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  • 1
    Electronic Resource
    Electronic Resource
    Hochkristallines Polyäthylenterephthalat: Ordnung des polymerischen Materials und Entwicklung der Morphologie infolge Kristallisation (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 1126-1129 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Morphological characterization of highly cristalline PET has been carried out. Yarns were previously orientated by drawing under theTg or by industrial drawing, after that they were thoroughly annealed at a constant length. For the morphological characterization of the samples, X-ray diffractometric techniques, both high and low angle, and isothermal reverse gas-chromatography were used.
    Notes: Zusammenfassung Es wurde die Morphologie von PET-Proben untersucht, die infolge von längeren thermischen Behandlungen eine hohe Kristallinität aufwiesen. Die Ausgangsstoffe bestanden aus Filamenten, die vorher unterhalb derTg-Temperatur oder unter praxisnahen Bedingungen verstreckt und dadurch orientiert worden waren. Für die Charakterisierung wurden Kleinwinkel- und Weitwinkeldiffraktionsverfahren sowie das Verfahren der umgekehrten Gas-Chromatographie bei konstanter Temperatur angewendet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01382455
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and wheat straw fibre composites: thermal, mechanical properties and biodegradation behaviour (2000)
    Springer
    Journal of materials science 35 (2000), S. 829-836 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The thermal and mechanical behaviour of a biotechnological polyester (poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV) reinforced with wheat straw fibres has been investigated. In order to improve chemico-physical interactions between the components, the reinforcing agent has been previously submitted to a treatment with high temperature steam leading to fibres richer in cellulose and more reactive. The addition of straw fibres has been found to increase the rate of PHBV crystallisation, while it does not affect the crystallinity content. Furthermore, the comparison of the mechanical properties has shown that the composites exhibit higher Young moduli and lower values of both the stress (σB) and strain (∈B) to break than the neat matrix of PHBV. The biodegradability in different environments by means of short and long term tests has been studied. It has been observed that the presence of straw does not affect biodegradation rate evaluated in liquid environment and in long term soil burial tests. In the composting simulation test the rate of biodegradation is reduced for composites with more than 10% of straw content. The morphology of the composites has also been investigated and correlated to the biodegradation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004773603516
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  • 3
    Electronic Resource
    Electronic Resource
    Preoriented poly(ethylene terephthalate) yarns: Influence of the gauche-trans transformation on crystallization (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 21 (1983), S. 717-723 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Effects of macromolecular orientation on the crystallization of preoriented poly(ethylene terephthalate) filaments were studied. Infrared spectrophotometry and differential scanning calorimetry analyses showed that macromolecular segments in the trans conformation begin to crystallize below the glass transition temperature. Since filaments prepared by stretching at room temperature have different degrees of orientation, it is possible to evidence correlations between crystallization from an anisotropic matrix and the resulting morphology.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.180210504
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  • 4
    Electronic Resource
    Electronic Resource
    Dyeing behaviour and light fastness of poly(ethylene terephthalate) films: A correlation with the morphological structureDedicated to Professor Dr. Josef Schurz on the occasion of his 60th birthday (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 588-592 
    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: Isotrope Polyethylenterephthalat-Filme zeigten nach Temperung oberhalb 180°C eine Umkehr des Färbeverhaltens und der Lichtechtheit. Ähnliche Ergebnisse wurden mit anisotropen Filmen bei thermischer Behandlung oberhalb 150°C erhalten. Die morphologische Untersuchung der Filme zeigte, daß die Umkehr immer bei einem Kristallinitäts-index von etwa 0,5 auftritt, wobei in den anisotropen Proben jedoch größere Kristallite vorliegen. Die Erscheinung wird mit der Annahme interpretiert, daß die Farbstoffdiffusion durch den Wechsel vom üblichen Freien-Volumen-Modell zu einem Poren-Modell bestimmt wird.
    Notes: Isotropic poly(ethylene terephthalate) films, when thermally treated above 180°C, showed an inversion in dyeing behaviour as well as in light fastness. Similar results were found with anisotropic samples thermally treated above 150°C. The morphological characterization of the films showed the inversion points to occur always at a crystallinity index of about 0.5, but with larger crystallite dimensions in the anisotropic samples. The phenomenon is interpreted assuming that dye diffusion can be explained by replacing the usual “free volume” model by the “pore” model.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350904
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  • 5
    Electronic Resource
    Electronic Resource
    Poly(ethylene terephthalate): A comparison between inverse gas-chromatography and rate of solubilization in phenol (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 552-554 
    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: Die Morphologie von partiell-kristallinem PETP wurde mittels einer Ätztechnik und durch umgekehrte Gas-Chromatographie bei konstanter Temperatur untersucht. Durch Anwendung dieser zwei Techniken wurden gleiche Ergebnisse für teilkristalline, isotrope Proben gefunden, die nur von dem kristallinen Teil abhängen. Die umgekehrte Gas-Chromatographie bei konstanter Temperatur erlaubt eine Abschätzung der Orientierung der Makromolecüle, während die Ätztechnik für isotrope und anisotrope Proben das gleiche Verhalten zeigt.
    Notes: The morphology of semicrystalline polymeric materials(PETP) was studied by an etching technique and by isothermal inverse gas-chromatography. Using these two techniques the same results for semicrystalline isotropic materials were obtained and these results wer found to depend only on the crystalline fraction. Isothermal inverse gas-chromatography permits an evaluation of the macromolecular orientation while the etching technique shows the same behaviour both for isotropic and anisotropic materials.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320906
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    Paper (German National Licenses)
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