ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Chemistry  (18)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Effect of adjacent functional groups on the electron-donor-acceptor complex formation of diethyl 2,2-bis(dinitrobenzyl)malonates and 2,2-bis(4-dimethylaminobenzyl)malonate (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 739-748 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to study the effect of adjacent functional groups on electron-donor acceptor (EDA) complex formation, the following donor or acceptor compounds were synthesized: diethyl 2-(2,4-dinitrobenzyl)malonate (13), diethyl 2,2-bis(2,4-dinitrobenzyl)malonate (14), diethyl 2-(3,5-dinitrobenzyl)malonate (5), diethyl 2,2-bis(3,5-dinitrobenzyl)malonate (6), diethyl 2-(4-dimethylaminobenzyl)malonate (10), diethyl 2,2-bis(4-dimethylaminobenzyl)malonate (11). The acceptor compounds 5, 6, 13, and 14 were complexed with N,N-dimethyl-4-dimethylaminoaniline (1) as donor, and the donor compounds 10 and 11, with 1,3,5-trinitrobenzene (2) as acceptor. The wave length of the absorption maximum (λmax), the association constant (KCT), the enthalpy (δH), and entropy (δS) of these EDA complexes were determined. It was found that λmax of complexes 6-1 and 11-2 show a bathochromic shift compared with complexes 5-1 and 10-2, and the values of KCT, -δH, and -δS are higher. The value of λmax for complex 14-1 is not different from that of complex 13-1, and the values of KCT, -δH, and -δS are lower. It was concluded that the stability of the EDA complexes of the 2,2-dibenzylmalonate derivatives 6, 11, and 14, is influenced by π-electron interaction between the adjacent two benzene rings.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820304
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Molecular weight determination and fractionation of poly(L-histidine) by gel filtration (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2749-2757 
    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: Durch Gelfiltration an einem Dextrangel (Sephadex G-75) und kontinuierlicher Anzeige bei 212 nm durch ein UV-Spektrophotometer wurde Poly(L-histidin), Poly[imino-1-(4-imidazolylmethyl)-2-oxoäthylen], fraktioniert und das Molekulargewicht bestimmt. In gepufferter Lösung erfolgt bei pH 2,35 einwandfreie Elution, während bei einem pH von 5,4 Adsorption an das Gel erfolgt. Die Gewichts- und Zahlenmittel der Molekulargewichte (Mn und Mw) wurden aus einer Eichkurve für das Molekulargewicht, die mit Proteinen erhalten wurde, ermittelt und nach der Methode von Smith korrigiert. Bei einem Ausgangswert des unfraktionierten PLH für Mw/Mn von 1,43 hatten die mit einem Essigsäure/Ammoniumacetat-Puffer erhaltenen Fraktionen Polydispersitäten Mw/Mn zwischen 1,14 und 1,22.
