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  • 1990-1994  (8)
  • Polymer and Materials Science  (7)
  • dilatometry  (2)
  • Pseudomonas fluorescence
  • 1
    Electronic Resource
    Electronic Resource
    Reatarding effect of nitrogen ylide for the polymerization of N-vinyl pyrrolidone (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 645-648 
    Details
    ISSN: 1435-1536
    Keywords: β-picolinium-p-chlorophenacylide ; α-α azobisisobutyronitrile ; N-vinyl pyrrolidone ; dilatometry ; retarder ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract β-Picolinium-p-chlorophenacylide (β-PCFY) acts as a retarder for polymerization of N-vinyl pyrrolidone. The polymerization runs were carried out at 60°C using benzene as an inert solvent. The kinetic equation for the present system may be written asR p α[β-PCPY]−1.0 [AIBN]0.66[N-VP]1.0. The value of overall energy of activation for polymerization in presence and absence ofβ-PCPY was computed as 44.0 and 42.3 kJ mol−1, respectively. The inverse relationship ofR p and¯M v withβ-PCPY suggests thatβ-PCPY acts as a polymerization retarder. The retarding effect is also evidenced by higher initiator exponent value and higher value of energy of activation in presence of ylide. A mechanism is also proposed in which polymer propagating chain combines with one ylide component to give resonance stabilized radical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410406
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of epoxy resins containing chromium acrylate (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 219 (1994), S. 1-10 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Umsetzung von Chromacrylat mit Bisphenol A und einem Überschuß Epichlorhydrin wurden neuartige Epoxid-Harze hergestellt. Epoxy-Äquivalentgewicht, Gehalt an Hydroxygruppen und hydrolysierbarem Chlor sowie die Viskosität wurden bestimmt, und die Harze wurden mittels IR- und 1H-NMR-Spektroskopie charakterisiert. Die thermischen Eigenschaften der bei 30°C für 24 h mit Ciba Geigy HY 850 (aliphatisches Amin) gehärteten Harze wurden gemessen. Die Harze besitzen eine gute thermische und chemische Stabilität und eine gute elektrische Leitfähigkeit. Die Reaktion verläuft nach erster Ordnung; die Aktivierungsenergie beträgt 47 kJ mol-1 bzw. 34 kJ mol-1 mit bzw. ohne Chromacrylat. Aus spektroskopischen Untersuchungen wird geschlossen, daß das Chrom mit Bisphenol A einen Komplex bildet, der die Epoxidierung beschleunigt.
    Notes: Novel epoxy resins containing chromium acrylate have been synthesized by reacting chromium acrylate with bisphenol-A and excess epichlorohydrin. The quantities such as epoxy equivalent weight, hydroxy content, hydrolyzable chlorine content and viscosity have been determined. The resins have been characterized by IR and 1H NMR spectroscopy. The cured resins were evaluated for thermal properties. The curing of resins was carried out with Ciba Geigy HY 850 (aliphatic amine adduct) at 30°C for 24 h. The cured resins have excellent thermal and chemical resistance, in addition to an excellent electrical conductivity. The reaction follows first order kinetics with an activation energy of 47 kJ mol-1 and 34 kJ mol-1 in the presence and absence of chromium acrylate, respectively. The chromium forms a complex with bisphenol-A, as indicated by spectroscopic studies, which increases epoxidation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052190101
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  • 3
    Electronic Resource
    Electronic Resource
    Copolymerization of zinc acrylate with acrylonitrile initiated by As2S3-styrene complex (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 34 (1994), S. 105-109 
    Details
    ISSN: 0959-8103
    Keywords: Zinc acrylate ; acrylonitrile ; As2S3-styrene complex ; copolymerization ; dilatometry ; kinetics ; 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: Radical copolymerization of zinc acrylate (ZnA2) with acrylonitrile (AN), initiated by As2S3-styrene complex(I), in dimethyl Sulphoxide (DMSO) at 90 ± 0.1°C for 1.0h under inert atmosphere, yields non-alternating copolymers. The kinetic expression is Rp ∝ [I]0.33 [ZnA2]0.25 [AN]0.44, i.e. the system follows non-ideal kinetics, which is due to primary radical termination as well as degradative chain transfer reactions. The values for activation energy (E) and k2p/kt are 128kJ mol-1 and 8.57 × 10-7 litre mol-1 s-1, respectively. Thermal stability, solubility in different solvents, and IR and NMR spectra have been evaluated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210340114
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  • 4
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks: A review on synthesis and properties (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 35 (1994), S. 109-118 
    Details
    ISSN: 0959-8103
