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  • Polymer and Materials Science  (10)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (6)
  • O15
  • 1990-1994  (12)
  • 1970-1974  (3)
  • 1965-1969  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Swelling characteristics of gel fractions of formaldehyde-modified cotton cellulosesPresented in part at the Spring Meeting of The Fiber Society at Williamsburg, Va., May 1966. (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 1777-1786 
    Details
    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: A method for assessing extent of swelling of the gel fraction of formaldehyde-modified cottons, employing cupriethylenediamine hydroxide as the swelling agent, is described. Substantial differences in apparent specific volumes of swollen gel fractions are observed for cottons crosslinked by different processes to the same level of agent. The apparent crosslink density measured by the swelling of gel fraction increases with formaldehyde content of the cotton; at 0.20% formaldehyde the order of increasing crosslink density in the various processes of reaction is as follows: nonaqueous system (forms D and D′) 〈 aqueous system (forms W and W′) 〈swelling system (form F) 〈 vapor system (form V) 〈 bake-cure system (form C).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070101115
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  • 2
    Electronic Resource
    Electronic Resource
    Direct observation of cell wall glucans in whole cells of Saccharomyces cerevisiae by magic-angle spinning 13C-nmr (1994)
    New York : Wiley-Blackwell
    Biopolymers 34 (1994), S. 1627-1635 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Intact cells of Saccharomyces cerevisiae were examined as an aqueous paste by 13C-nmr spectroscopy with direct polarization and magic-angle spinning. The spectra obtained were highly resolved, showing numerous resonances in the 60-105 ppm range that were assigned to carbons of a liquid-like domain of the cell wall glucan. Assignments were confirmed by running the spectrum of S. cerevisiae in which the cell wall glucans were labeled with [13C] by feeding the cell [13C ] galactose. The spectra indicate that the glucan in the cell wall of intact S. cerevisiae assumes a helical conformation and suggest that strain 17A fed with galactose preferentially incorporates the resulting glucose into β(1 → 3)-linkages. © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360341207
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of resorcinol-phenol-formaldehyde resins by NMR spectroscopy (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 26 (1972), S. 171-176 
    Details
    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 wird eine NMR-Methode zur Bestimmung der ungefähren Verhältnisse zwischen aus Phenolkernen, Resorcinkernen und Formaldehyd gebildeten Gruppenin Kondensationsprodukten aus Phenol, Resorcin und Formaldehyd beschrieben.
    Notes: A method is reported, based on NMR spectroscopy, for approximate determination of the component ratios of resins formed by condensation of resorcinol, phenol and formaldehyde.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050260113
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  • 4
    Electronic Resource
    Electronic Resource
    Paramagnetic shifts induced by europium and praseodymium chelates in the NMR spectrum of bisphenol a diglycidyl ether (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 27 (1972), S. 159-164 
    Details
    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 eine Voruntersuchung des Einflusses unternommen, den die Verschiebereagenzien Tris-(dipivaloylmethano)-europium uncl Tris-(dipivaloylmethano)-pra-seodym auf das NMR-Spektrum des Diglyzidyläthers des Bisphenol A ausüben. Es ergab sich, daß die Signale der am Epoxidring anliegenden Protonen durch den Zusatz dieser Chelate weit mehr als die Signale der exozyklischen -OCH2-Gruppen verschoben werden. Die Verschiebung kann man durch den Zusatz eines Alkohols rückgängig machen, der vorzugsweise mit dem Verschiebemittel reagiert.
    Notes: A preliminary study has been made of the effects of the shift reagents Eu (DPM)3 and Pr(DPM)3 on the NMR spectrum of Bisphenol A diglycidyl ether (I). Protons attached to the epoxy ring were observed to shift appreciably more than protons of the exocyclic —OCH2— group, on addition of these chelates. The shifts could be reversed by addition of an alcohol, which interacted preferentially with the shift reagent.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050270111
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  • 5
    Electronic Resource
    Electronic Resource
    Paramagnetic shifts induced by europium and praseodymium complexes in the NMR spectra of some substituted phenols (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 27 (1972), S. 151-157 
    Details
    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 wurden die Verschiebungen untersucht, die durch Tris-(dipivaloylmethano)-europium und Tris-(dipivaloylmethano)-praseodym im NMR- Spektrum versehiedener Derivate substituierter Phenole hervorgerufen werden. Der Zweck dieser Arbeiten war, die Möglichkeiten zu erfassen, die diese Verschiebereagenzien als Hilfsmittel in der NMR-Analyse von Phenolharzen bieten, und Information über Verschiebungen bei Molekülen zu gewinnen, die mehr als eine Koordinationsposition besitzen.
    Notes: An investigation into the shifts induced in the NMR spectra of some derivatives of substituted phenols by tris(dipivalomethanato)europium and tris(dipivalomethanato)praseodymium is reported. The phenol derivatives were studied to ascertain the possible utility of the shift reagents as an aid in the analysis of phenolformaldehyde resins by NMR spectroscopy, and to gain information on induced shifts with molecules having more than one possible co-ordination site.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050270110
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared spectroscopic investigations of unpoled poly(vinylidene fluoride) films in an electric field (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 319-322 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In Poly(vinylidenfluorid) (PVDF) kann die Dipoldrehung im elektrischen Feld anhand der Absorptionsänderung der Infrarotbanden bei 445 cm-1 und 510 cm-1 verfolgt werden. Anknüpfend an vorhergehende Untersuchungen wurde an PVDF-Folien mit aufgedampften infrarotdurchlässigen Elektroden ein stufenweise erhöhtes Feld angelegt und das Infrarotspektrum aufgenommen. In Anlehnung an das früher entwickelte Modell wurden die normierten Absorptionen der beiden Banden gegeneinander aufgetragen, wobei sich eine Abweichung vom erwarteten linearen Zusammenhang in der Feldabhängigkeit der Absorption beider Banden zeigte. Interpretiert wird diese Abweichung mit der feldinduzierten Zunahme des Anteils langer Trans-Sequenzen.
