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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and Properties of Polypropylene/Polypyrrole Composite (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 191 (May 1995), p. 47-52 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.191.47.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Interface Characterization of Immiscible Polymer Blends by Means of XR and NR Investigations (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 321-324 (Jan. 2000), p. 475-480 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.321-324.475.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlinear optical side-chain polymer with high thermal stability and its pyroelectric thermal analysis (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2018-2020 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stable polymers with nonlinear optical side groups were synthesized from maleic anhydride copolymers and the azo dye Disperse Red 1 via esterification. After electrode poling under 135 V/μm at 185 °C, thermal stabilities were measured by pyroelectric and electro-optic thermal analysis and compared to a guest/host polymer of polymethylmethacrylate and the same dye. The pyroelectrically detected dipole orientation and the electro-optic activity of the side-chain polymers decreased only above 150 °C, and electro-optic r33 coefficients of up to 6 pm/V were achieved at 780 nm even without optimizing the dye content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110630
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  • 4
    Electronic Resource
    Electronic Resource
    Self-Organization in Semifluorinated Polymers (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 443-444 (Jan. 2004), p. 223-226 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Alkyl-perfluoroalkyl compounds are known to form a microphase-separated structure due to the thermodynamic immiscibility between the fluorinated and the protonated segments [1,2]. Many similarities between bulk and surface structures of such polymers were found in the past [2,3,4] which can be explained by both microphase separation in the bulk as well as surface segregation of the fluorinated parts. Basing on this concept, polymers with chemically different main chains were attached with alkylperfluoroalkyl side chains (particularly, oxydecylperfluorodecyl chains, -O-(CH〈sub〉2〈/sub〉) 〈sub〉10〈/sub〉-(CF 〈sub〉2〈/sub〉) 〈sub〉9〈/sub〉-CF 〈sub〉3〈/sub〉). Combined investigations by means oftemperature-dependent X-ray scattering, molecular modeling and DSC measurements were performed to characterize the bulk structure in dependence on the flexibility of the main chain as well as the density of side chains. The polymers under investigation show one or more phase transitions in the temperature range from room temperature to 300 °C which can be assigned as transitions between different smectic structures. These phases are characterized to have positive aswell as negative expansion coefficients, respectively, indicating changes of the tilt angle of the side chains and/or the degree of interdigitation. The polymer melts feature a high memory behavior evidenced by reversed imaging of the scattering patterns in the heating and cooling runs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.443-444.223.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Bulk and Surface Structure of Semifluorinated Polyesters (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 378-381 (Oct. 2001), p. 378-382 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.378-381.378.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Die charakterisierung der porosität von polyacrylnitril-faserstoffen im gelzustand (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 151-158 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Measurement methods that are applicable for the characterization of porous structures, i.e. differential scanning calorimetry, low-temperature gas adsorption, mercury high pressure porosimetry, electron and light microscopy, X-ray small angle scattering, water retention value, and apparent density, are described with respect of the peculiarities of poly(acrylonitrile) fibres. The methods have been applied on differently stretched and thermally treated PAN fibres in the gel state and after dehydration, respectively. The observed effects are explained by the different stabilities of the gel fibre structure.
