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  • Wiley-Blackwell  (7)
  • Springer  (2)
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  • Wiley-Blackwell  (7)
  • Springer  (2)
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  • 1
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    Electrochemical behaviour of N-methylene bridges in amino resin oligocondensation products (1984)
    Springer
    Details
    Publication Date: 1984-01-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical behaviour of N-methylene bridges in amino resin oligocondensation products (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 252-254 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary N-methylene bridges in amino resin oligocondensation products can be determined with sufficient reliability by a selective polarographic method. By investigating the mechanism of the electrochemical reaction the methylene bridges were found to cause a catalytic hydrogen wave which, due to its proportionality to the concentration, provides the basis for the analytical determination. The results obtained with aniline, urea, hexahydrotriazine and acrylamide support this mechanism and suggest further possibilities of application of this method.
    Notes: Zusammenfassung N-Methylenbrücken in Aminoharzoligokondensaten lassen sich mittels einer selektiven polarographischen Methode mit guter Genauigkeit bestimmen. Aus den Untersuchungen zum elektrochemischen Reaktionsmechanismus geht hervor, daß N-Methylenbrückenstrukturen eine katalytische Wasserstoffwelle verursachen, die auf Grund ihrer guten Konzentrationsproportionalität zu analytischen Bestimmungen herangezogen werden kann. Untersuchungen an Anilin-, Harnstoff-, Hexahydrotriazin- und Acrylamidverbindungen bestätigen den Mechanismus und weisen auf die Möglichkeit einer breiteren Nutzung der Methode hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487267
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  • 3
    Electronic Resource
    Electronic Resource
    Über eine selektive Methode zur Bestimmung von Methylenbrücken in Aminoharzen (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 522-524 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300812
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  • 4
    Electronic Resource
    Electronic Resource
    Amino resin microcapsules. II. Preparation and morphologyDedicated to Professor Dr. Dr. h. c. Hermann Klare on occasion of his 80th birthdayPart I: see [8] (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 325-331 
    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: Aminoharz-Mikrokapseln wurden aus partiell veretherten Melamin-Formaldehyd-Harzen ohne weitere Zusatzstoffe hergestellt. Als Modellsubstanz für das Kernmaterial wurde Methylparathion verwendet. Die Einflüsse verschiedener Parameter auf den Verkapselungsprozeß, die Kapselmorphologie und einige Kapseleigenschaften wurden untersucht. Mit der beschriebenen Methode lassen sich Kapseln mit mittleren Durchmessern zwischen 5 und 50 μm und Wanddicken zwischen 30 und 300 nm herstellen. Erste Vorstellungen zum Mechanismus der Kapselbildung werden diskutiert.
    Notes: Amino resin microcapsules are prepared from partial etherified melamine-formaldehyde resins without other additives. As model substance for the core material mainly methylparathion was used. The influences of different parameters on the encapsulation process, the capsule morphology and some capsule properties were investigated. It is shown that by this method capsules with average diameters between 5 and 50 μm and a wall thickness between 30 and 300 nm can be obtained. The encapsulation of liquids as well as solids is possible. First ideas to the mechanisms of the capsule formation are discussed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400507
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  • 5
    Electronic Resource
    Electronic Resource
    Amino resin microcapsules. III. Release properties (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 683-690 
    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 Freisetzung von mikroverkapselten Wirkstoffen aus Aminoharz-Mikrokapseln in Wasser und Luft wurde am Beispiel von Methylparathion (0,0-Dimethyl-0-p-nitrophenyl-thiophosphorsäureester) untersucht. Die Freisetzungseigenschaften sind stark von den Herstellungsbedingungen der Kapseln abhängig und durch Salzzusätze während der Herstellung sowie durch eine Lagerung bei Raumtemperatur zu verändern. Die Freisetzung des Wirkstoffs in Luft zeigt ähnliche Abhängigkeiten wie die in Wasser. Bei künstlicher Belichtung (Xenotest) tritt nach 30 h ein Wirkstoffverlust von 20 bis 40% auf.
