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  • Articles  (6)
  • Polymer and Materials Science  (6)
  • 1990-1994  (6)
  • 1945-1949
  • 1
    Electronic Resource
    Electronic Resource
    Concentration of biological liquids by dialysis with modified acrylonitrile copolymer membranes (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 53 (1994), S. 729-733 
    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: Acrylonitrile copolymer membranes were subjected to partial hydrolysis in order to improve their dialysis characteristics. The partial hydrolysis time and temperature, as well as the concentration of the hydrolyzing agent, were the variable parameters. The changes in the chemical and physical characteristics of the membrane were proved by infrared spectroscopy, elemental analysis, differential scanning calorimetry, and Mercury intrusion porometry. After each degree of modification, the permeability of the membrane with respect to a solution of vitamin B12 was determined under static conditions and at temperature of 298 K. The improvement in the permeability at a definite degree of hydrolysis is explained by the conversion of nitrile groups to amide and carboxyl groups, as well as increase of the volume of the pores with average radius. The efficiency of the modified PAN membranes for concentration of biological liquids (diluted serum) was studied. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070530602
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of phosphorus-, zinc-, and chlorine-containing poly(ethylene terephthalate) (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 49 (1993), S. 777-784 
    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: Phosphorus-, zinc-, and chlorine-containing oligomer was used as a comonomer including ionic bonds in its molecules in the synthesis of poly(ethylene terephthalate). Phosphorus-, zinc-, and chlorine-containing poly(ethylene terephthalate) including ionic bonds in its main polymer chain was synthesized. With a content of 0.6% P and 1.25% Zn and 0.1% Cl, the resin has the following characteristics: ηrel = 1.407; COOH 39.90 mg equiv KOH/g 10-6; and mp 255.8°C. The modifier acts as a thermostabilizer. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070490503
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  • 3
    Electronic Resource
    Electronic Resource
    XPS study of laser-annealed ion-implanted GaAs (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 955-958 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Data on the effects of 140 keV Zn+ implanation of (100)GaAs and the consequent low-power pulsed laser annealing (LPPLA) on the composition of the surface layers are presented. The implantation does was 1014 cm -2 and the sample temperature was kept at 110 ± 10°C. THE LPPLA was carried out by 10-30 pulses of a Q-switched ruby laser (λ = 694.3 nm, τ = 25 ns and P0 = 4-6 MW cm-2) equipped with a spatial homogenizer. The crystal surface was studied by XPS analysis combined with depth profiling with the use of 1 keV Ar+.The results presented include the depth redistribution of oxygen and the As/Ga ratio as well as the oxide thickness for (a) virgin, (b) as-implanted and (c) implanted and then annealed samples.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740201205
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  • 4
    Electronic Resource
    Electronic Resource
    XPS study of amorphous As2S3 films deposited onto chromium layers (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 202-205 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: This paper reports some XPS data on unexposed and exposed thin films of As2S3 deposited onto chromium-coated glass substrates. We show the chemical changes on the surface and interface of As2S3 and chromium layers. The chromium layers are obtained by thermal evaporation, high-frequency sputtering and electron beam evaporation. Chemical changes of the sample surface after laser irradiation are investigated. Exposure of As2S3 films results in photo-induced oxidation of arsenic on the surface and formation of As2O3. It is established that the O 1s peak area on exposed samples decreases compared to the O 1s peak area on unexposed ones. This is related to desorption of As2O3 from the surface of exposed As2S3 layers. Another proof of desorption of As2O3 is the decrease of the As 3d/S 2p normalized peak area ratio on exposed As2S3 layers. The sulphur content on the surface remains unchanged after exposure of the samples, but its chemical surroundings change. An alteration of the chemical environment of As and Cr is observed at the As2S3/Cr interface, due to diffusion of chromium atoms through the interface into the As2S3 layer. This results in formation of an AsxCrySz compound at the As2S3/Cr interface, which dissolves with a lower rate. This hinders further etching of the metal coating during the photolithographic process employing Cr plates with inorganic photoresist based on vacuum deposited As2S3.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740220145
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  • 5
    Electronic Resource
    Electronic Resource
    XPS analysis of thin chromium filmsPaper presented at ECASIA 91, 14-18 October 1991, Budapest, Hungary. (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 18 (1992), S. 487-490 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The surface and mechanical properties of thin Cr films play an essential role in microphotolithographic processes in which an inorganic photoresist based on vacuum-evaporated As2S3 is used as a light-sensitive system. The present paper reports some XPS data about thin chromium layers obtained by thermal evaporation, high-frequency sputtering, electron beam evaporation and de magnetron sputtering. A correlation is found between the surface elemental composition of the metal coating and the metal coating and the possibilities of obtaining good adhesion between the Cr and As2S3 used as the inorganic photoresist. It is shown that the presence of pure Cr on the surface of the samples is a defining condition for photolithography in the submicron region.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740180705
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  • 6
    Electronic Resource
    Electronic Resource
    Rheological properties of acrylic latices (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 338-341 
    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: Die rheologischen Eigenschaften von durch Emulsionspolymerisation von Ethylacrylat, Methylmethacrylat und Acrylsäure erhaltenen Acrylat-Dispersionen wurden untersucht. Diese wäßrigen Dispersionen sind Nicht-Newtonsche pseudoplastische Flüssigkeiten, deren scheinbare Viskosität bei konstanter Schergeschwindigkeit sowohl vom pH-Wert des Mediums als auch von der Emulgatormenge und von der Menge des eingesetzten carboxylierten Agens abhängt. Die Anwendbarkeit der de-Broyn-Gleichung wurde geprüft, und die Quellungskoeffizienten wurden bestimmt.
    Notes: The rheological properties of acrylic latices obtained by emulsion polymerization of ethyl acrylate, methyl methacrylate, and methacrylic acid have been studied. These water dispersions are non-Newtonian pseudoplastic liquids, whose apparent viscosity at constant shear rate depends on the pH of the medium as well as on the amounts of the emulgator and carboxylated agent used. The applicability of the de-Broyn equation has been examined and the coefficient of swelling has been determined.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410606
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