    Notes: Die zur Charakterisierung von Porenstrukturen anwendbaren Meßmethoden Differential-Scanning-Calorimetrie, Tieftemperatur-Gasadsorption, Quecksilber-Hochdruckporosimetrie, Elektronen- und Lichtmikroskopie, Röntgenkleinwinkelstreuung sowie Wasserrückhaltevermögen und scheinbare Dichte werden unter Berücksichtigung der Besonderheiten von Polyacrylnitrilfasern vorgestellt. Die genannten Methoden wurden auf unterschiedlich gereckte und thermisch behandelte PAN-Fasern im Gelzustand und nach Entwässerung angewendet. Die dabei auftretenden Effekte werden mit der unterschiedlichen Stabilität der Gelfaserstruktur erklärt.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430305
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and properties of polyamidines (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 929-938 
    Details
    ISSN: 0887-624X
    Keywords: polyamidines ; chain conformation ; hydrogen bonds ; prototropic tautomerism ; thermal stability ; hydrolytic stability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymers with amidine groups —NH—CR=N— in the main chain were prepared by acid catalysed melt polycondensation of 4,4′-diaminodiphenyl methane (DAPM) with various orthoesters. The resulting polyamidines were characterized by 1H-, 13C- and 15N-NMR spectroscopy, differential scanning calorimetry (DSC), thermogravimetry (TGA) and wide angle x-ray scattering (WAXS) measurements. The properties of the polyamidines are strongly determined by the substituent R on the amidine group. Some peculiarities of the polyformamidine (R=H) could be attributed to the conformation of the amidine group. Glass transition temperatures varied from 106 to 161°C depending on the substituent R. All polyamidines possessed good thermal stability up to 370°C and, with exception of the polyformamidine, good solubility in common solvents. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 929-938, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Investigations of the equilibrium melting temperature in PBT and PC/PBT blends (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 211-219 
    Details
    ISSN: 0887-6266
    Keywords: polycarbonate ; poly(butylene terephthalate) ; blends ; isothermal crystallization ; differential scanning calorimetry (DSC) ; melting behavior ; equilibrium melting temperature ; Hoffman-Weeks plot ; transesterification ; miscibility ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The melting behavior of poly(butylene terephthalate) and its blends with bisphenol-A polycarbonate was investigated with differential scanning calorimetry. The aim of this work was to determine the equilibrium melting temperature and its dependence on the blend composition using the Hoffman-Weeks plots. It is shown that the critical analysis of various influences on the melting peak is necessary for the reorganization processes and crystallized content of blends. The experimental conditions and the corrections of measured temperatures were derived and discussed. It was found that the use of the extrapolated onset temperature Tm,o of the melting peak is more efficient than the maximum temperature Tm for the Hoffman-Weeks plots. The equilibrium values of pure PBT are determined to be Tom,o = 501 K and Tom = 506 K. The equilibrium temperatures of the blends do not show a depression with increasing PC content. Using the Nishi-Wang relation, the results can be qualitatively interpreted with a polymer-polymer interaction coefficient χ ≥ 0 between both components. A weak increase in the equilibrium temperature with increasing PC content was observed. A hypothesis to explain this is based on the possibility of a changed population of the different spherulites with various melting temperatures in dependence on PC content. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Investigations of transesterification in PC/PBT melt blends and the proof of immiscibility of PC and PBT at completely suppressed transesterification (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 2161-2168 
    Details
    ISSN: 0887-6266
    Keywords: polycarbonate ; poly(butylene terephthalate) ; melt blends ; differential scanning calorimetry (DSC) ; nuclear magnetic resonance (NMR) ; miscibility ; immiscibility ; transesterification ; glass transition temperature ; melting temperature ; copolyester ; compatibility ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The miscibility of polycarbonate PC and poly(butylene terephthalate) PBT is controversially discussed in the literature. Partial miscibility has been generally found in melt blends of the two polymers. However, in solution cast blends they were found to be immiscible. It is known that the transesterification takes place in the melt. Copolyesters formed by the transesterification change the compatibility of PC and PBT. In this work PC/PBT melt blends of various composition were investigated in dependence on the copolyester content by means of DSC and NMR. It can be shown that the time regime of the thermal treatment in the melt determines the transesterification degree. The PBT crystallization behavior is strongly influenced by both the PC and copolyester content. The glass transition temperatures of the PBT-rich and PC-rich phase approach each other with the increasing copolyester content. The analysis of the glass transition behavior permits the conclusion that PC and PBT are inherently immiscible provided that the copolyester content is exactly zero. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2161-2168, 1997
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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