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  • 1
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    Interactions in aqueous polypeptide derivative/surfactant systems (1993)
    Springer
    Details
    Publication Date: 1993-08-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 2
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    Review of Crystalline Structures of Some Selected Homologous Series of Rod-Like Molecules Capable of Forming Liquid Crystalline Phases (2011)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2011-10-28
    Print ISSN: 1661-6596
    Electronic ISSN: 1422-0067
    Topics: Chemistry and Pharmacology
    Published by Molecular Diversity Preservation International
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  • 3
    Electronic Resource
    Electronic Resource
    Interactions in aqueous polypeptide derivative/surfactant systems (1993)
    Springer
    Polymer bulletin 31 (1993), S. 213-219 
    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 A new class of compounds of water-soluble polypeptide derivatives have been synthesized and the interactions with the anionic surfactan sodium dodecylsufate (SDS) studied by rheological and light scattering investigations. The viscosity of the aqueos polypeptide solution passes through a distinct maximum with increasing surfactant concentration. This behaviour, so far only known for hydrophobically modified cellulose derivatives, can be explained by a formation and decay of polymer surfactan networks. The changes caused by microscopic structural parameters through surfactant adsorption are observed by dynamic light scattering and can be correlated with the macroscopic behaviour of the solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329968
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  • 4
    Electronic Resource
    Electronic Resource
    Übermolekulare flüssigkristalline strukturen von hochkonzentrierten cellulosederivatlösungenVortrag anläßlich der Tagung der Fachgruppe “Makromolekulare Chemie” der Gesellschaft Deutscher Chemiker über “Polymere und biologische Funktionen” in Bad Nauheim am 18. und 19. April 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 131-138 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Lyotropic liquid crystalline phases of cellulose derivatives were explored as an analytical tool. Molar mass dependent measurements of the helicoidal cholesteric pitch of a cellulose tricarbanilate/solvent system may be used to determine the molar mass of this derivative by optical means. The compatibility of a ternary liquid crystalline system can be adequately investigated by a study of the supermolecular structure with spectroscopic measurements.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051660109
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  • 5
    Electronic Resource
    Electronic Resource
    Packing analysis of carbohydrates and polysaccharides. IV. A new method for detailed crystal structure refinement of polysaccharides and its application to V-amyloseThe work described in this paper was presented at the “Makromolekulares Kolloquium Freiburg”, in Freiburg, West Germany, March 1975. (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 2121-2136 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is described for predicting and solving crystal structures of linear homopolysaccharides. The method is based on the refinement of the structure with respect to either stereochemical constraints or x-ray diffraction intensities. In the refinement process, all conformational and packing features of the molecule, such as bond lengths, bond angles, conformational angles, nonbonded contacts, hydrogen bonds, etc., can be allowed to vary until the structure reaches both a conformation and crystalline packing that are in minimum disagreement with the stereochemical restraints and the diffraction data. In this fashion, both packing and conformational features of the structure can be simultaneously refined, and not separately as has been the custom in the past. The refinement procedure is based on a method of constrained optimization which possesses improved characteristics of reaching a solution and avoiding false minima, in comparison with least squares methods. The procedure is, in addition, capable of easily finding molecules of solvent of crystallization. The method was applied to further refining the previously solved crystal structure of V-amylose. The results indicated that contrary to the previously found six-fold molecular symmetry in the P212121 space group, the V-amylose molecule exhibits only two-fold symmetry with the asymmetric unit consisting of three glucose residues in one-half turn of the helix. The three residues are nonequivalent principally due to unequal rotational positions of the hydroxymethyl groups. The crystal structure of V-amylose predicted from stereochemical refinement was identical in all details with that obtained from refining against X-ray data. The excellent agreement with the diffraction data was indicated by the crystallographic disagreement index R = 0.25.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360151103
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  • 6
    Electronic Resource
    Electronic Resource
    Correlation between microscopic structural parameters and macroscopic flow behaviour of some polymer-surfactant systems suitable for tertiary oil recovery (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 57-77 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Einige für den kombinierten Polymer-Tensid-Einsatz in der tertiären Erdölförderung (EOR) diskutierte Substanzen wurden mittels statischer und dynamischer Lichtstreuung charakterisiert und bezüglich ihrer Anwendbarkeit in unterschiedlich salinaren Modellwässern durch rheologische und rheologisch-dynamische Messungen unter-sucht.Als Polymere wurden Xanthan sowie unterschiedlich hydrolysierte Polyacrylamide verwendet, als Tensid ein Ethylenglykolsulfonat. Es ließen sich Korrelationen zwischen mikroskopischen Strukturparametern (z. B. hydrodynamischer Radius, Trägheitsradius, Molekulargewicht, Gestaltparameter der gelösten Polymeren) und makroskopischem Verhalten wie Viskosität aufstellen, welche für den EOR-Einsatz wichtige rheologische Parameter darstellen.Mit ergänzenden Messungen (Oberflächenspannung, zeitabhängiges Viskositätsverhalten) können Aussagen über die Effizienz und Langzeitstabilität eingesetzter Polymer-Tensid-Slugs in unterschiedlich salinaren Lagerstätten gemacht werden.
