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  • Polymer and Materials Science  (685)
  • 1980-1984  (642)
  • 1950-1954  (43)
  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the phase equilibrium and interaction mechanism of cardopolyimides with antimony trichloride (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 727-731 
    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: Es wird die Phasentrennung der Lösungen von Cardopolypyromellithimiden und -polynaphthylimiden mit Fluoren-, Phthalid- und Anthronseitengruppen in geschmolzenem Antimontrichloid untersucht. Dabei wird gefunden, daß die Polypyromellithimide mit Fluoren- und Phthalidseitengruppen sowie das Polynaphthylimid des Anilinphthaleins bei der Phasentrennung der Lösungen kristallisieren. Schließlich werden die Struktur der aus den Lösungen erhaltenen Polymere und der Mechanismus der Wechselwirkung zwischen den Polyimiden und dem Antimontrichloid betrachtet.
    Notes: Phase separation of solutions of cardo poly(pyromellitic imide)s and poly(naphtholylene imide)s with fluorene, phthalide and anthrone groups in melted SbCl3 is investigated. It is shown that poly(pyromellitic imide)s with fluorene and phthalide side groups are crystallized during phase separation of corresponding solutions. The structure of polymers obtained from solutions and the mechanism of polymide-SbCl3 interaction are studied.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010311201
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  • 2
    Electronic Resource
    Electronic Resource
    Microphase state of oligobutadienediol-based polyurethaneureasCorrected proofs received March 26, 1984 (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 1919-1927 
    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: Structural studies of oligobutadienediol-based polyurethanes with various degrees of crosslinking were carried out. From absolute small-angle X-ray scattering, the degree of segregation of components was determined. It was concluded that a complete microphase separation of the different components is realized in all samples irrespective of the degree of crosslinking, and these polymers are two-phase systems. While stretching, the fibrillar structure is formed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290601
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic studies of structure formation during anionic adiabatic polymerization of ε-caprolactam (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 1523-1532 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of crystallization and structure formation of polycaproamide (PCA) during anionic adiabatic polymerization of ε-caprolactam was studied. The adiabatic crystallization was shown to comprise three successive stages. In the first stage PCA forms dendritelike structures, the space between which is filled with the monomer. In the second stage rather rapid crystallization proceeds to give large loose spherulites. The dendritic structures serve as nuclei for development of spherulites. In the third stage slow secondary crystallization occurs. It is accomplished by crystallization of the residual amorphous substance located both in the dendritic nucleus and throughout the volume of the spherulites. This process is followed by the partial disappearance of the dendritic nuclei and by thickening of lamellae, which results in a substantial densification of initial structures and appearance of fine spherulites. As a result, a fine spherulitic structure with 50% crystallinity is formed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180180704
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  • 4
    Electronic Resource
    Electronic Resource
    Crystallization of alkyl-aromatic polyimides (polyalkanimides) (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 247-263 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polyalkane imides based on 3,3′,4,4′-diphenyloxidetetracarboxylic, pyromellitic and 1,4,5,8-naphthalenetetracaboxylic acids, and aliphatic diamines containing 4, 6, 8, 10, or 12 methylene groups have been studied. Relations governing the effect of structure on solubility, heat resistance, density, and crystallizability have been established. Conformation analysis has been carried out and models of the macromolecules have been constructed. The morphology of the crystalline polymers has been studied. For the polymers of the given class, crystallization capability is shown to be associated with the conformational flexibility of the macromolecular unit determining a given acid moiety by the number of methylene groups in the diamine unit.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180180208
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  • 5
    Electronic Resource
    Electronic Resource
    A study of structure formation processes occurring with the gelation of polysulfonamide solution in dimethylacetamideProofs received from author March 12, 1981 (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 1197-1202 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This work investigates spontaneous gelatination of polysulfonamide in the solution of dimethylacetamide by nuclear magnetic relaxation, small-angle light scattering, and refractive index measurement. Two stages of the gelatination process were found to occur. Spherulites are formed in the first stage while the mobility of the solvent molecules decreases sharply. The second stage is characterized mainly by perfection of the inside structure of spherulites without a change in their size. The degree of decreasing mobility of the solvent molecules is much less in this stage than in the first stage.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170190515
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  • 6
    Electronic Resource
    Electronic Resource
    The active centres in the anionically activated polymerization of ε-caprolactam (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 31-35 
    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: Conductometric investigations with solutions of Na-ε-caprolactam (catalyst of the activated anionic polymerization) in the caprolactam melt in the presence of N-acetyl-ε-caprolactam, dibenzo-18-crown-6 and sodium tetraphenyl borate are described. Based on conductometric and kinetic results the activated anionic polymerization of ε-caprolactam is shown to proceed at free anions as well as at ion pairs. The possibility of the polymerization of the monomer by the ionic coordination mechanism is considered.
