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  • Polymer and Materials Science  (8)
  • 1975-1979  (4)
  • 1970-1974  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Properties of blends of poly(ethylene oxide) samples with different molecular weight: Kinetics of crystallization from melt (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 219-228 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crystallization kinetics of binary blends of samples of poly(ethylene oxide) with different molecular weights, namely 2000, 20 000, and 197000 has been investigated by means of polarized light microscopy in order to establish the dependence of the kinetic parameters upon the composition. The temperature and composition dependence of the growth rates of spherulites in thin films of supercooled melt has been analyzed by means of the theoretical expressions given by Hoffman and Lauritzen. The experimental results indicate that some kinetic and thermodynamic quantities such as the rate of crystallization, the equilibrium melting temperature, the free energy of formation of a nucleus of critical size, and the surface free energy of folding are strongly dependent upon the composition of the blends.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1979.021800121
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of solution grown crystals of aliphatic polyesters with variable amount of double bonds along the chain (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 1023-1035 
    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 elucidate the relations between morphological habits, thermal behaviour and chemical structure of polymers, aliphatic polyesters with variable amount of trans-double bonds along the backbone chain were crystallized from dilute solutions in 1-propanol and 1-butanol. The crystals were studied with electron microscopy, differential scanning calorimetry, and wide angle X-ray diffraction. The morphology of solution grown single crystals and some thermodynamic quantities such as the equilibrium dissolution and melting temperature and the enthalpy and entropy of fusion are influenced by the percentage of unsaturated comonomer. The thermal behaviour and the X-ray diffraction of these crystals suggest that saturated and unsaturated repeating units are able to cocrystallize.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1979.021800419
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of swelling agents on the stability of the low melting modification of trans 1,4-polyisoprene in the state of oriented fibers (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 166 (1973), S. 307-310 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021660127
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  • 4
    Electronic Resource
    Electronic Resource
    A study on the location of radiation induced cross-links in polyethylene single crystals by selective degradation (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 983-989 
    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: Frühere Arbeiten wiesen darauf hin daß in einem System mit Kettenfaltungen die durch Strahlung hervorgerufenen Vernetzungen keine statistische (random) Verteilung aufweisen können, sondern wahrscheinlich im Gebiet der Faltungen angereichert sind. Dieser Aspekt wurde jetzt durch eine neue Untersuchungsmethode wieder aufgegriffen, die den selektiven oxidativen Abbau bestrahlter Kristalle mit anschließender Analyse der Längenverteilung der resultierenden Kettenfragmente mit der Gelpermeationschromatographie (GPC) umfaßt. Es wird gezeigt, daß der Fall, daß die Vernetzungsbrücken sich bevorzugt in der Nähe der Oberfläche der Falten befinden, eindeutig von einer statistischen Verteilung der Vernetzungsbrücken zu unterscheiden ist. Vorläufige Untersuchungen mit dieser Methode weisen auf eine starke Bevorzugung der Vernetzungen im Gebiet der Falten hin und stützen damit die früheren Schlußfolgerungen aus Messungen der Löslichkeit (Gel-Gehalt).
    Notes: Previous works indicated that in a chain folded system cross-links induced by radiation can not be randomly distributed but are likely to be concentrated in the region of the folds. This issue has now been reopened by a new approach involving selective oxidative degradation of the irradiated crystals and subsequent analysis of the length distribution of the resulting chain fragments by gel permeation chromatography (GPC). It is demonstrated that the situation where the cross-links are preferentially near the fold surface should be clearly distinguishable from a random cross-link distribution. The preliminary studies indicate strong preference of cross-linking in the fold region by this test in support of earlier conclusions reached from solubility (gel content) measurements.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750324
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  • 5
    Electronic Resource
    Electronic Resource
    Annealing behaviour of melt crystallised trans-1.4-polyisoprene (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 151 (1972), S. 159-168 
    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 untersuchten Proben des trans-1.4-Polyisoprens hatten verschiedene Gehalte der beiden bekannten festen Modifikationen. Bei Auftragung der Langperiode gegen die Temperungs-Temperatur wird ein scharfes Maximum mit steilem Abfall zu höheren Temperaturen hin beobachtet, das mit der Schmelztemperatur der niedriger schmelzenden Modifikation zusammenfällt.Der Gleichgewichtsschmelzpunkt Tm0 und die freie Energie σe der Kristallitoberfläche für die niedrigschmelzende Modifikation wurden mit Hilfe der thermodynamischen „Steigungs-Methode“ bestimmt, und zwar zu: Tm0 = 78°C und σe = 102 erg·cm-2.
    Notes: The annealing behaviour of samples of melt crystallised trans-1.4-polyisoprene, containing different percentages of the two solid modifications, was examined. The plots of long-spacings versus the annealing temperature show a discontinuity at a temperature that has been identified with the melting temperature of the low-melting modification.The equilibrium melting point Tm0 and the surface free energy σe of the crystallites of the low-melting modification of trans-1.4-polyisoprene has been calculated thermodynamically using the slope method. A value of 78°C and 102 erg·cm-2 is found for Tm0 and σe, respectively.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021510113
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  • 6
    Electronic Resource
    Electronic Resource
    Bromination of single crystals of trans-1,4-polybutadiene. Thermal behavior (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 151-164 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It is demonstrated by several methods (DSC, infrared spectroscopy, and small-angle and wideangle x-ray diffraction) that bromination of suspensions of single crystals of trans-1,4-polybutadiene is selective at the fold surface. As the thickness of the single crystals is increased, a larger number of double bonds per fold are brominated, i.e. a larger number of repeat units become accessible to bromine. This is consistent with an increase in the thickness of disordered surface layers with the crystallization temperature. A reduction of 40-60% in overall apparent enthalpies of transition and of melting and reduced ability of brominated single crystals to refold following annealing are also observed. Crystallization from the melt of trans-1,4-PBD with [ CH2—CHBr—CHBr—CH2 ] units along the chain is interpreted by assuming that some of these units are incorporated in the crystal lattice as defects.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180140113
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and properties of new potentially nonthrombogenic polymeric materials (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 2151-2162 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new family of block copolymers have been synthesized and characterized. These copolymers have a central block deriving from the polyaddition of N,N′-dimethylethylenediamine to 1,4-bis-acryloylpiperazine, and lateral blocks of polystyrene. Preliminary biocompatibility tests have demonstrated that these new products show promise as long-acting nonthrombogenic materials.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170150909
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  • 8
    Electronic Resource
    Electronic Resource
    Solution-grown single crystals of trans-polyoctenamer (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 10 (1972), S. 423-428 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.110100603
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