    Notes: The release of microencapsulated active agents from amino resin microcapsules into water and air has been investigated with the example of methylparathion (0,0-dimethyl-0-p-nitrophenyl-thiophosphoric-ester). The release of the active agent has been proved to be strongly dependent on the conditions of capsule preparation. The release properties can also be influenced in a wide range by addition of salts during capsule preparation or by storage at room temperature. The release in air shows similar results as in water. Under artificial light (Xenotest) after 30 h exposure a loss of active agent between 20 and 40% has been found.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010401101
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  • 6
    Electronic Resource
    Electronic Resource
    Infrarotspektroskopische Untersuchungen an Harnstoff-Formaldehyd-Feststoffen (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 574-579 
    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: Urea formaldehyde particles formed by acid-catalyzed condensation were investigated by infrared spectroscopy. Depending on the composition three different structures were found. At molar ratio F/H 〈 1.25 linear crystalline methylene ureas were obtained, at F/H 〉 1.25 dimethylene ether linkages, and only when the reaction is carried out under strong acid conditions cyclic structures (urons) are formed.
    Notes: Durch säurektalysierte Polykondensation hergestellte feinverteilte Harnstoff-Formaldehyd-Feststoffe wurden infrarotspektroskopisch untersucht. In Abhängigkeit von der Zusammensetzung wurden drei verschiedene Strukturen gefunden. Bei einem Molverhältnis F/H 〈 1,25 wurden lineare kristalline Methylenharnstoffe erhalten, bei F/H 〉 1,25 Dimethylenetherstrukturen und nur unter stark sauren Bedingungen cyclische Strukturen (Urone).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010381007
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  • 7
    Electronic Resource
    Electronic Resource
    Amino resin microcapsules. IV. Surface tension of the resins and mechanism of capsule formationPart III: see [4]Dedicated to Professor Dr. habil. Burkart Philipp on occasion of his 65th birthday (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 91-95 
    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 grenzflächenaktivitä wäßriger Lösungen von Melamin-Formaldehyd-Harzen wurde in verschiedenen Stufen der Harzynthese untersucht. Zur Bildung von Mikrokapseln geeignete, partiell methanolveretherte Melamin-Form-aldehyd-Harze sind reaktionsfähige grenzflächenaktive Verbindungen. Die Bildung der Kapselwände aus diesen Verbindungen ist eine Einkomponenten-Grenzflächenpolykondensation.
    Notes: The surface activity of aqueous solutions of melamine formaldehyde resins was investigated at different stages of the resin synthesis. Partially methanol etherigied melamine formaldehyde resins, which are able to form microcapsules, are reactive surface active compounds. The formation of capsuole walls with these resins proved to be a one-component interfacial polycondensation reaction.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410205
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  • 8
    Electronic Resource
    Electronic Resource
    Amino resin microcapsules. I. Literature and patent review (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 243-251 
    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: Aminoharze können als Wandmaterial bei der Mikroverkapselung von Pharmaka, Agrochemikalien, Klebstoffen und Farbstoffsystemen für Reaktionsdurchschreibepapiere verwendet werden. Die Mikroverkapselung erfolgt mit unmodifizierten oder modifizierten, veretherten oder unveretherten Aminoharzen, meist unter Zusatz wasserlöslic her polymerer Verbindungen als Schutzkolloid.
    Notes: Amino resins can be applied as well materials for the microencapsulation of drugs, agrochemicals, adhesives, and dyestuff systems for pressure-sensitive copying paper. The microencapsulation is carried out with unmodified or modified, etherified or non-etherified amino resins, in most cases with addition of water-soluble polymers as protective colloids.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400406
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Analytik der Anfangsphase der Reaktion von Melamin und Harnstoff mit Formaldehyd (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 329-334 
    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: The usefulness of polarographic methods for investigating the initial stage of the reaction of melamine and urea with formaldehyde is discussed. Analytical methods for the determination of the overall formaldehyde content, free formaldehyde, methylol formaldehyde and oxidable formaldehyde are described.
    Notes: In der vorliegenden Arbeit werden vorzugsweise polarographische Methoden zur Untersuchung der Anfangsphase der Reaktion von Melamin und Harnstoff mit Formaldehyd diskutiert und Analysenmethoden für die Bestimmung des Gesamtoformaldehyds, des freien Formaldehyds, des Methylolformaldehyds und des oxidierbaren Formaldehyds beschrieben.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310509
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