Materials Literature
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Abstract A series of works with the aim of clarifying the mechanisms of thermal and photochemical degradation of PVC are reviewed. They include studies on: i) degradation of PVC samples of various tacticities; ii) degradation of PVC after modification by stereoselective nucleophilic substitution; iii) influence of tem…
The electronic-energy-straggling values for 50--250-keV ${\mathrm{H}}^{+}$ beams penetrating Cu, Ag, and Pt have been measured using backscattering. The Cu, Ag, and Pt layers with a thickness of about 30 nm were deposited onto Si, ${\mathrm{SiO}}_{2}$, ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, and ${\mathrm{ZrO}}_{2}$ su…
Abstract New measurements of the heat capacity in the melt of poly(trimethylene succinate) (PTMS), poly(trimethylene adipate) (PTMA), and poly(hexamethylene sebacate) (PHMS) from 310 to 400 K are presented. Based on these data and literature data on eight other molten polylactones and poly(ethylene sebacate) (PES), an…
Abstract Changes in the fine structure of cellulose samples of different origin during treatment with sodium hydroxide in ethanol/water mixtures were studied. A computer program was written for peak separation and profile analysis. The presence of an amorphous phase was taken into account by adding a Gaussian type fun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShort synthesis of (.+-.)-5-(3-furyl)octahydro-8-methylindolizines, alkaloids related to a component of Castoreum. Use of radical cyclizationDerrick L. J. Clive and Raymond J. BergstraCite this: J. Org. Chem. 1991, 56, 16, 4976–4977Publication Date (Print):August 1, 1991Publ…
Abstract Tenside sind wegen ihrer vielseitigen Einsatzmöglichkeiten ein unverzichtbarer Bestandteil unseres Lebens. Sie dienen nicht nur zum Waschen und Reinigen, sondern auch zur Herstellung von Textilien, kosmetischen Produkten, Nahrungsmitteln, Kunststoffprodukten, Lacken und Farben. Weniger bekannt ist ihr Einsatz…
Abstract There is still controversy over the relative efficiency and stabilization mechanisms of secondary and tertiary HALS. In this study the performance of secondary HALS is compared with that of corresponding hindered amines bearing various substitutents at the sterically hindered nitrogen atom. The bulk of the st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation of liquid crystalline cyanoethylated O-(2,3-dihydroxypropyl)celluloseTakaya Sato, Yoshinobu Tsujii, Yasuo Kita, Takeshi Fukuda, and Takeaki MiyamotoCite this: Macromolecules 1991, 24, 16, 4691–4697Publication Date (Print):August 1, 1991Publication Histo…
Abstract The electrochemical behaviour of a sintered stainless steel and of a wrought AISI type stainless steel of the same composition were compared. The electrochemical measurements used were the evolution of the corrosion potential vs time, the anodic and cathodic polarizations and the current‐time transients. Comp…
The purpose of this article is to examine information regarding the antibacterial characteristics of silver when used in drinking water treatment, available data on bacterial populations in effluents from silver‐impregnated filter units, regulatory and test programs relating to the bacteriostatic action of silver in f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTField-stimulated electron promotion from core 4f-orbital to out-of-core .sigma.6s orbital phenomenon in simple lanthanide compoundsI. GotkisCite this: J. Phys. Chem. 1991, 95, 16, 6086–6095Publication Date (Print):August 1, 1991Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinated molecules. 87. Isolation of the first anionic five-coordinated silicates with six- and seven-membered oxygen-containing ringsK. C. Kumara Swamy, Channareddy Sreelatha, Roberta O. Day, Joan Holmes, and Robert R. HolmesCite this: Inorg. Chem. 1991, 30, 16, 312…
Abstract Melt crystallization manufacturing systems are characterized mathematically and optimized. Directional solidification and sweating are modeled, and the results are correlated to plant data. A nonlinear programming algorithm is constructed to determine the optimal design and operation of a production plant. Pr…
The interaction of the La (III) and Tb (III) ions with adenosine-5'-monophosphate (5'-AMP), guanosine-5'-monophosphate (5'-GMP), and 2'-deoxyguanosine-5'-monophosphate (5'-dGMP) anions with metal/nucleotide ratios of 1 and 2 has been studied in aqueous solution in acidic and neutral pHs. The solid complexes were isola…
This article summarizes our ultrastructural studies on the organization of the thylakoid membrane of green algae and higher plants. We have used freeze-fracture and immunogold labeling to investigate the lateral distribution of the components in the membrane, their interactions, and the folding of their polypeptide ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual proton NMR properties of tungsten(II) tris(pyrazolyl)borate hydride complexesA. J. M. Caffyn, S. G. Feng, A. Dierdorf, A. S. Gamble, P. A. Eldredge, M. R. Vossen, P. S. White, and J. L. TempletonCite this: Organometallics 1991, 10, 8, 2842–2848Publication Date (Print…
The oxidation ability of O 2 , O 3 , atomic oxygen, NO, N 2 O, and NO 2 was estimated by thermodynamic calculation. The calculation was carried out on the equilibrium state of Cu 2 O/CuO, considering the temperature dependence of Gibbs free energy of formation. Gases such as NO 2 , O 3 , and atomic oxygen were proven…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-phase model for continuous final-stage melt polycondensation of poly(ethylene terephthalate). 2. Analysis of dynamic behaviorHerve Castres Saint Martin and Kyu Yong ChoiCite this: Ind. Eng. Chem. Res. 1991, 30, 8, 1712–1718Publication Date (Print):August 1, 1991Publicati…
Abstract New tetraphenylated heterocyclic diol, 2,5‐bis(4‐hydroxyphenyl)‐3,4‐diphenylfuran, was synthesized by the oxidative coupling of 4‐methoxydeoxybenzoin as a starting material, followed by simultaneous cyclodehydration and demethylation. Tetraphenylfuran‐containing polyarylates with inherent viscosities of 0.2–0…
The sensation of warmth or coolness to touch when skin is brought into contact with a fabric is a transient heat conduction phenomenon and contributes to the per ception of comfort of a garment. The aim of this study is to establish what fabric properties influence thermal touch sensations. Experiments were conducted…