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  • 1
    Electronic Resource
    Electronic Resource
    Miscibility of bacterial poly(3-hydroxybutyrate) with cellulose esters (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 6441-6446 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00050a009
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization Kinetics and Morphology of Poly(3-hydroxybutyrate)/Cellulose Ester Blends (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 4755-4761 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00095a016
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  • 3
    Electronic Resource
    Electronic Resource
    Study of the crystal phase and crystallization rate of bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 1405-1410 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00031a008
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  • 4
    Electronic Resource
    Electronic Resource
    Plasticization of bacterial poly(3-hydroxybutyrate) (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 3304-3306 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00038a045
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of a low-molecular-weight plasticizer on the thermal and viscoelastic properties of miscible blends of bacterial poly(3-hydroxybutyrate) with cellulose acetate butyrate (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 6722-6726 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00077a005
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of crystallinity on the dynamic mechanical relaxations of poly(butylene isophthalate) (1989)
    Springer
    Polymer bulletin 21 (1989), S. 77-84 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The viscoelastic spectrum of poly(butylene isophthalate) annealed at 90 °C for different times has been examined by dynamic mechanical spectroscopy. Crystallinity affects both the main a absorption associated with the glass to rubber transition and the sub-ambient secondary β relaxation region. The latter results from two overlapping processes, β1 and β2, that have been evidentiated by a resolution procedure. Values of 52 and 76 kJ/mol have been obtained for the activation energies of the low (β1) and high (β2) temperature component respectively. It is suggested that these values are not affected by the methylene chain length and by the isomerism of the phthaloyl residue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00700272
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  • 7
    Electronic Resource
    Electronic Resource
    Crystallization kinetics and melting behavior of poly(butylene adipate), poly(butylene isophthalate) and their copolymers (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 2063-2070 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The melting behavior and the isothermal crystallization kinetics of poly(butylene adipate), poly(butylene isophthalate) and their random copolymers were investigated by means of differential scanning calorimetry. Multiple endotherms, commonly observed on the melting polyesters, were found to be influenced by crystallization temperature and composition. By applying the Hoffman-Weeks method to the isothermally crystallized samples, the equilibrium melting temperatures of the homopolymers were obtained. From calorimetric results on samples with different degree of crystallinity, the equilibrium melting enthalpy of poly(butylene isophthalate) was calculated and the presence of a crystal-amorphous interphase in copolymers was evidenced. Isothermal melt crystallization kinetics was analyzed according to the Avrami equation. As expected, the introduction of a comonomer was found to decrease the overall crystallization rate of the polymers. Values of Avrami exponent close to three were obtained for all the samples, independently of composition and crystallization temperature, in agreement with a crystallization process originating from predetermined nuclei and characterized by three-dimensional spherulitic growth. In the case of poly(butylene isophthalate), the dependence of the rate of crystallization on Tc shows a maximum at an undercooling of approximately 60°C.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 8
    Electronic Resource
    Electronic Resource
    Styrene/p-methoxystyrene random copolymers. Part III. Some remarks on dilute solution properties (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 164 (1973), S. 273-282 
    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: Statistische Copolymere aus Styrol und p-Methoxystyrol mit drei verschiedenen Zusammensetzungen und Poly(p-methoxystyrol) wurden durch Viskositätsmessungen in einigen Lösungsmitteln (gute und Θ-Lösungsmittel einbegriffen) bei verschiedenen Temperaturen untersucht.Die FLORYsche Konstante wurde unter Anwendung der üblichen Theorien berechnet. Die für die Copolymeren erhaltenen Werte stimmen mit den „idealen“ Werten nicht überein und sind unabhängig von der Temperatur.Die Messungen in Θ-Lösungsmitteln zeigen, daß sich die Konformationen der Copolymeren manchmal von der Konformation eines GAUSS-Knäuels unterscheiden.
    Notes: Styrene/p-methoxystyrene random copolymers of three different compositions and poly(p-methoxystyrene) have been examined by viscosity measurements in some solvents (including good and Θ solvents) at different temperatures.Current theories have been applied to evaluate the FLORY constant KΘ; the values obtained for the copolymers are quite different from the “ideal” values and are independent on the temperature.The measurements in Θ solvents suggest that the conformations of the copolymers differ sometimes from the GAUSSian coil conformation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021640125
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  • 9
    Electronic Resource
    Electronic Resource
    Partially aromatic polyamides: A calorimetric and dynamic-mechanical investigation (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 863-872 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Some partially aromatic polyamides were prepared from hexamethylenediamine and the following dicarboxylic acids: 4,4′-dimethyl-4,4′-p-phenylenedipentanoic acid, 3,3′-dimethyl-3,3′-p-phenylenedibutanoic acid, 3,3′-p-phenylenedibutanoic acid, and 3-methyl-3,3′-p-phenylenedipropanoic acid. From the dynamic-mechanical and thermal investigations it appears that the substitution of H-atoms with methyl groups adjacent to the phenylene ring very little affects the glass transition temperature of the polyamides, but seems to impede chain packing and thus lowering both melting points and crystallinity. The annealing below the glass transition temperature Tg was also explored. The development of endothermic peaks in the glass transition region is interpreted in terms of localized order.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021780321
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal behaviour of poly[imino(1-oxooctamethylene)], nylon 8 (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 1163-1171 
    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: Das thermische Verhalten von Nylon 8 wurde durch Differentialkalorimetrie (DSC) untersucht. Glasübergangstemperaturen (Tg) wurden im Molekulargewichtsbereich 1,7·103 - 3,4·104 gemessen, um eine Tg-Mn Abhängigkeit zu bestimmen. Eine kleine Verminderung der Tg-Werte wurde für die Proben mit den niedrigsten Molekulargewichten beobachtet: diese Proben wurden jedoch durch Polymerisation in Gegenwart eines Kettenabbruchreagenzes erhalten.Weiterhin wurde der Ursprung der mehrfachen Schmelzpeaks, die man während der DSC Analyse von unter verschiedenen Bedingungen kristallisierten Proben beobachtet, erforscht. Die Abhängigkeit des Schmelzverhaltens von der Aufheizgeschwindigkeit, der Abkühlungsgeschwindigkeit aus der Schmelze und von der isothermen Kristallisation bei verschiedenen Kristallisationstemperaturen (Tc) steht in Einklang mit der Hypothese eines Schmelz-Rekristallisationsprozesses während des Aufheizens.
    Notes: The thermal behaviour of nylon 8 was studied by differential scanning calorimetry (DSC). Glass transition temperatures (Tg) were measured over the molecular weight range 1,7·103 - 3,4·104 in order to determine a Tg-Mn dependence. A small decrease in the Tg values was observed for the lowest molecular weight samples which, however, were obtained by polymerization in presence of a chain terminator.The origin of multiple melting endotherms, found during DSC analysis of samples crystallized under different conditions, was also investigated. The effects of heating rate, of cooling rate from the melt, and of isothermal crystallization at various crystallization temperatures (Tc) on melting behaviour were consistent with the hypothesis of a meltrecrystallization process during heating.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760422
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