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  • 1
    Electronic Resource
    Electronic Resource
    Viscoelastic relaxations in oxidized poly(hexamethylene sulfide) (1984)
    s.l. : American Chemical Society
    Macromolecules 17 (1984), S. 348-351 
    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/ma00133a016
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  • 2
    Electronic Resource
    Electronic Resource
    Anionic synthesis and thermal properties of poly(3,3-diethylthietane) (1989)
    Springer
    Polymer bulletin 21 (1989), S. 571-576 
    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 3,3-Diethylthietane has been polymerized by means of the anionic initiators butyl lithium and naphthalene sodium. Linear poly (3,3-diethylthietane) samples have been obtained. The molecular weight of these polymers, measured by GPC, ranges from 70,000 to 241,000. The molecular weight distribution is quite narrow. Calorimetric measurements show a glass transition temperature, extrapolated to zero heating rate, of 236.7 K. The melting curves of a sample isothermally crystallized from the melt at 303 K show two different melting peaks located at 326 and 334 K, respectively. The wide angle X-ray diffractograms for poly (3,3-diethylthietane) crystallized at 303 and 330 K gave identical patterns. Microscopy and small angle light scattering observations show that the supermolecular structure corresponds to ordered spherulites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264137
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  • 3
    Electronic Resource
    Electronic Resource
    Raman spectroscopic study of a substituted poly(phosphazene) (1991)
    Springer
    Polymer bulletin 25 (1991), S. 351-356 
    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 Polyphosphazenes present a range of unique and fascinating physical properties, including thermotropic behaviour, which are highly dependent both on the type of substitution at the P atom in the inorganic backbone, and the thermal history of the material. Recent technological advances have allowed us to study this group of polymers using vibrational spectroscopy. Fourier transform (FT) Raman spectra have been recorded from samples of poly[bis(4-methoxy-phenoxy)phosphazene] with different thermal histories. With the aid of spectral subtraction methods, differences observed between the spectra have been related to the crystalline and mesophase content of the materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316905
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Polymerization of tetrahydrofuran by bifunctional cationic initiators: Terephthaloyl perchlorate (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 731-737 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics and mechanism of the polymerization of tetrahydrofuran with terephthaloyl perchlorate in methylene chloride or cyclohexane were analyzed. This polymerization produces dicationically active polymers and takes place without induction period. Propagation in both solvents proceeds as a reaction being first order in monomer, and it changes with the polarity of the solvent because ionic and covalent species take part with different growing rates. The macroester mole fractions in cyclohexane and methylene chloride are 0,99 and 0,86, respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820303
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  • 5
    Electronic Resource
    Electronic Resource
    Comments on G. Pruckmayr's criticisms on our paper “influence of water in the polymerization of tetrahydrofuran” (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1233-1234 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850616
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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Asymmetrically branched alkyl spacers in liquid-crystalline poly(alkylene 4,4′-terephthaloyldioxydibenzoate)s (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 2251-2258 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly[oxy-(1,4-dimethyltetramethylene)oxycarbonyl-1,4-phenyleneoxyterephthaloyloxy-1,4-phenylenecarbonyl] (1) was synthesized for the first time, and its thermal behaviour was studied by differential scanning calorimetry, thermooptical microscopy, and X-ray diffraction. The crystal to liquid-crystal and the mesophase to isotropic transition temperatures are lower by ca. 100°C than the values reported for the unsubstituted polymer. Moreover, the formation of a three-dimensional order is hindered in the case of the polymer with lateral substituents and can only be achieved by long annealing times.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930908
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics of polymerization of tetrahydrofuran initiated by acetyl perchlorate (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 725-730 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of the polymerization of tetrahydrofuran by acetyl perchlorate in methylene chloride solution was studied, and the results were compared with those previously reported by using perchloric acid/acetic anhydride as catalyst. The initiation and propagation mechanisms are discussed by taking into account the influence of the counterion. The initiation reaction takes place instantaneously, but the propagation proceeds by macroesters and macroions and the contribution of macroester to propagation is much lower than the contribution of macroions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820302
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  • 10
    Electronic Resource
    Electronic Resource
    Oxidation of poly(tetramethylene sulfide) (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1255-1263 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Oxidation of poly(tetramethylene sulfide) single crystals was carried out in a dispersion of distilled water at 25°C using trifluoroacetic acid and H2O2. The oxidation takes place in two different stages: the first one corresponds to preferential formation of sulfoxide groups and the second one, at higher concentrations of oxidizing agent, corresponds to formation of sulfone groups. Changes in crystallinity and melting behaviour of the intermediate polysulfones obtained were followed by X-ray diffraction and calorimetry. Changes in the heat and temperature of melting and in the morphology are related to the different stages of oxidation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850618
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