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  • 1980-1984  (37)
  • 1950-1954  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Zur Auswertung von Streulichtmessungen (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 354-355 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00643278
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  • 2
    Digitale Medien
    Digitale Medien
    Micro- and macroconformation of macromolecules (1981)
    Springer
    Polymer bulletin 4 (1981), S. 609-616 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary From the temperature dependence of 13C-NMR chemical shift measurements under fast exchange conditions, using the methyl carbon atom as indicator, it was concluded that for erythrodiisotactic head-to-head tail-to-tail polypropylenes the temperature dependence of the conformers around the methine-methine bond may be analyzed quantitatively. In the present paper the 13C-NMR analysis has been expanded to inverted polypropylenes of arbitrary ditacticity. Methyl, methylene as well as methine resonances have been taken into account for assignements. Conformational influences on the 13C-NMR spectrum are discussed as well as the relevance of low molecular weight models for diads.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256289
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  • 3
    Digitale Medien
    Digitale Medien
    Micro- and macroconformation of macromolecules (1981)
    Springer
    Polymer bulletin 4 (1981), S. 383-390 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary A semiempirical modification of FERRY's extension of the ROUSE spectrum in the entanglement region is proposed, with a smooth transition in the relaxation behaviour. Consequently the zero shear viscosity-molecular weight relationship is modelled. With the molecular weight between the entanglements as the only parameter measurements on cis- 1, 4-polybutadiene could be reproduced accurately, comparing favourably with the recent multiparameter theory by SHEN. A simple linear weighting scheme for the average friction coefficient of chemical and configurational copolymers, e. g. cis-trans-polybutadienes, is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00254969
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  • 4
    Digitale Medien
    Digitale Medien
    Micro- and macroconformation of macromolecules (1981)
    Springer
    Polymer bulletin 6 (1981), S. 93-100 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The first results are reported about the conformational analysis of an amorphous polymer in the glassy state by means of proton enhanced variable-temperature magic angle spinning 13C NMR experiments. In amorphous threodiisotactic poly(1,2-dimethyltetramethylene) at 220 K different conformational diads could be resolved and assigned. From the spectrum of the glassy polymer the shift increment associated with a conformational change of main chain bonds from anti to gauche is determined. In addition the populations of the conformations of CH-CH bonds and of CH-CH-CH2 bond pairs of poly(1,2-dimethyltetramethylene)s are determined in the glassy state and energy differences between these conformations are estimated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256510
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  • 5
    Digitale Medien
    Digitale Medien
    Cellulose containing block copolymers (1982)
    Springer
    Polymer bulletin 6 (1982), S. 583-588 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The solid state properties of trimethylcellulose — poly (oxytetramethylene) two and star block copolymers have been investigated by IR, WAXS, polarization microscopy, DSC, and mechanic dynamical measurements. The results are in agreement with a four phase morphology consisting of an amorphous and a crystalline phase of both trimethylcellulose and poly(oxytetramethylene). The solution properties of trimethylcellulose — poly(oxytetramethylene) block copolymers (TMC-POTM block copolymers) are governed mainly by the incompatibility of the two distinct blocks 1). In the following it is demonstrated that the incompatibility between the TMC and the POTM blocks is even more pronounced in the solid state than in solution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255159
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  • 6
    Digitale Medien
    Digitale Medien
    Donor-acceptor complexation in macromolecular systems (1982)
    Springer
    Polymer bulletin 6 (1982), S. 617-621 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Blends of donor-macromolecules — poly(N-(2-hydroxyethyl)-carb-azolyl)methacrylate — with acceptor-macromolecules — poly(methacryloyl-β-hydroxyethyl-3,5-dinitrobenzoate) — exhibit unique dynamic mechanical properties over a broad range of frequency and temperature when compared with those of the components. The complexation between the unlike polymers determines the topology of the thermoreversible network. Plateau modulus is extended into the low frequency and high temperature region dramatically. Corresponding copolymers show up minor improvement of the properties only depending on the donor-acceptor ratio within the macromolecular chain. Thus, the efficacy of intermolecular thermoreversible crosslinking clearly is evidenced.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255164
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  • 7
    Digitale Medien
    Digitale Medien
    Cellulose containing block copolymers (1982)
    Springer
    Polymer bulletin 6 (1982), S. 321-326 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Solution properties of trimethylcellulose-poly(oxytetramethylene two and star block copolymers with defined molecular weights are reported. The solubility behavior of the concerned block copolymers is mainly governed by the solubility of the trimethylcellulose blocks. The solubility parameters for TMC and POTM indicate that both polymers are incompatible with each other. This is confirmed by the appearance of phase separation in concentrated solutions of corresponding blends even in nonselective solvents. Intrinsic viscosities of the block copolymers are reported and compared to corresponding polymer blend solutions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255405
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  • 8
    Digitale Medien
    Digitale Medien
    Oscillatory normal stresses in mete and concentrated solutions of cis-1,4-polybutadiene (1982)
    Springer
    Polymer bulletin 7 (1982), S. 51-58 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Oscillatory normal stresses were measured in melts and concentrated solutions of cis-1,4-polybutadiene (PB), and compared to the Rouse theory, including polydispersity and molecular weight dependence. Good agreement was obtained in all but one sample consisting of low molecular weight PB oil, where the first normal complex stress coefficient was abnormal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00264157
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of molecular weight heterodispersity on linear viscoelastic properties of entangled polymers (1982)
    Springer
    Polymer bulletin 7 (1982), S. 137-144 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The nonlinear, binary blending law of BOGUE has been generalized to include a finite number of entangled species. Good agreement has been observed between the ROUSE theory modified according to this law and linear viscoelastic experiments on cis-1,4-polybutadiene melts and concentrated solutions. The more difficult case of heterogeneity due to simultaneous degradation and crosslinking can only be qualitatively accounted for.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00265464
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  • 10
    Digitale Medien
    Digitale Medien
    Micro- and macroconformation of macromolecules (1980)
    Springer
    Polymer bulletin 2 (1980), S. 543-550 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary An approach is discussed to determine the temperature dependence of the populations of conformers within macromolecules from NMR chemical shift data under fast exchange conditions. It seems to be applicable for subunits which exhibit conformations with two energy levels with an energy difference of about 4 KJ minimum. In case of the meso diad in head- to head polypropylene and of its low molecular weight model compounds the applicability of the method has been verified experimentally. The agreement with findings from the slow exchange spectra of the models is good. The energy differences of the rotamers are discussed for the low molecular models and for the polymer as well as the rotational barriers determined from the coalescence temperatures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255257
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