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  • 1
    Electronic Resource
    Electronic Resource
    Problems connected with the evaluation of the perfection of polymer crystalline structure with poly(ethylene terephthalate) as an example (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 590-592 
    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: Die Perfektion der kristallinen Struktur von PETP-Fasern wurde nach zwei verschiedenen Röntgenmethoden beurteilt. Die nach der von Ruland vorgeschlagenen Methode erhaltenen Werte des Perfektionsindex der kristallinen Struktur wurden mit Parametern korreliert, die die Faltung in den Oberflächenschichten der Kristallite charakterisieren, insbesondere mit der freien Energie dieser Schichten. Auf Basis der gefundenen Korrelation wurde geschlußfolgert, daß der Wert des Perfektionsindex von der Ordnung der Makromoleküle in den gefalteten Oberflächen der Kristallite abhängt.
    Notes: The perfection of the crystalline structure of PETP fibres was evaluated by means of two different X-ray methods. The values of the perfection index of the crystalline structure obtained with the method proposed by Ruland were correlated with the parameters characterizing the fold surface layers of the crystallites, particularly with the free energy of these layers. On the basis of the found correlation, the conclusion was drawn that the value of the perfection index depends on the order of the macromolecules within the fold surface layers of the crystallites.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411110
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  • 2
    Electronic Resource
    Electronic Resource
    The structural effects of cold crystallization of poly(ethylene terephthalate) (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 5-7 
    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: Poly(ethylenterephthalat)-Fasern mit unterschiedlichem Reckverhältnis wurden untersucht. Aus dem DSC-Thermogramm wurden die Parameter der Kaltkristallisation bestimmt. Die charakteristischen Parameter der übermolekularen Struktur wurden durch Röntgenbeugung ermittelt. Auf Basis geeigneter linearer Regressionsbeziehungen wurde festgestellt, daß die Kaltkristallisation in den Flatungsoberflächen der Kristallite erfolgt. Die Kaltkristallisation führt zu änderungen der molekularen Ordnung in den Oberflächenschichten. Richtung und Größe dieser Änderungen bestimmen die Temperature, bei der das Schmelzen der Probe einsetzt.
    Notes: Poly(ethylene terephthalate) fibres of different drawing ratio were investigated. The parameters of cold crystallization were determined from the DSC thermograms. The parameters of the supermolecular structure of the samples were determined by X-ray technique. On the base of the suitable linear regression relations it was stated that cold crystallization occurs within the fold surface layers of the crystallites. The effects of cold crystallization are changes of the molecular order within the surface layers. Direction and magnitude of these changes decide the initial melting temperature of the sample.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420102
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of crystallinity in polycaproamide fibers by the method of half-integral intensity (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 793-797 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rectilinear relationship between the integral intensity Bi and fiber density d is used as the basis of a new method for evaluation of the crystallinity index of polyamide fibers (PA-6). To calculate the value of the crystallinity index of the fibers one should have the integral intensity value of the sample and the integral intensities of crystalline and amorphous samples determined under defined instrumental conditions. The method provides a quick and simple means for determining the crystallinity. The method of half-integral intensity may be used only with care when the α-monoclinic polymorphic form dominates in the PA-6 fiber.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170120409
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  • 4
    Electronic Resource
    Electronic Resource
    The structural interpretation of DSC curve specificity of poly(caprolactam) fibers. I. The specificity of the element of the curve observed in the temperature range ∼40-65°CCorrected proofs received December 28, 1982 (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1025-1032 
    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 index τ determined from the thermogram was correlated with the selected parameters of the amorphous material structure of polycaprolactam fibers. The investigated structural parameters were as follows: (a) the orientation factor determined by infrared absorption spectroscopy, based on the absorption band at 1130 cm-1; (b) the fraction of taut tie molecules calculated on the basis of the determined axial elastic modulus and volume crystallinity of the fiber. The occurrence of straight-line relations between the values of the index τ and the values of the investigated structural parameters was found out. The conclusion was formulated that the specificity of the investigated element of the DSC curve reflects the entropy transition rate. That transition, stimulated by fiber heating during the DSC experiment, consists of the increase of the disorder of taut tie molecules. Probably, the rate of that transition changes relatively to the magnitude of the stress affecting taut tie molecules.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280310
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  • 5
    Electronic Resource
    Electronic Resource
    Studies upon the fine structure and selected physical and physicochemical properties of butrylchitin membranes (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 54 (1994), S. 1469-1482 
    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 varying the molecular weight of butyrylchitin membranes cast from methylene chloride on their properties has been investigated. Characterization analyses include X-ray, scanning calorimetry and tensile stress-strain. The crystal structure of the butyrylchitin was shown to consist of fringed micelles, irrespective of the molecular weights examined, and of lower crystal volume fraction than usually found for chitin membranes, 0.3 versus 0.5, respectively. The membranes exhibit greater ductility and less swelling in physiological salt solution with increasing molecular weight. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070541011
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanism of the appearance of the mobile peak on the thermograms of poly(ethylene terephthalate) fibres (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 237-240 
    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: Eine Hypothese zur Erklärung des endothermen Peaks auf den Thermogrammen von PETP-Fasern im Bereich zwischen Glastemperatur und Schmelztemperatur wird vorgeschlagen. Nach dieser Hypothese spiegelt der mobile Peak das Aufschmelzen von kleinen geordneten Bereichen wider, die in den durch Kettenfaltung gebildeten Oberflächen der kristallinen Blöcke gelegen sind. Diese geordenten Bereiche entstehen in den irregulären Rückfaltungen benachbarter Ketten im Ergebnis der Kaltkristallisation während der DSC-Messung.
    Notes: A hypothesis concerning the appearance of the endothermic peak of PETP fibre thermogram in the range above glass temperature but below melting temperature is presented. According to this hypothesis, the mobile peak reflects melting of ordered small regions located in the fold surfaces layers of crystalline blocks. These ordered regions result from cold cystallization during the DSC measurement in irregular adjacent reentry folds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370414
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  • 7
    Electronic Resource
    Electronic Resource
    The structural interpretation of DSC curve specificity of poly(ethylene terephthalate) fibres in the temperature range from 30 to 85 °C (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 137-141 
    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: Zwei Parameter, die zwei Elemente der DSC-Kurve im Temperaturbereich von 30 bis 85°C charakterisieren, wurden mit Strukturparametern des amorphen Materials korreliert. Auf dieser Basis konnte die Schlußfolgerung abgeleitet werden, daß das erste Element das DSC-Bild eines Übergangs ist, der in der Orientierungsänderung der gespannten Verbindungsmoleküle (taut tie molecules) besteht. Das zweite Element, ein endothermer Peak, spiegelt den Bruch von Bindungen in dem amorphen Material wider, das sich zwischen den Substruktureinheiten der Fibrillen befindet.
    Notes: Two parameters, which characterize the two elements of the DSC curve in the temperature range 30 to 85°C, were correlated with structural parameters of the amorphous material. From the results it was concluded that the first element of the DSC image reflects the transition consisting in the change of the orientation of taut tie molecules. The second element, an endothermic peak, reflects the breaking of the bonds in the amorphous material located between the substructural units of the fibrils.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370302
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