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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 105 (1982), S. 75-81 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Resacetophenonoxim-Formaldehyd-Harze erwiesen sich für verschiedene Metallionen als selektiv komplexierende Ionenaustauscherharze. Zur Bestimmung der Selektivität wurde eine Gleichgewichts-batch-Methode angewandt. Die Methode beinhaltet die Messung der Verteilung eines gegebenen Metallions zwischen einer wäßrigen Lösung und dem Harz. Die Untersuchung wurde in einem weiten pH-Bereich und in Medien verschiedener Ionenstärke durchgeführt.
    Notes: Resacetophenoneoxime-formaldehyde resins showed to be selective chelating ion exchange resins for certain metal ions. A batch equilibrium method was used in the study of the selectivity of metal ion uptake. The method involved the measurement of distribution of a given metal ion between an aqueous solution and the resin. The study was carried out over a wide pH range and in media of various ionic strengths.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 93 (1981), S. 11-17 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Resacetophenon-Formaldehyd-Harze erwiesen sich für verschiedene Metallionen als selektiv komplexierende Ionenaustauscherharze. Zur Bestimmung der Selektivität der Metallionenaufnahme wurde eine Gleichgewichts-batch-Methode angewandt. Die Methode beinhaltet die Messung der Verteilung eines gegebenen Metallions zwischen einer wäßrigen Lösung und dem Harz. Die Untersuchung wurde über einen weiten pH-Bereich und in Medien verschiedener Ionenstärke durchgeführt.
    Notes: The resacetophenone-formaldehyde (RAP-F) resin showed to be a selective chelating ion-exchange resin for certain metal ions. A batch equilibration method was used in the study of the selectivity of metal ion uptake. The method involved the measurement of distribution of a given metal ion between an aqueous solution and the resin. The study was carried out over a wide pH range and in media of various ionic strengths.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 93 (1981), S. 1-10 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es werden die Synthese und Eigenschaften eines Resacetophenon (2,4-Dihydroxiacetophenon)-Formaldehyd Harzes beschrieben. Das mittlere Molekulargewicht des Harzes, durch Dampfdruckosmometrie und wasserfreie konduktometrische Titration bestimmt, beträgt 2500 bzw. 2200 g/mol.Von diesem Harz wurden Cu(II)-, Ni(II)- und Co(II)-Chelate hergestellt. Die Elementaranalyse der Chelate ergab ein Verhältnis Metall : Ligand von 1:2. Aus den Reflexionspektren der Chelate konnte geschlossen werden, daß Ni(II)- und Co(II)-Chelate eine tetraedrische Struktur haben, während Cu(II)-Chelate eine quadratisch-ebene Struktur zeigen. Infrarotuntersuchungen zeigen, daß die Metalle über den Sauerstoff der Carbonyl-und Phenolgruppe gebunden sind. Auch die Anwesenheit von Methylenbrücken ist aus den IR-Messungen zu erkennen. Die thermischen Eigenschaften des Harzes und seiner Metallchelate werden diskutiert.
    Notes: Synthesis and properties of a resacetophenone-formaldehyde resin are described. The number average molecular weight of the resin determined by vapour pressure osmometry and nonaqueous conductometric titration is 2500 and 2200 g/mol, respectively.Cu(II), Ni(II) and Co(II) chelates of the resin were prepared. The elemental analysis of chelates indicated a metal to ligand ratio 1:2. From the diffuse reflectance spectra of the chelates it could be concluded that Ni(II) and Co(II) chelates have a tetrahedral structure while Cu(II) chelate has a square planar structure. Infrared spectral studies showed that the metals are co-ordinated through the oxygen of the carbonyl and phenolic groups. The presence of methylene bridges was also indicated from IR spectral studies. The thermal properties of the resin and its metal chelates are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 2 (1991), S. 197-200 
    ISSN: 1042-7147
    Keywords: Epoxy novolacs ; Glass-reinforced composites ; Mechanical and dielectric properties ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Epoxy Phenolic novolac resins were prepared from the acid catalyzed condensation products of various phenols such as phenol, p-cresol, p-tert-butyl-phenol and cardanol with formaldehyde. All of these resins have been utilized to prepare the glass-reinforced composites. The fabricated composites were evaluated for their mechanical and dielectric properties. The incorporation of an epoxy fortifier yielded a significant improvement in mechanical properties.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 561-566 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyethers are prepared by condensing, respectively, 2,4-dichloroquinoline and its 6-methyl and 6-methoxy derivatives separately with ethylene, propylene, butylene, diethylene and triethylene glycols. These polyethers are characterized and the electrical conductivity of polyethers is measured at various temperatures up to 150°C.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 26 (1988), S. 2279-2304 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An important limiting factor in the accurate modelling of fluid flow problems is the numerical representation of the convection terms in the Navier-Stokes equations. This paper reviews several approaches used to approximate the convection terms and reduce the so-called false-diffusion errors, within the context of finite-difference and finite-volume methods. Numerical errors are characterized as those due to discretization of the differential terms and those due to the influence of the multidimensional nature of the flow. Necessary criteria are identified which a numerical scheme must satisfy, if it is to be a candidate, at least in terms of accuracy and practicality, for the successful solution of the Navier-Stokes equations. One of the criteria is the need of the scheme to account explicitly for the multidimensionality of the flow in the transport of scalar variables. All schemes except Raithby's SKEW approximation are deficient in this respect. However, the SKEW scheme does not satisfy some of the other criteria and does not always perform well. A new scheme called CUPID (Corner UPwInDing), which is based on the ideas of the SKEW scheme, yet obeys more of the criteria identified above, is described. The scheme is tested on a series of discriminating test problems which, the authors contend, demonstrate its potential for practical use in solving accurately the Navier-Stokes equations.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 97 (1981), S. 171-177 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Kondensation von o-Hydroxyacetophenon mit 1,2-Dichlorethan in Gegenwart von wasserfreiem Aluminiumchlorid wurden Harze hergestellt. Natur und Eigenschaften dieser Harze wurden mittels Spektroskopie, Dampfdruckosmometrie, Leitfähigkeitstitration und Thermogravimetrie untersucht.
