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  • Chemistry  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Synthese und eigenschaften einiger höhergliedriger cyclischer ätheracetale (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 3191-3195 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Optimized syntheses of 1,3,6,9-tetraoxacycloundecane (2), 1,3,6,9,12-pentaoxacylotetradecane (3), and 1,3,6,9,12,14,17,20-octaoxacyclodocosane (4) as well as some physical and chemical properties and the proof of structure are reported.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021781202
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  • 2
    Electronic Resource
    Electronic Resource
    Werner Kern zu seinem 70. Geburtstag (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 1639-1641 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: No. Abstract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770601
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  • 3
    Electronic Resource
    Electronic Resource
    1 3C-NMR-Spektroskopie an Polyäthern (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 450-450 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19740861216
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  • 4
    Electronic Resource
    Electronic Resource
    Polymere mit atropisomeren Biphenyl-Grundbausteinen (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 422-422 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19670790936
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  • 5
    Electronic Resource
    Electronic Resource
    Synthetische makromolekulare Stoffe mit reaktiven Gruppen (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 69 (1957), S. 153-171 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird über Synthese, Eigenschaften und Reaktionen einiger makromolekularer Stoffe mit reaktiven Gruppen berichtet, und zwar über Derivate der Polyacrylsäure (Polyacrylsäure-hydrazid, Polyacrylhydroxamsäure, Polyacrylsäureamid), des Polyvinylalkohols, über Polyacrolein und Polymethacrolein, Polyvinylsulfonsäure und ihre Derivate sowie über Copolymere aus Styrol und Maleinsäureanhydrid. An den reaktiven Gruppen dieser polymeren Stoffe werden chemische Reaktionen ausgeführt. Dabei zeigt sich, daß unter Bedingungen, die dem makromolekularen Bau des Reaktionspartners angepaßt sind, eine Reihe von Reaktionen, die aus der niedermolekularen Chemie gut bekannt sind, auf solche Polymere übertragen werden können. Dadurch werden neue makromolekulare Stoffe zugänglich, die durch Polymerisation oder Polykondensation nicht zu erhalten sind.
    Additional Material: 10 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19570690502
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  • 6
    Electronic Resource
    Electronic Resource
    Neuere Untersuchungen über optisch aktive Polymere (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 280-280 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19670790621
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  • 7
    Electronic Resource
    Electronic Resource
    Conformation of amylose in aqueous solution: Optical rotatory dispersion and circular dichroism of amylose-iodine complexes and dependence on chain length of retrogradation of amylose (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 243-261 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dependence on chain length of two characteristic properties of amylose, i.e., retrogradation and complex formation with iodine, have been studied by using enzymatically synthesized, homodisperse amyloses. The association rates of amyloses in water containing 5% dimethyl sulfoxide have a sharp maximum at a degree of polymerization P̄n of 80; shorter and longer molecules are much more soluble. The iodine complexes of amylose exhibit a strong Cotton effect in the range of the long-wave absorption maximum (position depending on chain length) and two weaker Cotton effects at 480 and 350 nm. The long-wave Cotton effect is most intense at about P̄n 50 and decreases rapidly for shorter and longer chains. This behavior is unexpected and is not in accordance with the further increase of λmax and λmax. The experiments can best be interpreted by assuming well ordered, stiff chains in the low molecular weight range (P̄n 50-80). For longer chains, the findings are discussed in the light of current concepts of amylose conformation in aqueous solution, namely the model of the broken helical chain (alternating stiff helical segments and unordered regions) and the model of a flexible coil without a significant helical content. However, according to the results given in this paper, a wormlike helical chain seems to be the most adequate model for amylose conformation in neutral solution.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360100203
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  • 8
    Electronic Resource
    Electronic Resource