    Notes: Dextran gel filtration (using Sephadex G-75 gel) with a continuous monitoring system was applied to the determination of the molecular weight and for fractionation of poly(L-histidine), poly[imino-1-(4-imidazolylmethyl)-2-oxoethylene], (PLH). PLH was eluted satisfactorily with a pH 2,35 buffer, whereas it was adsorbed to the gel with a pH 5,40 buffer. The weight-average and number-average molecular weights (Mw and Mn) were determined from the calibration plot of molecular weight, obtained with proteins, and corrected by the Smith method. A highly fractionated “monodisperse” PLH with Mw/Mn = 1,14 to 1,22 was obtained from PLH with Mw/Mn = 1,43 by the use of a pH 4,95 acetic acid/ammonium acetate buffer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770916
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Laccase-catalyzed polymerization of urushiol in precisely confined Japanese lacquer systemDedicated to Prof. Dr. H. Kämmerer on the occasion of his 65th birthday. (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 47-61 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Japanese lacquer is a sole, enzymatically drying natural lacquer, giving films with excellent durability. Oligomerization of urushiol (1) (a major component of the lacquer) in the lacquer system was reviewed. The enzymic formation of the urushiol-quinone (3) from urushiol was studied by laccase-catalyzed reactions with pyrocatechols. On the basis of the separated urushiol dimers in both the lacquer and model reaction systems, a nonenzymatic C—C and C—O coupling reaction of the urushiol-quinone with the unsaturated chain or with the nucleus of urushiol is discussed as significant reaction path in the polymerization of Japanes lacquer. The films of the lacquer made by a mild oxidation process, a technique applied for so long time in practice, retained their dynamechanical properties completely over 16 years.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Solvent effects on radical polymerization of cyclododecyl acrylate, 2Part 1. cf. 10.. Copolymerization (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2375-2391 
    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: Die radikalische Copolymerisation von Cyclododecylacrylat (CDA) mit Styrol (St) und mit Acrylnitril (AN) wurde bei 60°C untersucht und zwar sowohl für die Mischung der reinen Monomeren als auch für ihre Lösungen in Benzol, Tetrahydrofuran und Dioxan. Analoge Copolymerisationsversuche wurden zum Vergleich mit Cyclohexylacrylat (CHA) ausgeführt.Bei der Copolymerisation mit Styrol verhalten sich beide Acrylate sehr ähnlich dem Methylmethacrylat. Dabei wird die Reaktivität beider Acrylate durch die Effekte der verschiedenen Estergruppen und der Lösungsmittel in gleicher Weise beeinflußt wie bei ihrer Homopolymerisation.Dagegen wurden bei der Copolymerisation von CDA mit AN gegenüber dem CHA Besonderheiten gefunden. In benzolischer Lösung sind beide Copolymerisationsparameter r1 und r2 größer als 1 (M1 = AN, M2 = CDA; r1 = 1,7, r2 = 2,0) und durch charakteristische Assoziationserscheinungen beider Monomerer in Lösung gedeutet.
    Notes: The radical copolymerization of cyclododecyl acrylate (CDA) with styrene (St) or acrylonitrile (AN) was studied in bulk, benzene, tetrahydrofuran, or dioxane at 60°C, and was compared with that of cyclohexyl acrylate (CHA).In the copolymerization with St, the change in the ester groups or the used solvents influenced the reactivity of both acrylates in the same manner as their homopolymerization rates. Approximately, CDA and CHA behaved like methyl methacrylate in the copolymerization with St.Contrary, in the cases of copolymerization of CDA with AN, peculiar results were obtained and interpreted in terms of characteristic association states of the monomers in the solutions. In benzene solution both the monomer reactivity ratios, r1 and r2, are larger than unity (M1 = AN, M2 = CDA; r1 = 1,7, r2 = 2,0).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760815
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Solvent effects on radical polymerization of cyclododecyl acrylate, 1. Homopolymerization (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2359-2373 
    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: Die radikalische Homopolymerisation von Cyclododecylacrylat in Benzol, Tetrahydrofuran und Dioxan als Lösungsmittel wurde bei 60°C untersucht und mit der Polymerisation des Cyclohexylacrylates verglichen. Die beobachteten Differenzen der Polymerisationsgeschwindigkeiten beider Acrylate sind nicht mit den polaren und sterischen Substituentenkonstanten der Estergruppen in der Taft-Gleichung zu erklären. Darüber hinaus wurden auch bemerkenswerte Lösungsmitteleffekte bezüglich der Polymerisationsgeschwindigkeit gefunden und dem unterschiedlichen polaren Charakter der Lösungsmittel zugeschrieben.
