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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 131 (1985), S. 135-143 
    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: Poly-8-hydroxychinolin-furfural (8HQ-Fu) wurde durch Kondensation von 8-Hydroxychinolin mit Furfural in Gegenwart von wäßrigem K2CO3 und NaOH als Katalysatoren hergestellt. Dabei wurden die beiden Reaktanden in äquimolaren Verhältnissen eingesetzt. Die Polymerproben wurden durch Elementaranalysen, IR-Spektren und thermogravimetrische Analysen charakterisiert. Das zahlenmittlere Molekularge-wicht (Mn) wurde durch Dampfdruckosmometrie und nichtwäßrige Titration bestimmt. Grenzviskositäten aller Polymerproben wurden in DMF gemessen.Polymere Metallchelate von Cu2+, Fe3+, Co2+, Zn2+, Mn2+, Ni2+ mit 8HQ-Fu wurden hergestellt und charakterisiert.
    Notes: Poly(8-hydroxyquinoline-furfural) (8HQ-Fu) was prepared by condensing 8-hydroxyquinoline with furfural in the presence of aqueous K2CO3 and NaOH as catalysts using equimolar proportions of the two reactants. The polymer samples were characterized by elemental analysis, IR spectra, and thermogravimetric analysis. The number average molecular weight (Mn) was determined both by vapour pressure osmometry and by non-aqueous titration. Intrinsic viscosities of all the polymer samples were measured in DMF.Polymeric metal chelates of Cu2+, Fe3+, Co2+, Zn2+, Mn2+, Ni2+ with the 8HQ-Fu polymer were prepared and characterized.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 132 (1985), S. 61-68 
    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 Herstellung eines Polyazomethins (PSB) durch Kondensation von 4,4′-Dihydroxy-3,3′-dibenzylbiphenyl mit 4,4′-Diaminodiphenylmethan sowie seiner Polychelate beschrieben. PSB wirkt als vierzähliger Ligand. Eine Struktur der Polymeren wird vorgeschlagen. Alle Polychelate außer diejenigen mit Zn(II) als Metall sind paramagnetische, dunkel gefärbte, pulvrige Feststoffe, die unlöslich in gebräuchlichen organischen Lösungsmitteln sind.
    Notes: The preparations of a poly(azomethine) (PSB) via condensation of 4,4′-dihydroxy-3,3′-dibenzylbiphenyl with 4,4′-diaminodiphenylmethane and its polychelates are described. PSB acts as a tetradentate ligand. A structure of the polymers is proposed. All the polychelates except those with Zn(II) as metal are paramagnetic, dark colored powdery solids which are insoluble in common organic solvents.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 130 (1985), S. 125-136 
    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: Die vorliegenden Untersuchungen sollen einen Beitrag zur Strukturaufklärung von amorphen Polymeren mit starren Polymerketten darstellen. Zu diesem Zweck wurden Celluloseacetate (CA) mit verschiedenen Substitutionsgraden (DS) hergestellt. Die Proben wurden durch IR-Spektroskopie, Differential-Scanning-Calorimetry (DSC) und dynamisch-mechanische Analyse (DMA) charakterisiert. Rasterelektronenmikroskopische Aufnahmen von gefriergebrochenen Oberflächen dieser Polymeren zeigten, daß außer lamellaren Strukturen auch kugelige Strukturen beobachtbar waren.
    Notes: In the present investigation an attempt has been made to throw light on the structure of stiff chain amorphous polymers. For this purpose cellulose acetates (CA) having different degrees of substitution (DS) were prepared. The samples were characterised by IR-spectroscopy, Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA). Scanning electron micrographs of the cryogenically fractured surfaces of these polymers showed that along with lamellar structures, nodular structures were also observable.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 136 (1985), S. 135-145 
    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: Mit Polyacrylnitril gepfropfte Stärke wurde aus Stärkegranulat von herkömmlicher Hirse (Penicum Miliaceum, L) hergestellt, und seine Verarbeitungsmöglichkeiten unter Verwendung des Brabender Plasticorders wurden untersucht. Glycerin als bekannter Weichmacher für Stärke ist als Weichmacher für dieses Polymere nicht geeignet. Eine Mischung von 1:1 Stärke : Stärkepfropfpolyacrylnitril und 25% Glycerin kann verarbeitet und zu einem Film extrudiert werden. Die Festigkeit des Films war geringer als die der reinen Stärke. Der Film, der aus dem Pfropfcopolymeren und mit Polymethylmethacrylat gepfropfter Stärke hergestellt war, hatte eine hohe Zugfestigkeit. Über die Daten der Fließaktivierungsenergie, die mit einem Torsionsrheometer erhalten wurden, wird ebenfalls berichtet.