    Macromolecules with groups of high reactivity (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 48 (1960), S. 91-99 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Reactions on the reactive groups of macromolecular substances (e.g., cellulose) have long been known, even since before the structures of macromolecules were understood. H. Staudinger carried out numerous reactions with macromolecules, maintaining the degree of polymerization constant, in order to substantiate the macromolecular structure of the substances investigated (polymeric-analogous reactions). During the last fifteen years reactions with macromolecules have been investigated because it was desirable to compare the chemical diversity of low molecular weight compounds with the corresponding chemical diversity of macromolecular compounds. These endeavors bring forth materials which supplement the numerous macromolecular substances which are produced and used as materials for plastics, and therefore these materials should have as low reactivity and high stability as possible. Objectives are given for the preparation of macromolecules with a large variety of groups. From these objectives it is evident that, as in low molecular weight chemistry, macromolecular substances which possess functional groups of high reactivity are suitable as starting materials. Some of these which have been known for a long time but have been investigated only in recent years are polyaldehydes (polyacroleins and polymethylacroleins), polyacyl halides such as polyacryl chlorides and polyvinylsulfonyl chlorides and fluorides, and, most recently, polymeric organometallic compounds such as poly-p-lithiumstyrene. The reactions with these macromolecules are described and the properties of the resulting new polymeric substances are given.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204815010
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  • 9
    Electronic Resource
    Electronic Resource
    Optische rotationsdispersion und circulardichroism us der jodkomplexe niedermolekularer amylosen in abhängigkeit vom polymerisationsgrad. 4. Mitteilung3. Mitt., R. C. SCHULZ, R. WOLF und H. MAYERHÖFER, Kolloid-Z. u. Z. Polymere 227 (1968) 65.Frau Professor Dr. E. HUSEMANN mit freundlichen Grüßen zum 60. Geburtstag gewidmet (1969)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 121 (1969), S. 147-158 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: From a series of enzymatically synthesized amyloses with a very narrow molecular weight distribution (Pw/Pn = 1.001-1.002) and degrees of polymerization (Pn) between 25 and 480 the iodine complexes were prepared. The absorption spectra as well as the ORD- and CD-curves of these complexes were recorded. COTTON effects were observed at 365, 485 and in the range of 500-600 mμ. The wavelength of the absorption maximum (λmax) of greatest wavelength and of the positive CD-maximum in the region of 500-600 mμ may be described as functions of Pn by the equation : \documentclass{article}\pagestyle{empty}\begin{document}$$\frac{1}{{\lambda _{\max } }} = \frac{1}{{\rm A}} + \frac{{\rm B}}{{\rm A}} \cdot \frac{1}{{{\rm P}_{\rm n} }} $$\end{document} Furthermore, the extinctions, the base molar rotations and dichroic absorptions have been evaluated as a function of Pn. The base molar rotations and the CD-absorptions exhibited a maximum between Pn 70 to 100 and decreased again at higher Pn. ORD and CD increased on standing of the solutions, whereas the locations of the absorption maxima as well as of the COTTON affects remained unchanged. Possible reasons for this behaviour are discussed.
    Notes: Von einer Reihe enzymatisch synthetisierter Amylosen mit sehr enger Molekulargewichtsverteilung (Pw/Pn = 1,00 bis 1,002) und Polymerisationsgraden (Pn) zwischen 25 und 480 wurden die Jodkomplexe hergestellt. Die Absorptionsspektren sowie die ORD-und CD-Kurven dieser Jodkomplexe wurden aufgenommen. Es treten COTTON-Effeket auf bei 365, 485 und im Bereich von 500-600 mμ. Die Wellenlänge des langwelligen Absorptionsmaximums (λmax) sowie des positiven CD-Maximums als Funktion von Pn lassen sich durch folgende Gleichung beschreiben: \documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{1}{{\lambda _{\max } }} = \frac{1}{{\rm A}} + \frac{{\rm B}}{{\rm A}} \cdot \frac{1}{{{\rm P}_{\rm n} }} $$\end{document} Ferner wurden die Extinktionen, die grundmolaren Drehwerte und die CD-Absorptionen als Funktion von Pn untersucht. Drehwerte und CD-Absorption durchlaufen zwischen Pn 70 und 100 maximale Werte und sinken bei höherem pn wieder ab. Sowohl ORD als auch CD nehmen im Laufe der Zeit zu, obwohl die Extinktionen und die Lage der Absorptionsmaxima und der COTTON-Effekte unverändert bleiben. Mögliche Ursachen werden diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1969.021210113
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  • 10
    Electronic Resource
    Electronic Resource
    Recent Studies of Optically Active Polymers (1967)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 6 (1967), S. 271-271 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196702712
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