Materials Literature
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Achievement of good formability in aluminium sheet requires control of the final texture. Earing in deep drawing is a common problem in aluminium sheet and can be minimised by careful texture control. In practice, this means the control of recrystallisation during thermomechanical processing as well as control of part…
Capacitor-grade polypropylene films were aged under multiple stresses (electrical, thermal, and radiation). The aging experiments were performed for both singular and simultaneous combined stresses. The polypropylene was exposed to combined neutron-gamma radiation with a total dose of 1.6*10/sup 6/ rad, electrical str…
Impurity levels in Cd-doped GaSe have been studied by using photoluminescence (PL) measurements. The PL spectra at 77 K are dominated by three new emission bands at 1.95, 1.75, and 1.62 eV. The PL intensity and the peak energy of the 1.95 and 1.62 eV emission bands are measured as a function of the temperature. It is…
We report formation of the Nd2Fe14B-type compounds Y2Fe14C and Ce2Fe14C via heat treatment of melt-spun ribbons. The existence of several R2Fe14C (R≡rare earth) phases has been documented in the literature, but the light R compounds are extremely difficult to prepare by conventional procedures. In particular, the yttr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic oxides: oxidation of (.eta.-C5Me5)2V with O2 to form [(.mu.-.eta.3-C5Me5O3)V(O)]2, [(.eta.-C5Me5)V]4(.mu.-O)6, and (.eta.-C5Me5)6V8O17Frank Bottomley, C. Philippe Magill, and Baiyi ZhaoCite this: Organometallics 1991, 10, 6, 1946–1954Publication Date (Print):J…
Abstract Static pressure usually increases the transition temperatures of polymers by decreasing their free volume. If the pressurizing medium is soluble in the polymer matrix, the opposing effect of increasing the free volume is possible. Those shifts of transition temperatures were monitored with a medium‐pressure D…
Abstract To identify the far-infrared (FIR) absorption bands related to K cations in micas, spectra of muscovite, phlogopite, and biotite were compared with the spectra of pyrophyllite and talc, which have no compensating cations, and to the spectra of micas in which K is substituted by mono- and divalent cations. Dic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of discrete polyenes and norbornene-polyene block copolymers using Mo(CH-t-Bu)(NAr)(O-t-Bu)2 as the initiatorL. Y. Park, R. R. Schrock, S. G. Stieglitz, and W. E. CroweCite this: Macromolecules 1991, 24, 12, 3489–3495Publication Date (Print):June 1, 1991Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and synthesis of thermally labile polymers for microelectronics: poly(vinyl tert-butyl carbonate sulfone)Ying Jiang and Jean M. J. FrechetCite this: Macromolecules 1991, 24, 12, 3528–3532Publication Date (Print):June 1, 1991Publication History Published online1 May 20…
Fourier transform infrared (FT-IR) emission spectroscopy has been used to study both molybdenum oxide and supported molybdenum oxide catalysts. An infrared emission cell was specially designed to treat the samples in vacuo or in various gases over a wide temperature range (25–700°C). The experimental conditions includ…
We have conducted polarized Raman and infrared-reflectance measurements on CuO single crystals. Group theory predicts nine optical vibrations, of which three (${\mathit{A}}_{\mathit{g}}$+2${\mathit{B}}_{\mathit{g}}$) are Raman active and six (3${\mathit{A}}_{\mathit{u}}$+3${\mathit{B}}_{\mathit{u}}$) are infrared acti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of ultrathin films of aromatic polyamides and aromatic poly(amide-imides) by vapor deposition polymerizationYoshikazu Takahashi, Masayuki Iijima, Yoshiyuki Oishi, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1991, 24, 12, 3543–3546Publication Date (…
Abstract In recent years, efforts aimed at producing high‐strength polymers have intensified noticeably. In addition to additive‐based reinforcement, self‐reinforcement without additives represents a way to increase material strength. In this study, the effects of self‐reinforced polyethylene during extrusion with a c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical Young's moduli of poly(p-phenylenebenzobisthiazole) and poly(p-phenylenebenzobisoxazole)Kohji Tashiro and Masamichi KobayashiCite this: Macromolecules 1991, 24, 12, 3706–3708Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure-volume-temperature properties and equations of state in polymer blends: characteristic parameters in polystyrene/poly(vinyl methyl ether) mixturesT. Ougizawa, G. T. Dee, and D. J. WalshCite this: Macromolecules 1991, 24, 13, 3834–3837Publication Date (Print):June 1,…
Abstract The association behavior of protoporphyrin IX was investigated at different pH by absorption spectroscopy and gel chromatography. Protoporphyrin IX existed as monomer in acidic water, as aggregate in neutral water, and as dimer in basic water. Poly(N-vinylpyrrolidone) tended to suppress dimerization and aggre…
In this paper, we systematically develop a hierarchy of constitutive equations at various levels of abstraction for describing the dynamics of incompressible liquid-crystalline systems. We also introduce a corresponding hierarchy of generalized bracket formulations. The simplest brackets, in terms of the direction vec…
AIN powder was synthesized from aluminum polynuclear complexes. Basic aluminum chloride and basic aluminum lactate were used as the aluminum polynuclear complexes. These starting materials and glucose were dissolved in water and mixed homogeneously. AIN powder was obtained by calcining after drying and precalcining at…
L'etude structurale des complexes du cuivre montre qu'il n'y a pas de difference geometrique importante dans les cages Cu 2 (COO) 4 entre les cuivre acetate et cuivre formiate. Les populations electroniques des groupes carboxylate des coordinats pontants sont correlees avec les valeurs −25 des carboxylate des complexe…
Abstract Oedometer swelling and compaction tests up to a maximum pressure of 32 bars were made on the Wyoming montmorillonite SWy-1 with a range of mixed (Na,K) exchange ion compositions. The permeabilities and water diffusivities of the compacted clays were calculated using soil physics theory. Significant inhibition…