    Notes: The radical homopolymerization of cyclododecyl acrylate at 60°C in benzene, tetrahydrofuran, or dioxane was studied and compared with that of cyclohexyl acrylate. The difference in the polymerization rates of the acrylates could not be interpreted in terms of the polar and steric substituent constants of ester groups in Taft's equation. Remarkable solvent effects on the polymerization rates for both acrylates were also found in the same manner and ascribed to the polar nature of the used solvents.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760814
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Chemical and physical behavior of phenolic resins in air-dried films of phenolic varnishes (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 2785-2797 
    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: Chemical and physical behavior of the oil soluble phenolic resins in phenolic varnish films were investigated by means of dynamic-mechanical measurement, infrared spectra, and M̄c measurement. The viscoelastic property of phenolic varnish films or increase in (Tg)d due to the addition of resin is the same regardless of the types of phenolic resin (oil-reactive or oil-nonreactive) employed, and despite the lower reactivity of the oil-nonreactive phenolic resin in the cooking stage. A reaction takes place between the oil-nonreactive phenolic resin and drying oil in the course of autoxidation and proceeds in aging, resulting in a network in which the phenolic resin is the backbone. Both the crosslinking and filling of resin were effective in increasing the (Tg)d of the films; crosslinking is the better method as it results in films having a smaller acetone-extractable portion.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090813
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Viscoelastic properties of epoxy resin. I. Effect of prepolymer structure on viscoelastic properties (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 2371-2380 
    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: The intermolecular cyclization reaction is investigated in highly crosslinked epoxy systems, where diepoxides with different mobilities between terminal epoxy groups were crosslinked with ethylene diamine. Based on the measured values of the Clash-Berg 10-sec modulus in the rubbery region, the correlation between the mobility and the cyclization reactivity of the diepoxides is discussed. The epoxide with higher mobility is found to have a higher rubbery modulus than that with lower mobility, as was expected. This is tentatively explained by the difference in the reactivity of the formation of the 11-membered ring. Dynamic mechanical measurements were also run on a forced vibration apparatus. The higher β-transition peak of the polymer of bisphenol-A diglycidyl ether was interpreted in terms of its higher free volume as well as lower density and lower glassy modulus. The higher modulus in the glassy region of ethylene glycol diglycidyl ether-ethylenediamine was explained on the basis of hydrogen bonding.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1971.070151005
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Viscoelastic properties of epoxy resins. II. Antiplasticization in highly crosslinked epoxy system (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2173-2181 
    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: The effect of the addition of certain low molecular weight compounds to highly crosslinked epoxy resins was investigated. The behavior which is known as antiplasticization, such as increases in modulus and yield strength and the elimination of β-transition, was observed in the highly crosslinked system as well as in the reported cases of thermoplastics - poly(vinyl chloride), bisphenol A polycarbonate, and polysulfone. Chlorinated biphenyl was found to be one of the most effective antiplasticizers examined in the present paper. However, the remarkable reduction in compressive strain at break and impact strength was not recognized for the highly antiplasticized samples. These phenomena have been interpreted on the basis of free volume concept.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170716
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Conducting polypeptide: Poly(L-histidinium 7,7,8,8-tetracyanoquinodimethanide) (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 2343-2350 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The TCNQ anion radical salt of poly(I-histidinium) with a 1:1 stoichiometry was prepared, which exhibited some degree of crystallinity. In the salt, the helical conformation of the polycation was preserved. It showed high electrical conducivity compared to certain salts with several imidazolium derivatives.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250903
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Physical properties of oxidative polymerized films prepared from polymerized oils, alkyd resins, and phenolic varnishes: Transition by dynamic-mechanical method and line-width measurement (NMR) (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 3519-3530 
    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: Glass transition temperatures of oxidative polymerized films were measured by the dynamic-mechanical method and by line-width measurements (NMR). The correlation was studied in relation to the chemical structure. The films investigated were polymerized linseed oil, alkyd resins, phenolic varnishes, and polyester-urethane films. It is found that the effects of chain stiffness and the degree of crosslinking predominate in Tg measured by the dynamic-mechanical method, whereas the effect of polar groups is most important on Tg measured by line-width measurement. It was previously reported that Tg as measured by the line-width measurement increased with the degree of crosslinking in vulcanized rubbers. This was not observed in films of phenolic varnishes, as the variation of the polar groups was involved. The meaning of Tg measured by different methods is also discussed from the thermodynamic standpoint.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070091102
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...