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  • 1
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Schlagwort(e): Chemistry. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (267 pages)
    Ausgabe: 1st ed.
    ISBN: 9783540498148
    Serie: Advances in Polymer Science Series ; v.141
    DDC: 541.2254
    Sprache: Englisch
    Anmerkung: Intro -- Progress in Polyimide Chemistry II -- Volume Editor -- Editorial Board -- Preface -- Contents -- Contents of Volume 140 -- Nanoporous Polyimides -- Introduction -- Criteria for High Temperature Polymer Continuous Phase -- Criteria for the Thermally Labile Coblock -- Synthesis and Characterization of Polyimide Copolymers -- Thin Film Processing Conditions -- Block Copolymer Morphology -- Foam Formation -- Porosity Determination -- Polyimide Nanofoam Morphology -- Properties of Polyimide Nanofoams -- Manipulation of Porosity Content -- Conclusions -- References -- Poly(ester-imide)s for Industrial Use -- Introduction -- History -- Saturated Poly(ester-imide)s for Wire Enamels -- Monomers -- Synthesis -- Wire Enamel Formulations -- Conventional Enameling of Poly(ester-imide) Wire Enamels -- New Enameling Technologies -- Other Poly(ester-imide) Wire Enamels -- Unsaturated Poly(ester-imide)s -- Imide Modified Alkyd Resins -- Imide Modified Coatings -- Thermoplastic Poly(ester-imide)s -- Other Application Areas -- Conclusions and Outlook -- References -- Liquid-Crystalline Polyimides -- Introduction -- Stereochemistry of Aromatic Imides -- Aromatic Poly(ester-imide)s (PEIs) -- Symmetrical Imide Building Blocks -- Non-Symmetrical Imide Building Blocks -- Poly(ester-imide)s Containing Aliphatic Spacers -- Short Symmetrical Imide Mesogens -- Long Symmetrical Imide Mesogens -- Non-Symmetrical Imide Mesogens -- Cholesteric Poly(ester-imide)s -- Chiral "Sulfide Spacers" -- Sugar Diols as Chiral Building Blocks -- Chiral Terephthalic Acids -- Various LC-Polyimides -- Characterization of Layer Structures -- General Considerations -- Problems and Experimental Results -- References -- Calculation of a Mesogenic Index with Emphasis Upon LC-Polyimides -- Introduction -- Review of LCPs Containing Imide Groups. , Poly(esterimide)s (PEIs) with Aliphatic Spacers -- Wholly Rigid Aromatic PEIs -- Poly(amide-imide)s -- Polyimides -- Poly(etherimide)s -- Structure and Theoretical Aspects of Main-Chain LCPs -- Effects of Chemical Structure on Liquid Crystallinity -- Theoretical Aspects of Main-Chain LCPs -- Prediction of Mesophases in Copolymers -- The Mesogenic Index (MI) -- Individual Group Contributions -- Determination of Critical MI Values -- Polyesters, Polyamides, Poly(esteramide)s -- Polycarbonates -- Polyimides and Polyetherimides -- Application of MI to Copolymers Containing Imide Groups -- Copoly(etherimide)s -- Copoly(amide-imide)s -- Copoly(esterimide)s (PEIs) -- PEIs Based on Trimellitic Anhydride -- Polyesterimides Based on Imide Diphenol -- PEIs Derived from Pyromellitic Anhydride -- PEIs Based on Linked Biphenyltetracarboxylimide -- PEIs Containing Bisphenyl Tetra-imide.(BPTA) -- PEIs from N-(4-Carboxyphenyl) 4-Nitrophthalimide -- Copoly(imide-carbonates) -- References -- Author Index Volumes 101-141 -- Subject Index.