    Notes: Starch-graft-polyacrylonitrile (S-g-PAN) has been prepared from granular starch of common millet (Penicum miliaceum, L) and its processibility has been examined using the Brabender Plasticorder. Glycerine, a known plasticizer for starch does not work as plasticizer for S-g-PAN. A mixture of 1 : 1 starch : S-g-PAN and 25% glycerine can be processed and a film can be extruded. The strength of the film was less than that of pure starch. The film prepared from the mixed graft copolymer of S-g-PAN and S-g-PMA had high tensile strength. The data on flow activation energy obtained from the torque-rheometer are also reported.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 150 (1987), S. 45-64 
    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 wurde das thermische Verhalten von 12 verschiedenen Stärken und ihren Pfropfcopolymeren mit Polyacrylnitril (PAN) aus dem nativen und gelierten Zustand mit Hilfe der Differentialkaloriemetrie (DSC) und der Rasterelektronenmikroskopie (REM) untersucht. Alle Stärken wiesen zwei endotherme Peaks bei etwa 65 und 260°C und einen exothermen Peak bei ca. 335°C auf. Das Pfropfcopolymere aus nativer Stärke zeigt einen schwachen endothermen Peak um 65°C und einen exothermen bei 300°C, während gelierte Stärke den charakteristischen exothermen Peak von Polyacrylnitril bei 250°C zusammen mit dem exothermen Peak des Propfproduktes bei 300°C aufweist. Um die endothermen Peaks der Stärke bei 65 und 265°C aufzuklären, wurden REM Untersuchungen durchgeführt. Der erste Peak läßt sich durch Dehydratation beim Erhitzen erklären, während der zweite dem Aufschmelzen von Kristalliten in der Stärke zuzuschreiben ist. Eine spezifische Eigenschaft der Hülsenfruchtstärken ist das Festhalten von Feuchtigkeit, selbst wenn sie im gelierten Zustand gepfropft wurden.
    Notes: Thermal behaviour of twelve different starches and their graft copolymers with polyacrylonitrile (PAN) from granular and gelatinized state, has been examined by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). All the starches exhibit two endotherms around 65 and 260°C and an exotherm around 335°C. The graft copolymer from granular starch shows a weak endotherm around 65°C and an exotherm around 300°C, while gelatinized starch exhibits the characteristic exotherm of PAN at about 250°C along with the exotherm of graft product at 300°C. Scanning electron microscopic studies were carried out to explain the endotherms of starch at 65°C and 265°C. The former one may be due to heat of dehydration while the latter one is attributed to the fusion of crystallites in the starch. Legumine starches seem to have a specific property of retaining moisture even if they are grafted in gelatinized state.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 47-67 
    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: Respropiophenon-Formaldehyd-Copolymere wurden durch Kondensation von 2,4-Dihydroxypropiophenon (Respropiophenon (RPP)) und Formaldehyd (F) in Gegenwart von NaOH oder H2SO4 als Katalysator mit unterschiedlichen molaren Anteilen der Monomeren hergestellt. Die Copolymeren wurden durch Elementaranalyse, IR-Spektroskopie, Viskositäts- und thermogravimetrische Untersuchungen charakterisiert. Ihr durchschnittliches Molekulargewicht wurde durch nichtwäßrige Leitfähigkeitstitrationen und Dampfdruckosmometrie bestimmt. Die Chelat-Ionenaustauscher-Eigenschaften wurden unter Anwendung der Batch-Gleichgewichtsmethod untersucht. Polychelate von Cu(II), Ni(II), Co(II), Mn(II), Zn(II), VO(II) und UO2(II) mit RPP-F-AI Copolymeren wurden horgestellt. Die analytischen Daten zeigen eine 1 : 2 Metall-Ligand-Stöchiometrie. Es wurden Elementaranalyse, magnetische, spektroskopische und thermische Eigenschaften der Polychelate ermittelt und mögliche Strukturen der Polychelate aufgezeigt. Alle Polychelate sind amorphe Pulver und unlöslich in den herkömmlichen organischen Lösungsmitteln.
    Notes: Respropiophenone-formaldehyde copolymers (RPP-F) were synthezised by the condensation of 2,4-dihydroxypropiophenone (respropiophenone (RPP)) and formaldehyde (F) in the presence of NaOH or H2SO4 as catalyst with varied molar ratios of reacting monomers. The copolymers were characterized by elemental analysis, IR spectra, viscosity, and TGA studies. Their M̄n was determined by nonaqueous conductometric titrations and vapour pressure osmometry (VPO). Chelation ion-exchange properties have also been studied employing the batch equilibration method. Polychelates of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), VO(II), and UO2(II) with RPP-F-AI copolymer were prepared. The analytical data agree with 1 : 2 metal-ligand stoichiometry. Elemental analysis, magnetic, spectral, and thermal properties of polychelates have been studied and probable structures are assigned to the polychelates. All the polychelates are amorphous powders, insoluble in common organic solvents.
    Additional Material: 8 Tab.
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 17 (1988), S. 181-185 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Pyrophyllite was heat treated up to 1000°C in the presence of fluxes such as Li2CO3, Na2CO3, K2CO3 and CaCO3 and the products were examined by scanning electron microscopy (SEM). It is shown that the surface morphology of the mineral varies with both temperature and flux. The dehydroxylation reaction in the mineral commences at 500°C and continues above 900°C. Dehydroxylated phases are observed even at 950-1000°C. The formation of free Al2O3, cristobalite, mullite and other phases from pyrophyllite was detected by the SEM examination.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 15-18 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: SEM micrographs showing porous structures and bonding of pores through broken mica flakes are presented. Pores of varying dimensions (10-400 μm) are formed. Interlayer spaces in mica are shown to be the preferential direction for heat and subsequently crack propagation during heat treatment for producing cellular insulating bricks at 900°C. The cracks end up with the formation of large pores in the presence of foaming agent and sodium silicate.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 215-218 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The surface structure of silicon carbide whiskers, produced from rice husk at 1500-1800°C, was examined by x-ray photoelectron spectroscopy. An ESCA survey scan of the surface showed Si, C, O and F to be present; Si in the form of SiCx and SiOx and C in the form of SiCx and CHx. On sputtering the sample, the SiOx and CHx species were reduced and the SiCx level increased. The photoelectron spectra are presented.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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