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  • 1
    Electronic Resource
    Electronic Resource
    Use of cobalt complexes as activators in emulsion copolymerization of butadiene and styrene (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 181-194 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Cobalt complex compounds exhibited varying degrees of activation and retardation in butadiene-styrene-soap emulsion polymerization systems at 20-50°C. An accompanying effect was the wasting of modifier, particularly by large concentrations of activator. The most active complexes for use with dodecyl mercaptan were those in which the cobalt was coordinated with two or more negative groups other than thiocyanate, and in which the neutral coordinated groups were not ethylenediamine.
    Additional Material: 17 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030205
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  • 2
    Electronic Resource
    Electronic Resource
    13C-NMR of ABS in the solid state. Characterization and relaxation studies (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 3285-3296 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C-NMR spectra of bulk acrylonitrile-butadiene-styrene (ABS) resin are reported. The styrene-co-acrylonitrile (SAN) carbons can be observed selectively by using high-power proton decoupling, cross polarization, and magic angle spinning (MAS). The polybutadiene (PBd) carbons can be observed selectively by using low-power proton decoupling, with or without MAS. Methods and conditions for using 13C-NMR to quantify the amount of PBd in solid ABS resins are developed. The 13C-NMR results and results from iodine monochloride titrations for PBd content are in good agreement. Resonances of PBd in ABS in the solid state are assigned on the basis of triad sequences of cis, trans, and vinyl-1,2 geometric isomers of butadiene. Computational methods are set forth for measuring directly from the 13C-NMR spectra the percent of cis, trans, and vinyl-1,2 isomers in PBd in the ABS resin. The NMR measurement of PBd microstructure appears to be preferable to infrared (IR) determinations. Relaxation parameters (T1 and NOE) are reported for PBd in bulk ABS as a function of temperature and are analyzed in terms of a distribution of rotational correlation times. These relaxation parameters are similar to those of nongrafted PBd and indicate that the local motions in grafted and nongrafted PBd are similar.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170201203
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallinity in equimolar highly alternating butadiene-methyl methacrylate copolymers (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 10 (1972), S. 799-804 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.130101008
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  • 4
    Electronic Resource
    Electronic Resource
    An investigation of the effects of the molecular weight distribution on the sensitivity of positive electron resists (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 2367-2375 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The molecular weight distribution of two grades of poly(methyl methacrylate) was determined, and the solubility of that polymer in methyl ethyl ketone-2-propanol mixtures was studied. The effects of the molecular weight distribution of the polymer and the strength of the developing solvent on electron resist sensitivity were studied experimentally and compared with a computer model of the electron exposure process. The molecular weight and the molecular weight distribution were found to have a significant effect on the sensitivity of poly(methyl methacrylate) as an electron resist. Increased sensitivity is predicted for higher molecular weight and narrower molecular weight distribution.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200907
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  • 5
    Electronic Resource
    Electronic Resource
    The curing reaction of an epoxide resin with 2-ethyl-4-methylimidazole, a calorimetric study of the kinetics of formation of epoxide-imidazole adducts (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 919-930 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Kinetik der Bildung von 1:1 und 2:1-Addukten (bezogen auf die Äquivalente Epoxid) von 2,3-Epoxipropyloxybenzol (2) und 2,2-Bis[p-(2,3-epoxypropyloxy)phenyl]-propan (1) mit 2-Äthyl-4-methylimidazol (3) wurde mit Hilfe der Differentialkalorimetrie (DSC) untersucht. Ein Vergleich isothermer und dynamischer Werte des 1:1-Systems 2/3 zeigte, daß die dynamische Geschwindigkeit nicht einfach mit der isothermen Geschwindigkeit gleichgesetzt werden kann, wohingegen die wahre dynamische Geschwindigkeitsgleichung dα/dt = (∂α/∂tT)+(∂α/∂Tt) (dT/dt), gute Übereinstimmung mit den isothermen Werten ergab. Die dynamischen DSC-Messungen deuten darauf hin, daß alle Reaktionen angenähert nach der 1. Ordnung verlaufen und ähnliche Werte für die Aktivierungsenergie (E = 81-93 kJ/mol) und den Frequenzfaktor (log A ≈ 9-10) ergeben. Die Ergebnisse stützen den Vorschlag, daß die Adduktbildung wahrscheinlich die erste Stufe der durch 3 katalysierten Harzvernetzung darstellt.
