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  • Chemistry  (11)
  • multiple endothermic behavior  (1)
  • 1
    Digitale Medien
    Digitale Medien
    New copolymethacrylates with azo-chromophores in the side chain (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 243-250 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The synthesis and characterization of new poly({6-[4-(4-cyanophenylcarbamoyl)phenoxy]hexyl methacrylate}-co-{6-[4-(4- cyanophenylazo)phenoxy]hexyl methacrylate}) are reported. Their liquid-crystalline properties are investigated using differential scanning calorimetry, polarizing microscopy and X-ray diffraction techniques. The glass transition temperatures and the clearing points can be influenced by variation of the copolymer composition. The substances offer a relatively broad temperature range of mesomorphic properties suitable for photochemical studies.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1993.021940120
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  • 2
    Digitale Medien
    Digitale Medien
    New side-group liquid-crystalline polymethacrylates (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 1125-1135 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A new route of synthesis of liquid-crystalline polymethacrylates was investigated. The synthetic route involved side-group liquid-crystalline polymethacrylates (LCPMA) with a turned ester group between the aromatic rings in the central unit of mesogens (2) as compared with the usual LCPMA (1). For a series of compounds of this type the liquid-crystalline properties were investigated using differential scanning calorimetry, polarizing microscopy and X-ray diffraction techniques. Generally stable smectic phases were found for these isomeric LCPMA. The described synthetic route opens possibilities to form new polymers from a wide field of educts.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1993.021940408
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  • 3
    Digitale Medien
    Digitale Medien
    Changes in liquid-crystalline phase behaviour of some poly[p-(methacryloyloxyalkyleneoxy)benzoate]s with bromination at the m-position in the mesogens (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 2015-2026 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The structural properties of side-group liquid-crystalline polymers with large electronegative space-filling substituents at the mesogenic groups were investigated. The synthesis and characterization of some poly[m-bromo-p-(methacryloyloxyalkyleneoxy)benzoate]s are reported. Their liquid-crystalline properties were investigated using differential scanning calorimetry and X-ray diffraction techniques and were compared to some unsubstituted compounds found in the literature. A general decrease in the phase transition temperatures and in the order of the liquid-crystalline phases for the Br-substituted compounds was observed. It can be concluded that the liquid-crystalline properties of polymers with large side-group substituents at the mesogens can be maintained if long flexible or large electron-rich end groups are introduced.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1992.021930820
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis and characterization of some new photochromic side-chain liquid-crystalline polymers (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 3073-3082 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The synthesis and characterization of a series of liquid-crystalline copolymethacrylates containing side chains with both azobenzene and benzanilide moieties is described. The phase behaviour of the polymers is discussed in dependence of their copolymer composition. The copolymers are suitable for optical investigations on the photochemical trans-cis isomerization of the azo group.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1992.021931214
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  • 5
    Digitale Medien
    Digitale Medien
    New azo-dye containing side group copolymethacrylates (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 1943-1949 
    Details
    ISSN: 1022-1352
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A new type of side group copolymethacrylates was synthesized, characterized and tested with respect to its behavior on irradiation with an Ar+-laser beam. The side groups consist of methylene spacer units with different length and of three-ring mesogens with an ester group between the first and the second aromatic ring and on the other hand of two-ring mesogens with an azo-structure between the aromatic rings, respectively. The azochromophoric structure contains different substituents in the terminal aromatic ring. The homopolymers of the azo-dye containing monomers do not display liquid crystalline (lc) mesophases, but the three-ring mesogens induce lc-phases in opposition to the equimolaric copolymers with two-ring ester group mesogens. The lc phases are important for the stability of the recorded change of birefringence (photorecording process) which is influenced by irradiation of the polymers.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Phase transitions of side-group liquid crystalline polymers with a metastable SA phase (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 7-13 
