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  • 1
    Digitale Medien
    Digitale Medien
    Light scattering from dilute polymer solutions in shear flow (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 464-471 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00055a010
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  • 2
    Digitale Medien
    Digitale Medien
    Das hydrodynamische Verhalten des Poly-N-vinyl-carbazols (1967)
    Springer
    Colloid & polymer science 215 (1967), S. 21-28 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Summary Light scattering, viscosity, sedimentation and osmotic pressure measurements were performed for a number of fractions of poly-N-vinylcarbazole solutions in benzene and toluene of molecular weight range from 1·105 to 4·106. The information is used to calculate the configurational and hydrodynamic constants of the polymer. The constantsΦ andF after being corrected for molecular weight heterogeneity and excluded volume effects are found to deviate appreciably from the empirical values. The deviations are discussed in term of rigidity or the short range statistics of the polymer. The intrinsic viscosity theory ofStockmayer andHearst is discussed in the light of the new data.
    Notizen: Zusammenfassung An Fraktionen des Poly-N-vinylcarbazols in einem Molekulargewichtsbereich von 1·105 bis 4·106 wurden Messungen der Lichtstreuung, der Viskosität, der Sedimentation und des osmotischen Druckes in Benzol und Toluol durchgeführt. Hieraus wurden die Form und die hydrodynamischen Konstanten des Polymeren berechnet. Die KonstantenΦ undF weichen auch nach Korrekturen für die Heterogenität und das ausgeschlossene Volumen deutlich von den empirischen Werten ab. Die Abweichungen wurden auf Grund der Steifheit oder der Statistik für den Nahbereich diskutiert. Die Viskositätstheorie vonStockmayer undHearst wurde an Hand der Ergebnisse geprüft.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01500475
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  • 3
    Digitale Medien
    Digitale Medien
    Beiträge zur Thermodynamik von Polymerlösungen (1968)
    Springer
    Colloid & polymer science 226 (1968), S. 138-141 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Summary Poly-γ-benzyl-L-glutamate was investigated in different solvents (chlorobenzene, cyclohexanone, dichloroethane, dimethylformamide, dioxane, tetrahydrofurane) by light scattering. For the evaluation of light scattering measurements a computer program is available. The mixture of dichlorethane and 20 percent (by volume) diethylenglycol is a theta-solvent at 25°C. In chlorobenzene association and aging of the polymer appear.
    Notizen: Zusammenfassung Poly-γ-benzyl-L-glutamat wurde in verschiedenen Lösungsmitteln (Chlorbenzol, Cyclohexanon, Dichloräthan, Dimethylformamid, Dioxan, Tetrahydrofuran) mit Hilfe der Lichtstreuung untersucht. Für die Auswertung von Lichtstreuungsmessungen steht ein Computerprogramm zur Verfügung. Das Gemisch Dichloräthan mit 20,0 Vol.-% Diäthylenglykol ist bei 25°C ein Thetalösungsmittel. In Chlorbenzol treten starke Assoziationen und Alterungserscheinungen auf.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02086258
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  • 4
    Digitale Medien
    Digitale Medien
    Properties of liquid crystalline polymers in solution, 1. Determination of the molecular weight of polymethacrylates with mesogenic sidegroupsDedicated to Professor Dr. H.-J. Cantow on his 60th birthday (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1489-1496 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Derivatives of poly(methacrylic acid) with mesogenic sidegroups are aggregated in solution. Through structural changes which also take place in the solid state, the fraction of the aggregates increases with storage time. The formation of aggregates depends on temperature and occurs relatively slowly. In solution, the degree of aggregation strongly depends on the solvent. This aggregation leads to relatively high tacticity in products obtained by radical initiated polymerisations.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1983.021840715
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  • 5
    Digitale Medien
    Digitale Medien
    Orientational behaviour of polymer blends containing a liquid-crystalline component (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 3185-3194 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: This paper describes the orientational behaviour of polymer blends containing a side-group liquid-crystalline polymer (LCP). The macroscopic orientation of the LC phase in these blends, and the possibility to freeze in this state are of technical interest. The orientation of LCP-containing blends through mechanical forces depends on a variety of structural, thermal, energetical and also morphological properties, which are strongly dependent on the kinetical and thermal history. This report describes the optical- and scanning electron microscopy (SEM), X-ray diffraction and interfacial tension studies of the liquid-crystalline polyacrylate 1a and the poly(methacrylate) 1b in poly(methyl methacrylate) (PMMA) and polycarbonate matrices. 1a droplets in thermoplastic matrices can be oriented macroscopically during fibre-drawing, but, as a result of higher interfacial tension between the components, 1b-containing blends can not.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1989.021901216
