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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 216-216 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 114-119 
    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: γ-radiolysis of poly(methyl methacrylate) (PMMA) and chlorosubstituted poly(methacrylates) gives radicals with comparable nine-line-EPR spectra. The transformations of the molecules were discussed in light of the quantitative differences in the accumulation processes. EPR-spectra at liquid helium temperatures confirm the hypothesis of allyl radical accumulation in PMMA.
    Notes: Die im Poly(methylmethacrylat) (PMMA) und in chlorsubstituierten Poly(methacrylaten) radiolytisch erzeugten Radikale ergeben ähnliche EPR-Neunlinienspektren. Molekülumwandlungen zur Deutung der quantitativ unterschiedlichen Akkumulationsprozesse werden diskutiert. EPR-Spektren bei Heliumtemperaturen bestätigen die Hypothese der Akkumulation von Allylradikalen im PMMA.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 371-374 
    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: XPS investigations and determination of the electron beam sensitivity revealed a crosslinking mechanism via halogen elimination. The crosslinking effect is higher with an admixture of bisazide. The halogen elimination induced by irradiation of the 4-halogenphenol novolac resists increases in the order fluorine, chlorine, bromine, iodine.
    Notes: XPS-Untersuchungen und die Bestimmung der Elektronenstrahlempfindlichkeit an Halogenphenolnovolak-Resistschichten ergaben, daß ein Vernetzungsmechanismus über Halogeneliminierung abläuft. Durch Bisazidzusatz wird der Vernetzungseffekt erhöht. Die strahlenchemisch induzierte Halogeneliminierung der untersuchten 4-Halogenphenolnovolake steigt in der Reihenfolge Fluor-Chlor-Brom-Iod.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 44 (1993), S. 148-151 
    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 Herstellung von Polymer-Metall-Precursors, ihr thermoanalytischer Abbau sowie ihre Umwandlung zu hochtemperatursupraleitenden Y-Ba-Cu-O- bzw. Bi-Sr-Ca-Cu-O-Verbindungen werden beschrieben. Die dünnen Precursorfilme wurden mittels Elektronenstrahllithographie strukturiert und danach in die HTS-Phasen überführt.
    Notes: We report on the preparation of polymer metal precursors, their thermoanalytical degradation and their transformation to high temperature superconducting (HTS) Y-Ba-Cu-O or Bi-Sr-Ca-Cu-O compounds. The thin precursor film was patterned by electron beam lithography and subsequently transformed to HTS phases.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 2669-2681 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymers of α-chloroacrylate (MCA), 1-chloroethyl methacrylate (1CEMA), 2-chloroethyl methacrylate (2CEMA), 2,2,2-trichloroethyl methacrylate (trCEMA) and 1,2,2,2-tetrachloroethyl methacrylate (teCEMA) were γ-irradiated at 77 K. The primary radicals were generated by the abstraction of chlorine. They decay or change into chain end radicals upon warming up to room temperature.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 98-103 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Reaktion von Ferrocenalkoholen mit Phenyl- und Methylisocyanat wird untersucht. Bei Durchführung der Umsetzungen bei Zimmertemperatur entstehen in normaler Reaktion die entsprechenden Urethane, während bei erhöhter Temperatur vorwiegend tertiäre, Ferrocenylalkylgruppen enthaltende Amine synthetisiert werden. Der Bildungsmechanismus der N, N-Bis-ferrocenylalkyl-arylamine wird diskutiert.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diallylterephthalat wurde ohne Lösungsmittel bei 80°C und mit Benzoylperoxid als Initiator polymerisiert. Es wird ein linearer Zusammenhang erhalten, wenn man VBr/[I]0,5 gegen die Wurzel aus der Initiatorkonzentration aufträgt. Die funktionelle Abhängigkeit wird aus dem Reaktionsmechanismus heraus auch kinetisch abgeleitet.Die Zerfallskonstante kd des Benzoylperoxides in Diallylterephthalat bei 80°C wurde nach der Methode der dead-end-Polymerisation bestimmt und aus der funktionellen Beziehung zwischen VBr/[I]0,5 und [I]0,5 berechnet. Die erhaltenen Werte für die Konstante stimmen gut überein.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 27 (1965), S. 6-17 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Synthesemöglichkeiten für Hydroxyarylferrocene werden untersucht, einige Methoxy- und Hydroxyarylferrocene werden dargestellt. Die Ätherspaltung von Methoxyarylferrocenen gelingt nicht mit den üblichen Ätherspaltungsreagenzien, wohl aber mit ätherfreiem Methylmagnesiumjodid. Bis-1,1′-hydroxyarylferrocene sind als Ausgangsprodukte für die technische Herstellung von Polykondensationskunststoffen ungeeignet, weil sie nur in zu schlechten Ausbeuten zugänglich sind.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 936-941 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1-Acylsemicarbazide reagieren in Dimethylsulfoxid/Kaliumhydroxid mit molekularem Sauerstoff unter Abspaltung von Stickstoff, Kohlenmonoxid und Wasser zu N-substituierten Carbonsäureamiden. Die Umsetzung verläuft wahrscheinlich über die Zwischenstufe der instabilen Azoverbindungen. Durch ein Kreuzungsexperiment wurde festgestellt, daß die Carbonsäureamidbildung zumindest teilweise intermolekular über Bruchstücke erfolgt.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 297-301 
    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: Copolymers of methyl methacrylate with methacrylic acid [P(MMA/MA)] are interesting resist materials for microlithography. At moderate baking temperatures, these copolymers undergo an intramolecular cyclization, yielding terpolymers containing anhydride moieties. This process has striking consequences for the dissolution behavior and results in higher ketone solubilities. The dissolution rates in methyl ethyl ketone (MEK) and in mixtures with ethyl glycol (EG) correlate in an Arrhenius-like manner with the reciprocal baking temperatures. Two distinct temperature ranges with different slopes between 130-180°C and 180-230°C are found. This is in good agreement with other findings, indicating a different mechanism of anhydride formation in these temperature regions. The activation energies for the dissolution of P(MMA/MA) in EG or EG/MEK mixtures are about 17 kcal/mol and those of the thermally treated material in MEK or MEK/EG or mixtures of MEK with methyl isobutyl ketone (MIBK) are in the range of 20-30 kcal/mol. For the investigation of the Mn dependence, γ-irradiated probes of the copolymer were used. We obtained the usual exponential Mn dependence with an exponent of 0.7-0.8 in MIBK and 0.3-0.4 in EG. Our findings are in agreement with a “relaxation-controlled” dissolution behavior, especially for the anhydride-containing terpolymer. No residual layers or pronounced inhibition periods indicative for gel-layer formation, however, could be found. We suggest a normal dissolution process with a very small gel layer. For the copolymer in an alcohol-containing solvent, a stress-driven dissolution behaviour is more likely. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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