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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 6872-6873 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 407-415 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Tertiary alkylamines of different chain lengths have been used as primers for adhesive bonding strength promotion for polyolefinic surfaces with cyanoacrylate (CA) adhesives. A combination of the construction of model polyolefin surfaces and advanced molecular-sensitive analysis tools has been employed for understanding the promoter/polyolefin interaction at the interface. Characterization of primer structure and interfacial properties has been carried out using grazing angle reflection-absorption Fourier transform infrared spectroscopy (GA/FTIR), ellipsometry, x-ray photoelectron spectroscopy (XPS) and contact angle titration using different pH probe liquids. Our work has focused on the design and construction of a model polyolefin surface using a new in situ polyethylene (PE) polymerization technique to form a controllable thickness (〈400 Å) of PE film on a reflective metal surface. The new technique of in situ PE polymerization is based on diazomethane chemistry. Both protonated and deuterated PE films have been successfully prepared. The results of spectroscopic investigations of these model deuterated and non-deuterated PE surfaces are disclosed. Molecular parameters that affect adhesion promotion have been studied. The parameters studied include molecular structure and alkyl chain length of tertiary alkylamines.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 276-288 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: We have observed that methacrylic acid (MA) is far more corrosive than acrylic acid (AA) on copper surfaces when copper was exposed to the vapor of these two acids at ambient temperature and environment. With the aid of modern surface-sensitive instrumentation, which included grazing angle Fourier transform infrared (FTIR), XPS, x-ray-induced Auger electron and SEM/energy-dispersive spectroscopies and white light stereo and metallurgical microscopy, we are reporting our results of an extensive study of the roles that MA and AA have in this unusual phenomenon of copper corrosion.By grazing angle FTIR analysis we demonstrated that copper carboxylate salt formation is very rapid upon short contact with the vapor of both acids, and the acids showed no evidence of polymerization. We have also demonstrated by XPS and x-ray-induced Auger electron spectroscopy that copper surfaces exposed to the MA vapor contains mainly Cu(II) species. However, the oxidation state of the copper exposed to AA vapor will depend on exposure time and environment. With limited exposure to the air, the copper surface remained shiny for up to 12 months test time. The spectrum obtained from the shiny area of the AA/Cu surface shows that it contains mainly Cu(I) mixed with some copper (II). When the spectrum was taken from a dull area of AA/Cu surfaces, the Cu(II) state was found to be predominant. These results strongly indicate that when the shiny AA/Cu surface changed to a dull color, the oxidation state of the copper also changed from +1 to +2. The molecular structure of the Cu(II)-AA salt is also believed to be altered.Both stereo microscopic and SEM/energy-dispersive spectroscopy techniques were also used to perform the visual and microanalysis of the surface texture and elemental compositions of the corroded surfaces, respectively. The presence of oxygen was also found to play an important role in the overall corrosion processes. The differences in molecular structure of copper carboxylate salts of different oxidation states are discussed and are believed to be responsible for this unusual phenomenon. We believe that this finding will provide a good explanation for the cause of drastic differences of copper corrosion by acrylic and methacrylic acids.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 199-208 
    ISSN: 0887-624X
    Keywords: real time FT-IR spectroscopy ; photopolymerization ; photoinduced anionic polymerization ; photoinduced catalytic hydrosilation reaction ; cyanoacrylate ; silicone hydrides ; vinyl silicones ; polymerization kinetics ; polyaddition reaction ; inorganic and organometallic photoinitiator ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The real time FT-IR (RT/FT-IR) technique has been recognized as a very vital tool to quantitatively study the curing parameters such as the effects of initiator (or catalyst) type and concentration, accelerator, stabilizer, irradiation wavelength, temperature, and curing environments. Herein, our results in studies of photoinduced polymerizations for adhesive and coating applications are reported. The photoinduced polymerizations studied included anionic and hydrosilation (a polyaddition polymerization) reactions. In photoinduced anionic polymerization our studies for ethyl cyanoacrylate polymerization are described. The effect of the concentration of photoinitiator and inhibitor on the ethyl cyanoacrylate polymerization kinetic rate will be discussed. In photoinduced catalytic hydrosilation reaction studies, the effects of the catalyst concentration and staging irradiation are disclosed. The hydrosilation reaction was monitored using a Si—H silicone hydride stretching band located at 2169 cm-1. The cyanoacrylate polymerization was monitored using the C=C stretching band occurring at 1617 cm-1. The hydrosilation conversion was completed with an appropriate formulation. For monofunctional cyanoacrylate monomer, the photoinduced conversion to straight chain polymer was approximately 85% for a 60 s period. The intrinsic rates of the reactions were calculated for kinetic comparisons. For very fast cyanoacrylate polymerization studies, new FT-IR kinetic software was used to collect 204 spectra/min. Some detailed experimental techniques and polymerization reaction mechanisms are also discussed. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
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  • 5
    Publication Date: 1998-07-01
    Print ISSN: 0024-9297
    Electronic ISSN: 1520-5835
    Topics: Chemistry and Pharmacology , Physics
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  • 6
    Publication Date: 1991-12-01
    Print ISSN: 0024-9297
    Electronic ISSN: 1520-5835
    Topics: Chemistry and Pharmacology , Physics
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