    Notes: The kinetics of formation of the 1:1 and 2:1 adducts of (in terms of equivalents of epoxide) 2,3-epoxypropyloxybenzene (2) and 2,2-bis[p-(2,3-epoxypropyloxy)phenyl]-propane (1) with 2-ethyl-4-methylimidazole (3) have been investigated by differential scanning calorimetry (DSC). A comparison of isothermal and dynamic data for the 1:1 system 2/3 showed that the dynamic rate cannot simply be equated to the isothermal rate, but the true dynamic rate equation, dα/dt = (∂α/∂tT)+(∂α/∂Tt) (dT/dt), gave good agreement with the isothermal data. The dynamic DSC measurements indicate that all of the reactions approximate to first order kinetics and have similar values for activation energy (E = 81-93 kJ/mol) and pre-exponential factor (log A ≈ 9-10). The results support the suggestion that adduct formation is likely to be the first stage of the resin curing reaction catalyzed by 3.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760408
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  • 6
    Electronic Resource
    Electronic Resource
    Conformation of poly(dimethyl siloxane) and polystyrene in solution measured by polarized Raman scattering (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 997-1009 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Depolarization ratios ρ have been measured over ranges of temperature T and molecular weight M for polystyrene (PS) dissolved in cyclohexane (1002 cm-1 Raman band) and for poly(dimethyl siloxane) (PDMS) dissolved in benzene (2907 cm-1 Raman band). The ranges in the case of PS are 15 〈 T 〈 65°C and 2 × 103 〈 M 〈 4 × 105 and in the case of PDMS are -3 〈 T 〈 60°C and M = 104. Measurements were also made of PDMS radii of gyration using conventional light scattering. The results are interpreted in terms of a theory connecting rotational isomeric populations with polymer extension. In the case of PDMS, an experimental value of the proportionality constant for trans isomers (D2 = -3.9 ± 0.9) is deduced. This is closer to the theoretical value than previous estimates but there is still some discrepancy. In the case of PS the isomeric changes resulting from extension are independent of M for M 〉 104. Deviations are observed for lower M.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.180130512
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  • 7
    Electronic Resource
    Electronic Resource
    A study of helix formation in polydimethysiloxane by Raman scattering (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 643-650 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Depolarization ratios ρ of the Raman bands due to CH3 stretching at 2907 cm-1 and the Si—O skeletal mode at 491 cm-1 have been measured in polydimethylsiloxane gum as a function of temperature from 100°C to -45°C. Below 0°C the changes in p have been interpreted in terms of the formation of helical regions in the gum. The enthalpy of helix formation ΔH has been determined as 3200 ± 600 cal/mole. An upper limit on the entropy change, ΔS, of 16 ± 3 e.u./mole and minimum values of helix content at different temperatures have been found. The Raman spectrum of crystalline polydimethylsiloxane is presented.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180140406
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  • 8
    Electronic Resource
    Electronic Resource
    Raman depolarization measurements over the entire miscible range for polystyrene-cyclohexane and polydimethylsiloxane-benzene solutions: Determination of upper theta temperatures (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 97-102 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman depolarization ratio measurements (ρ) have been made for 20% polydimethylsiloxane (PDMS) solutions in benzene and 10% Polystyrene (PS) solutions in cyclohexane over the temperature range 20 〉 T 〉 200°C. The bands studied were the 2907 cm-1 methyl stretch in PDMS and the 1002 cm-1 ring breathing mode in PS. The measured ρ are related to rotational isomeric state populations and a qualitative picture of the polymer conformation changes over much of their miscible ranges is described. Measurements of ρ for PDMS gum over the temperature ranges 20 〈 T 〈 200°C have been obtained and the upper theta temperature has been determined to be 171 ± 3°C for PDMS/benzene. Quantitative information about the variation of the polymer solvent interaction parameter χ can in principle be obtained.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.180150108
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  • 9
    Electronic Resource
    Electronic Resource
    Polarized Raman scattering of concentrated solutions of poly(dimethyl siloxane) in benzene (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1339-1345 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman depolarization (ρ) measurements have been made over the temperature range 20 〉 T 〉 60°C for solutions of poly(dimethyl siloxane) (mol wt 7.7 × 104 and 2.0 × 104) for several concentrations up to 100%. The band studied was the highly polarized methyl stretch at 2907 cm-1. Computer calculations of the probability pt of a rotational isomer being trans allow the ρ values to be related to ΔG, the free energy of mixing. ΔG is plotted as a function of concentration and minima are observed at 60 ± 3% (mol wt = 7.7 × 104) and 70 ± 3% (mol wt = 2 × 104).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.180150803
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  • 10
    Electronic Resource
    Electronic Resource
    Development of in situ blends of poly(p-oxybenzoate-co-p-phenyleneisophthalate) with other thermotropic liquid crystalline polymers (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 53 (1994), S. 575-586 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A new in situ polymerization method is discussed wherein monomers of the major component are polymerized in the presence of a preformed thermotropic liquid crystalline polymer (LCP). Poly(p-oxybenzoate-co-p-phenyleneisophthalate) (HIQ) was chosen for this study. HIQ is well known to have a narrow process window and to be difficult to process reproducibly, both drawbacks for a commercial product. An in situ polymerization of the HIQ monomers in the presence of a fully polymerized LCP, such as poly(4-oxybenzoate-co-6-oxy-2-naphthoate) (CO) results in the “CO-HIQ” in situ blend. The in situ blend exhibited reduced biphasic morphology and was more homogeneous than was HIQ. The glass fiber-filled CO-HIQ resin also featured improved melt flow and more reproducible mechanical properties than those of HIQ. The in situ blends were characterized by optical microscopy, 1H-NMR, and melt rheology. The effect of the LCP level on the morphology of the in situ blend is discussed. © 1994 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070530510
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