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  • 6
    Digitale Medien
    Digitale Medien
    Surface tensions of liquid-crystalline and isotropic polymer melts (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1129-1138 
    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 surface tensions (γ) of a branched polyethylene and two side-group liquid-crystalline (lc) polyacrylates were measured in the isotropic, nematic and smectic states by the pendant-drop method. The surface tension vs. Temperature characteristics of the lc polyacrylates studied show anomalous behaviour. The slope in the isotropic state is initially negative but changes its sign near the isotropic-nematic transition. The increase of γ with decreasing temperature is regained in the nematic phase, until at the nematic-smectic transition the surface tension of the lc polymers discontinuously jumps to higher values and shows a very low temperature coefficient. The observed features have been found to be partly in agreement with the results of surface tension measurements on low-molar-mass liquid crystals, which indicates that the surface properties of the lc polymers are governed by the mesogenic side groups.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1991.021920512
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  • 7
    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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  • 8
    Digitale Medien
    Digitale Medien
    Herstellung und eigenschaften von polyacenaphthylen, 3Teil 2, cf.: J. Springer, J. Schmelzer, T. Zeplichal, Chromatographia 13, 164 (1980).. Photoabbau von polyacenaphthylen (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1719-1725 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Thermally prepared polyacenaphthylene when irradiated in solution undergoes random chain scission. The photodegradation is solvent- and temperature-dependent and leads to a lower limit of the degree of polymerization. Polymeranalogous reactions and crosslinking can be found to occur simultaneously. A certain fraction of „weak links“ was detected in the polymer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1984.021850818
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  • 9
    Digitale Medien
    Digitale Medien
    Spacer length and molecular weight variation on ferroelectric liquid crystalline polymers (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 3097-3115 
    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 influence of the spacer length (n = 2, 6, 8 and 11 methylene groups) on the polymorphism and the ferroelectric properties of liquid crystalline side-group polyacrylates with a 4-[(R)-4-(1-methylheptyloxy)-4′-biphenylyloxycarbonyl]phenoxy moiety was studied. Various molecular weights were obtained from the polymers with n = 8 and n = 11. All the polymers show SmC* phases. A SmC* phase polymorphism was even found for most of the polymers. In some of these SmC* phases, no ferroelectric properties could be measured. The structural differences between the SmC* phases and their influence on the appearance of the ferroelectric properties are not yet clear. However, a SmC̃* phase was put in evidence, revealing a tendency to a chevron-like ordering which may explain the complex SmC* polymorphism of these systems.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1992.021931216
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  • 10
    Digitale Medien
    Digitale Medien
    Enhanced crystallization by annealing of poly(phenylene sulfide) in presence of CO2 and N2O (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 339-351 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Crystallization of amorphous poly(phenylene sulfide) was carried out upon annealing in the presence of sorbed CO2 and N2O at pressures of 50 bar. Thermal crystallization at the same pressure allows the comparison of crystallization rates. From the results of IR-spectroscopy, wide angle X-ray diffraction, differential scanning calorimetry and density measurements, it is seen that in the presence of sorbed gas molecules crystallization occurs even at temperatures below the glass transition measured at atmospheric conditions. At a given temperature, gas sorption yields accelerated crystallization. The results, show the considerable plasticizing influence of sorbed gas molecules. From the crystallization rate at sorbed gas conditions the plasticizing ability of the gas may be estimated. That of N2O exceeds that of CO2 by a factor of three. Assuming a simple two-phase model for the crystalline polymer the comparison of heat of melting and density values for t → ∞ allows the conclusion that parts of the noncrystalline volume fraction become less dense by annealing in the presence of sorbed gas molecules. An increased free volume fraction which may be formed in the non-crystalline regions is discussed. It is possible that the remaining lower density results from a hindered relaxation of chain molecules from the dilated state they take due to gas sorption. In this context the influence of decreased mobility of non-crystalline chains is discussed in terms of the “rigid amorphous phase” concept.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1993.021940130
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