Materials Literature
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Abstract The deformation of biaxially oriented polypropylene sheet produced by the BeXor process has been examined in terms of the hierarchical solid state structure described previously. The mechanical properties have been examined over a range of temperatures and strain rates. The anisotropic nature of uniaxial tens…
Abstract We studied clay mineralogical and chemical properties of Murtip and Quillayute soils from Oregon that are classified as Typic Dystrandepts. The soils are nonallophanic and have clay fractions dominated by chloritized 2:1 minerals. Both showed chemical properties similar to those of most nonallophanic Andisols…
Abstract Palladium catalyzed reaction of acyltins with organic halides were investigated. Among the halides, acyl halides and allylic halides were good substrates, and the latter gave allylic ketones in good yields.
Sn-doped indium oxide (ITO) films have been prepared on the polyester substrate by reactive magnetron sputtering at different oxygen pressures and subsequent annealing in air at 170 °C. Highly transparent ITO films with a low resistivity of 1.8×10−4 Ω cm have been obtained by annealing suboxide films deposited in a li…
The oxidation of copper single crystals is known to proceed at different rates on different crystal faces. To determine whether this behavior extends to subsequent atmospheric sulfidation as well, we have exposed polycrystalline copper and (100), (110), and (111) single crystals of copper to low concentrations of hydr…
The crystallography of diffusion‐induced and diffusionless cubic‐to‐tetragonal phase transformations in the ZrO 2 ‐Y 2 O 3 system is examined on the basis of the phenomenological crystallographic theory by adopting the lsqb;011rsqb; (0 1 1) twinning system as the lattice invariant deformation system. Numerical calcula…
Cab-O-Sil powder is a cluster aggregate of silica spheres formed from silica smoke. The fractal dimension of clusters of 14 nm diameter spheres is determined to be [Formula: see text], in good agreement with that calculated for the cluster-aggregate model, [Formula: see text]. Measurements of Young's modulus (Y) of pa…
The flexural fatigue properties were studied for PP injection-molded samples of different molecular weight and well-defined skin-core morphology (see Part I). It can be clearly seen that the crack initiation always occurs in the subskin layer of higher macromolecular orientation, and propagates towards the core. The m…
Batch cultures of Desulfovibrio vulgaris stored at 32 degrees C for 10 months have been found to retain 50% of the hydrogenase activity of a 1-day culture. The hydrogenase found in old cultures needs reducing conditions for its activation. Viable cell counts are negative after 6 months, showing that the hydrogenase ac…
Abstract Orientation in injection moldings of polypropylene (PP), polyethylene (PE), polyamide 6 (PA‐6), and polystyrene (PS) was investigated by transmission and reflection infrared spectroscopy. Orientation of the surface was measured by the reflection method, the depth profiles of orientation and of the fraction of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe f-element/crown ether complexes. 5. Structural changes in complexes of lanthanide chloride hydrates with 18-crown-6 accompanying decreases in Ln3+ ionic radii: synthesis and structures of [M(OH2)7(OHMe)][MCl(OH2)2(18-crown-6)]2Cl7.cntdot.2H2O (M = yttrium, dysprosium)Rob…
Abstract Following the ester‐amide interchange reaction in the poly(ethylene terephthalate)/poly(amide‐6, 6) (PET/PA) system in the presence of p‐toluenesulfonic acid (TsOH), samples were injection molded and tested in the tensile mode. A brittle fracture was observed for these unoriented specimens. To separate the in…
Thin, amorphous films of carbon have been deposited by conventional and hollow cathode enhanced magnetron sputtering of a pyrolytic graphite target. Films in the range of 15 to 200 nm were deposited over a pressure range or 50 to 0.1 mTorr on fused silica, sapphire, and Si substrates at 20 °C. Langmuir probe measureme…
We have investigated the dynamics of methyl group reorientation in solid methyl-substituted phenanthrenes. The temperature dependence of the proton spin–lattice relaxation rates has been measured in polycrystalline 3-methylphenanthrene (3-MP), 9-methylphenanthrene (9-MP), and 3,9-dimethylphenanthrene (3,9-DMP) at Larm…
Abstract The products in inductively coupled plasma excited in organosilicic compounds were studied on chemical structures by spectroscopic methods. Plasma‐polymerized tetramethylsilane (PA) contains not only SiCH 3 groups but also SiH groups on IR and 29 Si‐NMR analyses. 13 C‐NMR spectrum of PA reveals that the cro…
The hydriding of thick Mg films with a 50–100 Å Pd film on top, as catalyst for H2 dissociation, was investigated by quartz-crystal microbalance uptake measurements in a combined UHV and high-pressure equipment. Unusual kinetics are observed: (i) the hydrogen uptake saturates far from MgH2 at room temperature and (ii)…
Abstract Biaxially oriented poly(ethylene terephthalate) (PET) films have been characterized by small angle and wide angle x‐ray scattering. The films were studied at various rotational angles to the impinging beam and orientations relative to axes in three directions in the film were obtained. Pole figures were devel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBifunctional activation of ketone with rhodium(III) porphyrin. Efficient cooperation of metal and intramolecular baseYasuhiro Aoyama, Atsushi Yamagishi, Yasutaka Tanaka, Hiroo Toi, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1987, 109, 15, 4735–4737Publication Date (Prin…
The thermolysis of two compound series, namely, and was studied by differential scanning calorimetry, differential thermal analysis, and thermogravimetry. Product identification and confirmation of thermolysis pathways were accomplished by x‐ray powder diffraction analyses, moisture evolution analyses, and IR spectros…
The magnitude of specular and diffuse Fresnel reflectance from powdered samples was investigated with the use of an FT-IR spectrogoniophotometer with wire-grid polarizers mounted in front of and behind the sample. Specular Fresnel reflectance maintains the polarization of the incoming infrared beam and can therefore b…