymers are…
Abstract Cellulose‐hydroxamic acid derivatives, which were reported as a novel cellulose derivative were prepared from dialdehyde celluloses obtained by periodate oxidation of cellulose, and certain properties of unusual cellulose derivative containing hydroxamic acid groups and of various metal complexes formed with…
Abstract Four kinds of annealed polyethylene (PE) films with varying densities were photo‐irradiated with a medium pressure mercury lamp. Photodegradation processes were followed by ultraviolet (UV) and Fourier transform infrared (FTIR) spectroscopic techniques and by gel and mechanical property measurements. Oxygenat…
Abstract A process has been developed for continuous photoinitiated graft copolymerization of acrylamide (AM) and acrylic acid (AA) onto the surface of high‐density polyethylene (HDPE) tape film, presoaked in a solution containing monomer and initiator under nitrogen atmosphere. As photoinitiator we have used benzophe…
Several experiments were performed in order to understand the creation and readout mechanisms of photostimulable (PS) centers in BaFBr:${\mathrm{Eu}}^{2+}$ single crystals. PS centers can be efficiently created starting from 6.7 eV, i.e., the minimal energy required to excite the first valence exciton. This exciton re…
Abstract Poly(aryl‐ether‐ether‐ketone) (PEEK) has been heated at 400°C in both nitrogen and air. The extent of thermal degradation has been monitored by a variety of techniques including: solution viscometry, UV‐visible spectroscopy, 13 C high‐resolution cross‐polarization/magic angle spinning nuclear magnetic resonan…
Abstract Structure of Bombyx mori silk fibroin membrane insolubilized with methanol, especially in the swollen state, is studied by means of spin‐label ESR, 13 C‐NMR, and FT‐IR (ATR method) spectroscopies. FT‐IR data indicate that the conformational transition from random coil to antiparallel β‐sheet occurs at the sur…
Sea urchin skeletal elements are composed of single crystals of calcite. Unlike their synthetic counterparts, these crystals do not have well-developed cleavage and are consequently much more resistant to fracture. This phenomenon is due in part to the presence of acidic glycoproteins occluded within the crystals. By…
Abstract The NMR relaxation time T1 of 1H and that of 19F were determined for polypyrrole and polythiophene doped with trifluoromethanesulfonate (triflate) or perchlorate ions. The 1H T1 is governed by the paramagnetism of the polymer chains. The 19F T1 of the triflate ions is explained by the combined effect of the F…
Abstract The theory of light‐scattering intensities originally discussed by Fleury and developed recently by the present authors for LaP 5 O 14 was applied to the second‐order ferroelectric phase transition in tris(sarcosine)calcium chloride, (CH 3 NHCH 2 COOH) 3 CaCl 2 · It was found that the combination of critical…
Abstract Vulcanization by peroxide and sulfur are the two common methods to crosslink diene elastomers. Crosslinks using peroxide are simple carbon-carbon covalent bonds, whereas, with sulfur, a distribution of sulfur linkages, S x , of various rank, x , may be present. Networks in which x=1 exclusively are said to be…
Modeling was carried out on vapor-liquid equilibria of nitric acid containing highly concentrated fission product nitrates to simulate the evaporation characteristics of a reprocessing plant high-level liquid waste (HLLW) concentrator. Results obtained with the model verified its reliability for prediction of vaporliq…
Abstract New dioxygen molybdenum porphyrins were formed by the introduction of dioxygen into the toluene solutions of oxomolybdenum(IV) porphyrins, MoIVO(tpp) and MoIVO(oep), around −70 °C. By raising the temperature to 25 °C, or by the photoirradiation of the solutions with the wavelength of the Soret bands, the pare…
Abstract [3‐ 13 C]‐Ethyl farnesoate was prepared by alkylating 3‐ 13 C‐ethyl acetoacetate with geranyl bromide, followed by hydrolysis, decarboxylation and treatment with the anion of triethyl phosphonoacetate. The ester was reduced with LAH, brominated with CBr 4 /ϕ 3 P, and the farnesyl bromide coupled with CuI/Li‐p…
Constant elongation rate tests and constant load, subcritical crack growth tests were used to investigate the stress corrosion cracking (SCC) susceptibility of metastable (type 301 [UNS(1) S30100]) and stable (type 310S [UNS S30108]) austenitic stainless steels in H2SO4/NaCl aqueous solutions at 25°C. For annealed typ…
Abstract The passivation behaviour and pitting corrosion of a commercial grade α‐brass (Cu/Zn:63/37) in neutral buffer solutions (borate and phosphate) in the presence and absence of chloride ions were investigated by electrochemical techniques. The results indicated the dezincification in absence of chloride ions at…
(N(CH3)4)2ZnBr4 undergoes a ferroelastic phase transition from an orthorhombic mmm structure to a monoclinic 2/m phase. Birefringence and optical indicatrix rotation about the monoclinic axis have been measured in the ferroelastic phase and their temperature dependences have been related to the order parameter of the…
Abstract Raman spectra of CsI3 and Cs2I8 crystals were measured for the samples whose structures were carefully examined. The surface of Cs2I8 samples was found to turn into CsI3 when they were kept in air. The heating effect of laser irradiation was shown to change the spectra of Cs2I8 samples to those of CsI3. These…
Article Microstructure and Properties of As-Cast Intermetallic Mg2Si-Al Alloys / Microstructure and Properties of As-Cast Intermetallic Mg2Si-Al Alloys was published on November 1, 1990 in the journal International Journal of Materials Research (volume 81, issue 11).
Square holes observed in the walls of the pennate diatoms may be due to cubic crystals inside the silicalemma that interfere with silica deposition, or cause its dissolution shortly after deposition. Their presence is consistent with models of valve morphogenesis by diffusion limited precipitation of amorphous silica…