    Keywords: Interpenetrating polymer networks ; synthesis ; properties ; mechanism ; structure-property relationship ; 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 review containing 83 references on the chemistry aspects (mechanism and structure-property relationships) for IPN synthesis is presented.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210350201
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  • 5
    Electronic Resource
    Electronic Resource
    Spontaneous current emission in metal-ferrocene-doped ethyl cellulose-metal systems (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 35 (1994), S. 153-159 
    Details
    ISSN: 0959-8103
    Keywords: spontaneous current emission ; activation centres ; barrier polarization ; plasticization effect ; 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: Spontaneous current emission (SCE) has been studied in sandwiched different electrode configurations [metal(1)-undoped/doped ethyl cellulose (EC)-metal (1)/(2)] as a function of heating rate, film thickness and dopant concentration in the temperature range 40-200°C. The magnitude and direction of current depend on the combination of electrode metals. SCE thermograms for the Al undoped/doped EC-AI system exhibit two well resolved transition at 110 and 160°C in opposite directions to each other. The phenomena related to these transitions are explained in terms of creation of field at the interfaces and field produced in the bulk of the material. No negative direction transition was observed for electrode systems like Ag-Ag, Pb-Pb, Sn-Sn and Au-Au except for a shoulder of a peak around 100°C. When dissimilar electrode systems (i.e. Al-undoped/doped EC-Ag/Pb/Sn) are used, the current rises and then saturates beyond around 160°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210350205
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of zinc-containing epoxy resin (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 203-211 
    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: Novel epoxy resins containing zinc acrylate have been synthesized by reacting zinc acrylate with bisphenol-A and an excess of epichlorohydrin. Parameters such as epoxy equivalent weight, hydroxyl content, and hydrolyzable chlorine content have been estimated. These resins, characterized by IR, 1H-NMR, and 13C-NMR, have been evaluated by thermal analysis. Curing was carried out with polyamide at 130°C for 24 h. Cured resins have improved thermal and chemical resistance. The reaction follows first-order kinetics with activation energy 86 and 34 kJ mol-1 in the presence and absence of zinc acrylate. The role of zinc, which increases epoxidation due to formation of complex with bisphenol-A, has been discussed. © 1994 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510201
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  • 7
    Electronic Resource
    Electronic Resource
    Phenacyldimethylsulfonium ylide-mercuric chloride complex initiated radical polymerization of 4-vinyl pyridine (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 548-550 
    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 Polymerisation von 4-Vinylpyridin bei Initiierung durch einen Komplex aus Phenacyldimethylsulfoniumylid und quecksilberchlorid wurde untersucht. Die Polymerisation wird in Gegenwart von Hydrochinon beziehungsweise Benzen verzögert und durch Dimethylformamid beschleunigt. Ein Mechanismus der Radikalbildung wird vorgeschlagen.
    Notes: The polymerization of 4-vinyl pyridine initiated by phenacyldimethylsulfonium ylide complex of mercuric chloride is investigated. The polymerization reaction is retarded in the presence of hydroquinone and benzene, but accelerated by dimethylformamide. A mechanism for the radical formation is suggested.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010421103
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  • 8
    Electronic Resource
    Electronic Resource
    Poly(N-vinyl pyrrolidone) as a template for the radical polymerization of 4-vinyl pyridine (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 281-285 
    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: Der Wechselwirkungskoeffizient zwischen Poly(N-vinylpyrrolidon) und Poly(4-vinylpyridin) wurde in Lösungen von Mischungen dieser Polymere in verschiedenen Lösungsmitteln bestimmt. Die Ergebnisse zeigen die Bildung von Komplexen der beiden Polymere. Maximale Komplexbildung wurde beim molaren Verhältnis 1:1 gefunden. Kinetik und Mechanismus der Polymerisation von 4-Vinylpyridin in Dimethylformamid mit Poly(N-vinylpyrrolidon) als Matrix wurden untersucht.
    Notes: The coefficient of interaction between poly(N-vinyl pyrrolidone) and poly(4-vinyl pyridine) is determined in solutions of the mixture of these two polymers in different solvents. The results show the complexation of the polymers. Maximum complexation occurred at molar ratio 1:1. The kinetics and mechanism of polymerization of 4-vinyl pyridine in dimethylformamide with poly(N-vinyl pyrrolidone) as a template is investigated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420611
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