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  • Electronic Resource  (15)
  • 1985-1989  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Dielectric relaxation of liquid crystalline polyacrylates and polymethacrylates (1985)
    s.l. : American Chemical Society
    Macromolecules 18 (1985), S. 960-965 
    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/ma00147a026
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of electron-donor-acceptor complex formation on the melt viscosity of some poly(dimethylsiloxane)sDedicated to Ernst Trommsdorff on the occasion of his 80th birthday (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 1763-1772 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of poly(dimethylsiloxane)s was synthesized containing either electron donor or electron acceptor groups, statistically arranged along the polymer chain or only at the chain ends (telechelic polymers). Blending of the donor and acceptor modified statistical copolymers led to a strong increase of the melt viscosity as a consequence of complex formation. In contrast to this, complex formation had no significant influence on the viscosity in blends from telechelic polymers. This different behaviour seems to be caused by the different molecular architecture favouring crosslinking by complex formation for the statistical copolymers and a linear chain extension for the telechelic polymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860904
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  • 3
    Electronic Resource
    Electronic Resource
    Rheological properties of liquid-crystalline side-group polymers in the isotropic, nematic, and smectic states (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1727-1736 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The melt viscosity of seven liquid-crystalline side-group polymers with polyacrylate and polysiloxane main chains is measured as a function of shear rate and temperature. In the isotropic and also in the nematic phase none or only a very small dependence of the melt viscosity on shear rate is observed for the shear rates investigated. The melt viscosity in the nematic phase is higher than that in the isotropic phase. This is contrary to the results for liquid crystalline mainchain polymers and points to the fact, that there is no resulting orientation in shear flow of liquid-crystalline side-group polymers in the nematic phase. In the smectic phase the melt viscosity is very high and strongly shear-rate dependent. These results are compared with dielectric relaxation measurements on polymethacrylates and a polychloroacrylate.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870716
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  • 4
    Electronic Resource
    Electronic Resource
    Liquid crystalline elastomers based on liquid crystalline side group, main chain and combined polymersPresented in part at the: 2nd Macromolecular Symposium, BRD-USSR, 30. 9.-4. 10. 1985, Mainz, West Germany; cf.6. (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1915-1926 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Covalently crosslinked liquid crystalline networks with elastic properties were prepared in isotropic solution from linear liquid crystalline polymers. As linear precursors for the networks were used: (i) polymers with the mesogenic groups in the side groups (polyacrylates and polymethacrylates), (ii) polymers with the mesogenic groups in the main chain (polymalonates) and (iii) polymers with the mesogenic groups in main chain and side groups (“combined liquid crystalline polymers”). In all crosslinked polymers the liquid crystalline phases of the linear polymers are retained. For low degrees of crosslinking (≤2 mol-%) the phase transition temperatures remain nearly unchanged. These elastomers are very soft above Tg and can be easily stretched for more than 100%. For higher degrees of crosslinking the phase transition temperatures are reduced.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870811
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  • 5
    Electronic Resource
    Electronic Resource
    Crosslinkable liquid-crystalline combined main-chain/side-group polymers with low glass transition temperatures (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 791-796 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Crosslinkable and crosslinked liquid-crystalline polymers with elastic properties were prepared from main-chain and combined main-chain/side-group polymers. These polymers exhibit nematic, smectic A, and smectic C phases. Polymers of these types with azoxybenzene as mesogen do not crystallize upon cooling. As a consequence, the liquid-crystalline phases are frozen in glassy around room temperature.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890410
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  • 6
    Electronic Resource
    Electronic Resource
    Combined liquid-crystalline polymers with chiral phases, 1 2-octanol as chiral end of the mesogens (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 797-804 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Combined liquid-crystalline polymers containing azobenzene and azoxybenzene as the mesogenic groups and 2-octanol as the chiral end-group were synthesized and characterized. These polymers exhibit cholesteric, smectic A, and chiral smectic C* phases with monolayer and doublelayer structures. The polymers with azoxy groups do not crystallize upon cooling. Therefore, some of the liquid-crystalline phases can be frozen in in the glassy state.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890411
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  • 7
    Electronic Resource
    Electronic Resource
    Combined liquid-crystalline polymers with chiral phases, 2Part 1: S. Bualek, R. Zentel, Makromol. Chem. 189, 797 (1988). Lateral substituentspresented in part at the Conference “Liquid Crystal Polymers” in Bordeaux 20 - 24, Juli 1987, ref.20. (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 1793-1807 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chiral combined liquid-crystalline polymers (i. e. polymers with the mesogenic groups in the main chain as well as in the side groups) with dipole moments perpendicular to the mesogenic groups were synthesized and characterized. These dipole moments were introduced by lateral substituents, which were located at different parts of the mesogen or directly at the chiral centre. The polymers, thus prepared, show crystalline or glassy phases at room temperature and smectic A, chiral smectic C* or cholesteric phases at higher temperatures. Since the lateral substituents decrease the melting temperature more strongly than the clearing temperature, the liquid-crystalline phases are broadened compared to the unsubstituted polymers. Often glassy liquid-crystalline phases are obtained. The dipole moments perpendicular to the mesogenic groups or at the chiral centre may help to obtain a high spontaneous polarisation in the chiral smectic C* phase (ferroelectricity).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890805
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  • 8
    Electronic Resource
    Electronic Resource
    Stress-induced orientation in lightly crosslinked liquid-crystalline side-group polymers (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 665-674 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: X-ray measurements of stretched crosslinked liquid-crystalline side group polymers show that two types of orientation of the mesogenic groups relative to the polymer chains (parallel or perpendicular) are possible, depending on the structure of the polymer chain. For two liquid-crystalline polymethacrylates with long spacer groups (6 methylene units) the mesogenic groups orient preferably perpendicularly to the polymer chains (axis of strain). For three liquid-crystalline polyacrylates with long or short spacer groups (6 or 2 methylene units), the mesogenic groups orient preferably parallel to the polymer chains (axis of strain). The reason for this difference is not yet clear. These results are compared with earlier results of melt-drawn fibres of uncrosslinked polymers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880318
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  • 9
    Electronic Resource
    Electronic Resource
    Liquid-crystalline elastomers with cholesteric and chiral smectic C* phases (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 2869-2884 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of 9 new chiral and crosslinkable liquid-crystalline copolymers were synthesized and transformed into liquid-crystalline elastomers by crosslinking using a hydrosilylation reaction. Both the soluble copolymers and the elastomers show cholesteric, smectic A and chiral smectic C* phases, which are not affected by the crosslinking procedure. First measurements show that the helical superstructure of elastomers with cholesteric and chiral smectic C* phases can be reversibly untwisted by stretching. Thereby a cholesteric structure can be transformed into a nematic structure and a chiral smectic C* structure into a smectic C one.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021901118
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  • 10
    Electronic Resource
    Electronic Resource
    X-ray investigations of liquid crystalline homo- and copolysiloxanes with paired mesogens (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 1993-2000 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: X-ray scattering experiments on oriented polysiloxanes with paired mesogens and different distances between these swallow-tailed side groups show a remarkable dependence of the smectic monolayer thickness on the degree of dilution, whereas the interplanar distance of the side groups remain nearly constant. Due to the dominating interaction of the mesogenic moieties, the flexible main chain is forced to take part in the layer formation. A packing model is proposed to explain the results of the X-ray studies. For polymers with five or more dimethylsiloxane copolymer segments, a diffuse scattering appears in the smectic as well as in the isotropic phase. This scattering is independent of the orientation of the samples. It is probably caused by the main chain and has also been observed for the unsubstituted poly(hydrogenmethylsiloxane).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880821
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