    Notes: In poly(vinylidene fluoride) (PVDF) the rotation of the dipoles in an electric field can be followed by the change of the infrared absorption bands at 445 cm-1 and 510 cm-1. Referring to preceding measurements on PVDF foils with evaporated infrared transparent electrodes a stepwise increased field was applied. Following the formerly developed model, the normalized absorptions of both bands were plotted one against the other. A deviation from the expected linear relation in the field dependence of both absorption bands was found. This behaviour is interpreted by an increase of the amount of long trans sequences.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420707
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  • 7
    Electronic Resource
    Electronic Resource
    Internal stresses, dimensional instabilities arid molecular orientations in plastics. Von L. C. E. STRUIK. ISBN 0-471-92642-6. Chichester/New York/Brisbane/Toronto/Singapore: .John Wiley & Sons, 1990. XVII, 453 S., geb., £ 45.00. (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 136-136 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420225
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  • 8
    Electronic Resource
    Electronic Resource
    Infrared spectroscopic study of field-induced band shifts and dipole orientation in poly(vinylidene fluoride) (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 1-7 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Uniaxial gereckte, in der ß-Modifikation vorliegende PVDF-Filme wurden bei anliegendem elektrischen Feld infrarotspektroskopisch untersucht. In bis zu 13 Feldstärkecyclen wurden dabei sowohl die Feldstärke als auch die Richtung des anliegenden Feldes variiert. Die feldinduzierten Frequenzänderungen der Banden bei 445 cm-1 (CF2-rocking) und 510 cm-1 (CF2-bending) wurden detailliert registriert. Modellrechnungen zum Einfluß des Feldes auf die Schwingungsfrequenzen demonstrieren die Möglichkeit, mit Hilfe der Infrarotspektroskopie zwischen entgegengesetzten Dipolrichtungen zu unterscheiden. Die experimentellen Ergebnisse deuten auf die Existenz eines remanenten Feldes in der Probe infolge der Einwirkung des äßeren Feldes hin.
    Notes: Infrared spectra of uniaxially drawn ß-PVDF films under the influence of an electric field were registered. The direction and the strength of the applied field were changed in up to 13 cycles. The field-induced frequency changes of the bands at 445 cm-1 (CF2-rocking) and 510 cm-1 (CF2-bending) were studied in detail. Model calculations concerning the influence of the field on band frequencies are presented revealing the possibility to discriminate by IR spectroscopy between opposite dipole directions. The experimental results suggest the formation of a remanent field in the samples during poling.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430101
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  • 9
    Electronic Resource
    Electronic Resource
    The Phenomenological theory of linear viscoelastic behavior. An introduction. Von NICHOLAS W. TSCHOEGL. ISBN 3-540-19173-9. Berlin/Heidelbere/New York/London/Paris/Tokyo/Hong Kong: Springer-Verlag 1989. XXV, 769 S., geb., DM 148,00. (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 425-425 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410711
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  • 10
    Electronic Resource
    Electronic Resource
    Zum einfluß von düsenverzug und plastischer reckung auf die eigenschaften von naßgesponnenen polyoxadiazolfäden (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 159-164 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The aromatic heterocyclic polymer polyoxadiazole is of interest for special applications because of its high thermal stability. Using a laboratory equipment the spinning parameters jet draw rate and plastic drawing have been varied. The effect of spinning conditions on the material parameters elongation at break, tenacity and modulus was investigated. To achieve higher values of tenacity and modulus, a jet draw rate of 2 and plastic drawing ratio of 1.5 to 2.0 were found to be optimal. Also the increase of fibre length at stress-free heating has been studied. With varying jet draw rate and plastic drawing ratio both positive and negative changes of fibre length have been observed. The results are explained by superposition of spontaneous extension and shrinkage.
    Notes: Polyoxadiazol, ein aromatisches heterocyclisches Polymer, ist aufgrund seiner hohen thermischen Stabilität für eine Reihe von Einsatzzwecken interessant. Mit einer Laborspinnanlage wurden die Spinnbedingungen Düsenverzug und Grad der plastischen Reckung variiert und deren Einfluß auf die Materialparameter wie Bruchdehnung, Festigkeit und Modul untersucht. Zur Erreichung höherer Festigkeiten und Moduli erwiesen sich ein mittlerer Düsenverzug von 2 und ein eher niedriger plastischer Reckgrad von 1,5 bis 2 als günstig. Ebenfalls untersucht wurde die Längenzunahme der Fäden bei lastfreier Temperung. Je nach Düsenverzug und plastischem Reckgrad wurden sowohl positive als auch negative Längenänderungen gefunden, die mit der überlagerung von spontaner Dehnung und Schrumpf erklärt werden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430306
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