    Details
    ISSN: 1022-1336
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/marc.1994.030150103
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  • 7
    Digitale Medien
    Digitale Medien
    A phase polymorphism N—SAd—I in liquid-crystalline polymethacrylates with 4′-trifluoromethoxyazobenzene mesogenic side groupsDedicated to Prof. Dr. Jürgen Springer with best wishes on the occasion of his 60th birthday (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 16 (1995), S. 161-167 
    Details
    ISSN: 1022-1336
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The mesophase behaviour of liquid-crystalline polymethacrylates with 4′-trifluoromethoxyazobenzene mesogens and alkylene spacers \documentclass{article}\pagestyle{empty}\begin{document}$ \left( {\rlap{--} ({\rm CH}_{\rm 2} \rlap{--} )_n ,n = 2 - 6} \right) $\end{document} in the side chains was investigated and compared with that of the corresponding non-fluorinated polymers. The fluorinated polymers with spacer lengths n = 5 and 6 are the first side-group liquid-crystalline polymethacrylates showing a nematic phase below a smectic A phase.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/marc.1995.030160302
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  • 8
    Digitale Medien
    Digitale Medien
    Liquid crystalline networks of polymethacrylates (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 3427-3434 
    Details
    ISSN: 1022-1352
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: LC networks on the basis of methacrylate and dimethacrylate components were synthesized via bulk and precipitation copolymerization. Up to an amount of crosslinking component of 1 mol-% a smetic A phase is observed. The networks with 3 and 5 mol-% only show a nematic phase. From X-ray diffraction an orientation of the smectic phase was observed that derives from surface effects or biaxial swelling. It was found that the orientation can be increased by multiple swelling/deswelling cycles.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1996.021971028
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  • 9
    Digitale Medien
    Digitale Medien
    Influence of chirality on the phase behaviour of copolymers containing cholesterol as mesogenic moiety (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 1337-1348 
    Details
    ISSN: 1022-1352
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Liquid-crystalline side-group copolymers containing cholesterol and chiral nonmesogenic chloropropionate acid groups were synthesized and investigated by means of size-exclusion chromatography, proton nuclear magnetic resonance (1H NMR), polarization microscopy, X-ray diffraction and differential scanning calorimetry. In addition the spacers of the cholesterol-containing side groups were modified by substitution of two of the methylene groups by oxygen ether groups. The cholesterol-containing homopolymer displays only an SA-mesophase. Amounts of more than 50 mol-% of the non-mesogenic chiral co-compounds led to the total disappearance of liquid-crystalline phases. For less than 50 mol-% a different phase behaviour was observed for the copolymers with unsubstituted and ether-substituted spacers. Phase transition temperatures depend also on the chirality of the non-mesogenic groups. Similar results were obtained by investigating a copolymer system, which contains chiral camphor-10-sulfonic acid moieties and which was synthesized to check this observation.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1996.021970413
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  • 10
    Digitale Medien
    Digitale Medien
    Influence of the mesophase structure on the β-relaxation in liquid crystalline poly(meth)acrylates (1996)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 7 (1996), S. 853-857 
    Details
    ISSN: 1042-7147
    Schlagwort(e): liquid crystalline polymethacrylates and polyacrylates ; dielectric spectroscopy ; X-ray experiments ; β-relaxation ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: The dependence of the rotation of the mesogenic unit around its long axis (β-relaxation) on the actual mesophase in liqid crystalline polymethacrylates and polyacrylates was studied by dielectric spectroscopy in the frequency range from 10-2 Hz to 106 Hz and in a temperature range from 170 K to 430 K. As mesogenic units derivatives of (p-alkoxy-phenyl)-benzoate were used where different mesophases were achieved by small variation of the mesogenic structure, the spacer length and the tail group of the mesogenic unit. For all samples the temperature dependence of the relaxation rate of the β-relaxation can be described by an Arrhenius equation where both the pre-exponential factor and the activation energy increase significantly with the order of the mesophase. To characterize the structure X-ray measurements were also carried out. The mean lateral mesogenic distance was correlated directly with relaxational quantities.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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