    Notes: Konduktometrische Untersuchungen an Lösungen des Na-ε-caprolactams (eines Katalysators der aktivierten anionischen Polmerisation) in der Caprolactamschmelze in Gegenwart von N-Acetyl-ε-caprolactam, Dibenzo-18-crown-6 und Natriumtetraphenylborat werden beschrieben. Anhand der konduktometrischen und kinetischen Untersuchungen wird gezeigt, daß die aktivierte anionische Polymerisation von ε-Caprolactam sowohl an freien Anionen als auch an Ionenpaaren verläuft. Die Möglichkeit der Polymerisation des Monomers nach dem ionischen Koordinationsmechanismus wird betrachtet.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320108
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  • 7
    Electronic Resource
    Electronic Resource
    Changes of the phase structure of systems consisting of epoxy resins and monoepoxyesters of fatty acids during curing (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 659-662 
    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: Mittels Elektronenmikroskopie und optischer Interferometrie wurde die Verträglichkeit von Epoxidharz mit reaktionsfähigen Modifikatoren in verschiedenen Härtestadien untersucht. Während des Härtens erfolgt teilweise ein Einbau der Modifikatormoleküle in die Netzstruktur des Epoxidharzes, teilweise aber auch ihre Abscheidung in eine gesonderte Phase. Die Verteilung des Modifikators zwischen den Phasen hängt von seinem chemischen Bau und seiner Molmasse ab.
    Notes: The compatibility of epoxy resin with reactive modifiers was investigated in various stages of curing by electron microscopy and optical interferometry. During the curing process the modifier molecules are partially incorporated into the network structure of the epoxy resin and partially segregated to form an individual phase. The distribution of the modifier between these phases depends on the chemical structure and the molecular weight of the modifier.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010351010
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  • 8
    Electronic Resource
    Electronic Resource
    Supermolecular organization of some polyurethanes containing sugar derivatives in the main chain (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 129-136 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: X-ray studies on polyurethanes containing sugar derivatives in the main chain were performed. It was demonstrated that the microphase separation of rigid and flexible fragments was dependent on the nature of sugar derivatives. The supermolecular organization in disaccharide-based polymers is the most ordered one. In xylose- and arabinose-based polyurethanes the phase separation is defined least of all. Glucose- and dulcitol-based polymers are intermediates as to their supermolecular organization. Supermolecular organization models for block copolyurethanes under investigation were proposed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180203
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  • 9
    Electronic Resource
    Electronic Resource
    On the principle of equal reactivity in solution polycondensation (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 105-111 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The influence of the degree of polymerization of oligomers (1 ≤ l ≤ 50) on the reactivity of the OH endgroups is exemplified by the reaction of oligoterephthalates of phenolphthalein with benzoyl chloride under ϑ-conditions. It is found that with increasing chain length l the hydroxyl group activity increases according to an S-form law. It is suggested that the ester groups of the macromolecule influence the activity of the OH endgroups due to solvation effects. This suggestion is confirmed theoretically and experimentally.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840111
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  • 10
    Electronic Resource
    Electronic Resource
    Slow relaxational processes in the melting of linear biopolymers: A theory and its application to nucleic acids (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 39-58 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We treat the problem of the mean time of complete separation of complementary chains of a duplex containing N base pairs. A combination of analytical and computer methods is used to obtain the exact solution in the form of a compact expression. This expression is used to analyze the limits of application of the equilibrium theory of helix-coil transition in oligo- and polynucleotides. It also allows the melting behavior of a biopolymer to be predicted when its melting is nonequilibrium. In the case of oligonucleotides for which the equilibrium melting takes place at a high value of the stability constant s, the general expression turns into the equation of Craig, Crothers, and Doty, used by them to determine the rate constant kf of the growth of a helical region from temperature-jump experiments. For the case of fragmented DNA with N ∼ 102, the melting process is shown to be completely nonequilibrium, and as a result, the observed melting temperature should be higher than that for the equilibrium. A simple equation is obtained that makes possible calculation of the real, “kinetic” melting temperature Tk. As N increases, the observed melting temperature should approach the equilibrium value, Tm. This analysis has explained quantitatively the peculiar chain-length dependence of the experimentally observed shift in the DNA melting temperature during fragmentation. A thorough analysis is given of the nonequilibrium effects in the melting process of long DNA molecules (N ≳ 103). The main conclusion is that even in the presence of profound hysteresis phenomena, the melting profile observed on heating may differ only slightly from the equilibrium profile.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360230105
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