    Notes: Resins based on condensation of o-hydroxyacetophenone with 1.2-dichloroethane in presence of anhydrous aluminum chloride were prepared. The nature and properties such as spectral, molecular weight by vapour pressure osmometry, conductometric titration and thermal behavior of these resins were studied.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 97 (1981), S. 69-77 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Koordinationspolymere von polymeren Schiffschen Basen aus 5,5'-Methylen-bis-salicylaldehyd und 4,4′-Diaminodiphenylmethan mit Kupfer, Nickel, Kobalt, Mangan und Zink wurden hergestellt. Elementaranalysen wurden gemacht, die magnetischen, spektralen und thermischen Eigenschaften und die elektrischen Leitfähigkeiten der Chelate wurden bestimmt und wahrscheinliche Strukturen festgelegt.Die analytischen Daten deuten auf eine Formel [ML]n für die Chelate hin. Die Koordination des Liganden mit den Metallionen wird durch Vergleich der IR-Spekten von Ligand und Polychelaten erlätert. Alle Polychelate sind stabil und unlöslich in den üblichen Lösungsmitteln.
    Notes: Coordination polymers of copper, nickel, cobalt, manganese, and zinc with poly(Schiff base) derived from 5,5'-methylene-bis-salicylaldehyde and 4,4'-diaminodiphenyl methane have been prepared. Elemental analysis, magnetic, spectral, and thermal properties, and electrical conductivities of the chelates have been studied and probable structures assigned to the chelates.The analytical data propose a [ML]n formula for the chelates. The site of coordination of the ligand with metal ions has been elucidated by comparing the IR spectra of the ligand and polychelates. All the polychelates are stable and insoluble in common solvents.
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 80 (1979), S. 171-175 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymere Metallkomplexe aus 3,3′-Benzidindicarbonsäure und den bivalenten Metallionen Kupfer, Nickel, Kobalt, Zink und Mangan wurden synthetisiert; ihre Eigenschaften, Zusammensetzung, IR-Spektren und magnetische Suszeptibilität wurden untersucht. Die gefärbten, pulvrigen Feststoffe wurden erhalten, indem die Metallacetate und der Ligand im geeigneten Verhältnis ca. 1/2 h am Rückfluß erhitzt und dann bei 110°C getrocknet wurden. Die Produkte sind stabil und in normalen Lösungsmitteln unlöslich.Die analytischen Daten zeigen die allgemeine Formel [ML]n für Cu(II) und Mn(II) an, dagegen die Formel [M4L5]n für Ni(II), Co(II) und Zn(II). Die Art der Koordination des Liganden mit den Metallionen wurde ermittelt durch Vergleich von IR-Spektren des Liganden und des Komplexes. Es wird eine polymere Struktur vorgeschlagen.
    Notes: Polymeric metal complexes of 3,3′-benzidine dicarboxylic acid with bivalent metal ions such as copper, nickel, cobalt, zinc and manganese have been synthesized and their properties, composition, IR-absorption spectra and magnetic susceptibilities were investigated. The coloured, powderly solids were obtained by refluxing the metal acetate and the ligand in the appropriate ratio for about half an hour and dried at 110°C. The compounds are stable and insoluble in common solvents.The analytical data indicate the general formula, [ML]n for Cu(II), Mn(II) and [M4L5]n for Ni(II), Co(II) and Zn(II). The mode of coordination of the ligand with metal ions has been elucidated by comparing IR spectra of the ligand and the complexes. A polymeric structure is proposed for the complexes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 102 (1982), S. 103-108 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In dieser Arbeit wird die Herstellung von Methylacrylat/N-Phenylmaleimid-Co-polymeren verschiedener Zusammensetzung durch radikalische Polymerisation in Cyclohexanon mit Azoisobutyronitril als Initiator untersucht. Die Molenbrüche für N-Phenylmaleimid der vier Copolymeren MP-1, MP-2, MP-3 und MP-4 sind 0,0664,0,2344, 0,3905 und 0,5445. Die Zusammensetzung der Copolymeren wurde durch Elementaranalyse bestimmt. Weiter wird die änderung der Huggins-Konstante KH mit der Zusammensetzung für die Copolymeren in den Lösungsmitteln Dimethyl-formamid, Methylethylketon und Cyclohexanon beschrieben. KH hängt vom Lösungsmittel und von der Zusammensetzung der Copolymeren ab.
    Notes: This paper deals with the synthesis of methyl acrylate/N-phenylmaleimide copolymers having different compositions, (mole fractions of N-phenylmaleimide for the four copolymers MP-1, MP-2, MP-3, and MP-4 are 0.0664, 0.3905 and 0.5445, respectively) by free radical solution polymerization in cyclohexanone using azoisobutyronitrile as an initiator. The compositions of the copolymers have been determined by elemental analysis. The variation of the Huggins constant KH with composition for the copolymers in three solvents, methyl ethyl ketone, dimethylformamide and cyclohexanone is described. KH is found to be dependent both on solvent and composition of the copolymers.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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