    Notes: Some materials, suitable for application in polymer-surfactant flooding used in tertiary oil recovery (EOR), have been characterized by static and dynamic light scattering and studied in respect to their suitability in various model brines by measuring their rheological and dynamic-rheological behaviour. Xanthan and polyacrylamides of different degree of hydrolysis have been used as polymers, an ethylene glycol sulfonate as surfactant.Correlations have been established between microscopic structural parameters (Hydrodynamic radius, radius of gyration, molar mass, shape of the polymers) and the macroscopic behaviour, such as viscosity and elasticity, being important rheological parameters for EOR application. Additional investigations on surface tension and long term viscosity study lead then to a judgement for the efficiency and long term stability of polymer-surfactant slugs in various reservoirs of different salinity.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051950104
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  • 7
    Electronic Resource
    Electronic Resource
    Structural investigations on cellulose tricarbanilate: Conformation and liquid crystalline behaviourDedicated to professor Dr. H.-J. Cantow on the occasion of his 60th birthday (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1749-1760 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The phase behaviour of cellulose tricarbanilate (CTC) in ethyl methyl ketone (MEK) solutions was studied in the concentration range of 0,2 - 0,8 g/ml as a function of the temperature. By analyzing the textures in the polarizing microscope and by differential scanning calorimetry experiments several different phase transitions and mesophases were detected. At a concentration below 0,6 g/ml CTC in MEK, phase transitions were observed from the crystalline through a liquid crystalline (cholesteric) to the isotropic state. At concentrations higher than 0,6 g/ml, a different behaviour of the CTC solutions was detected and several transitions were found, but only the cholesteric-isotropic transition could be identified. The concentration dependence of the cholesteric-isotropic transitions was determined over the whole concentration range. The conformation of the CTC molecule was studied and a stiff, almost cylindrically shaped 3/2 helix with a repeat distance of 15,25 Å is proposed.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840818
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  • 8
    Electronic Resource
    Electronic Resource
    Solvent dependence of lyotropic liquid-crystalline phases of cellulose tricarbanilateDedicated to Prof. Dr. H. Sinn on the occasion of his 60th birthday (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 1177-1196 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Cellulose tricarbanilate (CTC) represents a derivative of cellulose which is excellently suited for a systematic study of the formation of lyotropic liquid crystals with solvents containing ether, ester or keto groups. The dependence on temperature, concentration and on structural features of the solvents as well as the phase behaviour were investigated in detail, especially with glycols, the chemical constitution of which was varied with respect to the glycol chain length and to the end groups. CTC with a narrow molar mas distribution and a degree of polymerization (DP) between 30 and 500 was synthesized for this study through derivatization of cellulose with subsequent degradation and fractionation.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910519
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  • 9
    Electronic Resource
    Electronic Resource
    Formation of supermolecular structures of polysaccharide-surfactant complexes in aqueous solutions. Influence of the polymer backbone (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 1583-1593 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Novel water-soluble derivatives of cellulose, amylose and dextran are synthesized and investigated with regard to their special interactions with the anionic surfactant sodium dodecylsulfate (SDS) by means of rheological flow- and oscillatory measurements as well as electrolytic conductivity in aqueous solution. The derivatives of amylose and dextran show a continuous adsorption of SDS with increasing surfactant concentration leading to an increase of the viscosity and of the viscous part of the shear modulus of the solution. Only low elastic parts are detectable. In contrast, the behaviour of cellulose derivatives differs extremely with increasing amount of SDS. The viscosity and the elastic part of the shear modulus of aqueous solutions reach a well pronounced maximum and then drop almost to the initial values. A similar behaviour is also observed by adding the cationic surfactant hexadecyltrimethylammonium bromide. It is concluded that the observed differences in properties of the cellulose derivatives on the one side and derivatives of amylose and dextran on the other are cause by the structure of the polymer main chain, because the side groups for all of these polymers are comparable.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940606
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  • 10
    Electronic Resource
    Electronic Resource
    X-ray and optical investigations on polymers with mesogenic side groups (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 1189-1197 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Based on polarisation microscopic observation of polymers with mesogenic side groups at the phase transition isotropic-smectic, a domain-like structure has to be assumed for smectic phases. Two different regular-shaped nuclei are formed at the phase transition on slightly different conditions which grow after twinning into bǎtonnets. The Avrami equation can be applied for a quantitative description of the growth of the anisotropic areas as shown for one form of the nuclei. Unoriented and sheared samples maintain their morphology when cooled from the liquid-crystalline to the partially crystalline phase. The crystalline phase of polymers with mesogenic side groups was investigated by X-ray diffraction on differently oriented samples. It was found that the crystallites have the same internal structure despite the fact that they exhibit different uniaxial fibre axes. Optical investigations provide helpful supplementary information for deciding what kind of layered structure is present in the crystalline and smectic phase.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890520
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