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  • 1985-1989  (4)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    Crystalline poly(3-ethyl-3-methyloxetane) (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 2497-2501 
    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/ma00164a007
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spherulitic growth rates of poly(3,3-dimethyloxetane) (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 439-447 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The morphology and growth rates of crystallized fractions of poly(3,3-dimethyloxetane) covering the range Mn = 18500 to Mn = 130000 were studied by polarized light microscopy at crystallization temperatures from 24 to 44°C. It was found that the growth rate is linear and only spherulites are formed in the temperature range examined. The growth rate-temperature coefficient was analyzed by using nucleation theory. The usual plots are linear in the whole range of crystallization temperatures, and the comparison between dilatometric and growth data revealed that the overall rate- and growth rate-temperature coefficients are approximately the same.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860222
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polymorphism in poly(3,3-dimethyloxetane) (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 1731-1737 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A detailed study of the polymorphism of poly(3,3-dimethyloxetane) was carried out by differential scanning calorimetry and X-ray diffraction. From the relaxed melt state, two modifications, Form II (monoclinic) and Form III (orthorhombic), are separately obtained depending on crystallization temperature. When the crystallization is accomplished for a given modification, this one is stable at any temperature below its melting temperature. However, if the crystallization of a given modification is not complete, the other modification can be crystallized from the amorphous phase. Thus, a possibility of obtaining both forms exists. The kinetic and thermodynamic factors which govern this process are analyzed. The free energies were calculated and the conclusion is that modification II is thermodynamically the most stable one at all temperatures below its melting point.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860822
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Small-angle X-ray diffraction study of the monoclinic modification of poly(3,3-dimethyloxetane) (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 613-621 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The long spacings of several samples of poly(3,3-dimethyloxetane) (PDMO) were determined by small-angle X-ray diffraction as a function of molecular weight and crystallization temperature, in the interval where only the monoclinic modification is produced. The equilibrium melting temperature and the basal interfacial free energy of the mature crystals were determined from the correlation between long spacings and melting temperatures. Finally, an estimation of the critical sizes of the nuclei was made from nucleation theory, and the results were compared with the actual sizes of the crystallites, assuming a two-phase model. Our results show that both the nuclei and the mature crystals have rather small sizes, which is attributed to the high under-coolings involved in the crystallization of PDMO.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021900317
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    Paper (German National Licenses)
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