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 5 (1968), S. 0 
    ISSN: 1469-8986
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: SC and SP were measured simultaneously from opposite hands during a stress period and a subsequent prolonged relaxation in 19 Ss. With the Ss relaxed, toward the end of the session, simultaneous measures of SC and SP were taken between various combinations of two active and two drilled reference electrodes on both hands. It was found that SC measured with the external voltage connected in series-adding with the endogenous SP (i.e., positive pole to the active electrode) was some 13 percent higher than when measured in reverse polarity. Supplementary experiment showed that this‘rectification effect’ could be entirely attributed to the effect of the endogenous potential. A method of estimating SC from SP readings with no external current source was shown to give results equivalent to values measured in the usual way. These and other findings support the claim that steady-state electro-dermal properties fit a simple model consisting of a variable voltage and a variable resistance in series. Within-subject correlations of SC and SP were high for Ss with low average SCs, lower for high-SC Ss who seemed less able to relax. The data suggest that SP may be an inverted-U shaped function of arousal and perhaps that the‘beta process,’ which drives the tonic SP downward with increasing arousal, may begin to function at much lower levels of arousal for some Ss than for others. Phasic responses obtained at the end of the session when some Ss were apparently asleep suggest that, when S is drowsy or in light sleep, both the SCR and the SPR have lengthened and variable latencies, and the SPR is uniformly a large, negative going (alpha) response. Uniphasic beta SPRs were rather consistently obtained when the pre-stimulus tonic SP was already high.
    Materialart: Digitale Medien
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  • 3
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Macromolecules 20 (1987), S. 1167-1169 
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Macromolecules 23 (1990), S. 3870-3872 
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 5068-5075 
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8471-8479 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The orientational decay of chemically and thermally stable high-temperature chromophores doped into thin films made from polyimides and a variety of other polymeric hosts has been investigated. The chromophores are aligned using electric field poling and second-harmonic generation (SHG) is used to probe the decay of the electric field poling induced alignment. The decay rate of the SHG signal from films poled using both a corona discharge and side-by-side in-plane electrodes was measured. When electrodes are chosen so that the effects of charge injection are minimized, little difference has been observed between the orientational decays from films poled using the two methods for either an amorphous preimidized polyimide host or a highly anisotropic film poled during imidization. The films imidized during poling showed significant orientational stability at 250 °C for over 15 h after a fast initial partial decay. In addition, the decay of the SHG signal was measured as a function of temperature below the glass transition in a wide variety of different polymer host systems. The temperature dependence of the decay was found to be non-Arrhenius, but could be strongly correlated with the glass transition temperature of the guest-host system using an empirical relationship similar to the Williams–Landel–Ferry or Vogel–Tamann–Fulcher equation.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2296-2299 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Studies of photogeneration of charge in polysilanes resulting from multiple pulse excitation in thermally stimulated current (TSC) measurements are reported. The amount of charge that was photogenerated at 80 K and collected during the heating of the sample up to 300 K, ranged from 1×10−9 to 4×10−8 C/cm2 for electric fields of 10–30 V/μm and illumination energy up to 2.5 mJ/cm2 and was found to be dependent both on the electric fields applied during illumination and thermal ramping and on the illumination energy. The results are compared to an idealized model that qualitatively describes for photogeneration of the charge at 80 K and its collection during the TSC measurement. According to this model, multiple pulse excitation at 80 K leads to a buildup of photogenerated charge density in the surface region of the sample and as the temperature is increased, electron-hole recombination occurs, limiting the amount of charge collected by the external circuit.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 410-417 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In order to develop nonlinear optical chromophores for frequency doubling applications, it is important to understand the magnitudes of the relevant chromophore properties that will be required. In this paper the use of organic polymers with attached optically nonlinear chromophores to form waveguide second-harmonic-generation devices will be discussed. In particular, the use of such a frequency doubling device in optical storage applications will be considered. To this end limits on the quantity μβ are obtained where μ is the dipole moment and β the hyperpolarizability. Experimental values for electron donor/acceptor-substituted benzenes, stilbenes, and tolanes are compared to these requirements. None of the chromophores treated here have both sufficiently high optical nonlinearity and sufficiently low optical absorption at a doubled optical frequency of 400 nm to be practical in the specific application described.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 7413-7422 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Unoriented and highly oriented films of poly(di-n-hexylsilane) have been studied by Raman scattering, wide angle x-ray diffraction and optical absorption measurements. From a comparison of group theoretical predictions with those bands observed in the Raman experiments and from the x-ray layer line spacing from an oriented sample, a planar zig–zag conformation for the silicon backbone was deduced. X-ray reflections were suitably indexed by a monoclinic unit cell containing two molecules. Polarized Raman studies on uniaxially oriented samples also revealed that the hexyl side chains are not orthogonal to the silicon backbone but may be slightly tilted in order to minimize intramolecular steric interactions.
    Materialart: Digitale Medien
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