Materials Literature
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Alumina powder compacts sintered at various temperatures were isostatically hot‐pressed. The specimens sintered to the closed‐pore state can be densified further by hot isostatic pressing. If the open pores are eliminated during sintering, sintering at a low temperature is desirable to achieve a full densification aft…
Abstract The melting points of miscible blends prepared from two crystalline polymers, poly(caprolactone) (PCL), and Saran a random copolymer of vinylidene chloride with vinyl chloride [P(VCl 2 ‐VC)], vinyl acetate [P(VCl 2 ‐VA)], or acrylonitrile [P(VCl 2 ‐AN)], have been measured by differential scanning calorimetry…
Published reports suggest that silver ions may catalyze the oxidation of poly(ether)urethane soft-segments resulting in the failure of urethane insulations of specific models of pacemaker leads. Attempted oxidation of soft-segment models, poly(tetra-methylene ether)glycols, by silver nitrate has shown that metal-ion c…
An analytical method has been developed for assessing crash dynamics of large transport aircraft, such as in the NASA Controlled Impact Demonstration (CID) jet crash test on December 1, 1984. The DYCAST nonlinear finite-element computer code was used in a series of progressively more difficult tasks to model complete…
Abstract Secondary‐structure prediction has been used to investigate the conformation of the N‐ and C‐terminal telopeptides for type I and type III collagen. The three predictive methods (Chou and Fasman, Robson and co‐workers, Lim) indicate mainly aperiodic conformations. A common structural motif is provided by the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics of poly(propylene terephthalate) studied by rapid-scanning Raman spectroscopy and FT-IR spectroscopyBernard J. Bulkin, Menachem Lewin, and Jongsoo KimCite this: Macromolecules 1987, 20, 4, 830–835Publication Date (Print):April 1, 1987Publication Hist…
The optical properties of MgF(2) films prepared by evaporation and ion-assisted deposition have been determined from transmittance and near-normal incidence reflectance measurements and also from electron-energy loss spectroscopy (EELS). The results show that oxygen-ion assistance leads to higher extinction coefficien…
Abstract A model of pore structure evolution has been developed for gas‐solid reactions exhibiting pore closure behavior. A cylindrical pore network of constant coordination number is used to represent the porous medium, and both discrete and continuous distributions of pore size are considered. The mathematical model…
Abstract The synthesis of the liquid crystalline polysiloxanes 8a‐c is reported. In these polymers carbazolyl groups are incorporated in the mesogenic units. 8a‐c were prepared from the Schiff's bases 7a‐c and poly(hydrogenmethylsiloxane) in a polymer analogous reaction. The liquid crystalline polymers were characteri…
Abstract The formal redox potentials of 12-molybdophosphate and 12-molybdosilicate up to the twelve-electron reduction per heteropolymolybdate ion were determined by cyclic voltammetry at a glassy carbon electrode in 50% (v/v) water-organic media containing some inorganic acids. These heteropolymolybdates in the prese…
Abstract Three binuclear copper(II) complexes of N,N′,N″,N'″-tetrakis(2-aminoethyl)-1,4,8,11-tetraazacyclotetradecane (taec), [Cu2(taec)N3](ClO4)3 (1), [Cu2(taec)(NCO)](ClO4)3 (2), and [Cu2(taec)(NCS)2](ClO4)2·H2O (3), were prepared and characterized. The crystal structures of these complexes were determined by single…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of manganese(IV)-oxo-porphyrin derivatives by decomposition of peroxycarbonate complexesM. Schappacher and R. WeissCite this: Inorg. Chem. 1987, 26, 8, 1189–1190Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of surface-conductive polyimide films via in situ codeposition of metal saltsJ. D. Rancourt and L. T. TaylorCite this: Macromolecules 1987, 20, 4, 790–795Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published…
Since the experiment of Shechtman et al. which suggests the crystal with the pentagonal symmetry (quasicrystal), there has been a lot of interest in the quasiperiodic systems. These can be regarded as being intermediate between ordered and disordered systems, and novel physical properties are expected. In fact, the qu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic oxidation of hydrocarbons by (5,10,15,20-tetraphenylporphyrinato)manganese(II) perchlorate and periodateKenneth S. Suslick, Francis V. Acholla, and Bruce R. CookCite this: J. Am. Chem. Soc. 1987, 109, 9, 2818–2819Publication Date (Print):April 1, 1987Publicati…
Abstract Fourier transform infrared (FT‐IR) studies of poly(ethylene terephthalate) (PET)/poly/(amide‐6,6) (PA) blends are presented. The blends were prepared in the molten state and in solution with trifluoroacetic acid (TFA) as the solvent. The PET/PA blend is a complex system containing, two crystallizable polymers…
Low Energy Electron Diffraction (LEED) is one of the most commonly used techniques for crystal surface characterization at the atomic level, but is frequently only used as a monitor of surface order. The full potential of LEED as a tool for surface crystallography is not often exploited, primarily because the method h…
An established method for measuring complex rf magnetic permeability is based on the change in inductance and resistance of a coaxial transmission line upon insertion of a sample toroid. It is not necessary to wind coils on the toroid or correct for geometric demagnetization factors. The use of modern commercial imped…
Abstract Relations describing sedimentation equilibrium in solutions of self‐associating macromolecules at arbitrary concentration are presented. These relations are obtained by using scaled‐particle theory to calculate the thermodynamic activity of each species present at a given radial distance. The results are expe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAzoalkanes as electron donors in charge-transfer complexes. Molecular structures with sacrificial (.pi.*,.sigma.*) and increvalent (v) electron acceptorsS. C. Blackstock and J. K. KochiCite this: J. Am. Chem. Soc. 1987, 109, 8, 2484–2496Publication Date (Print):April 1, 1987…