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  • 1
    Electronic Resource
    Electronic Resource
    Phase transfer catalysis in the polycondensation processes (1992)
    Springer
    Polymer bulletin 28 (1992), S. 639-644 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyesters from 3,3′-bis(chloromethyl)oxacyclobutane and dipotassium isophthalate were obtained by phase transfer catalysis using different catalysts and solvents. The products were characterised by IR,1H-NMR and DSC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295966
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of a magnetic field on radicalic polymerization of butyl methacrylate (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 753-758 
    Details
    ISSN: 1435-1536
    Keywords: Butyl methacrylatepolymerization ; magneticfield ; radicalicpolymerization ; synthesizedhomopolymers
    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 Butyl methacrylate polymerization, through various procedures, i.e., bulk, solution and emulsion studies in the presence and absence of a magnetic field was studied. The influence of the magnetic field was observed on the development of the reactions, and also on some properties of the synthesized homopolymers. The behavior of the reaction's occurrence, with and without the magnetic field was compared. The homopolymers obtained were characterized from the viewpoint of their stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776146
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  • 3
    Electronic Resource
    Electronic Resource
    Chemical synthesis of some Schiff base-type polymers containing pyrrole units (1994)
    Springer
    Polymer bulletin 32 (1994), S. 257-264 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The synthesis of three Schiff-base type monomers containing pyrrole units was performed. Their polymerization was carried out by chemical oxidation with (NH4)2S2O8. Some preliminary thermal and electrical properties were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308535
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  • 4
    Electronic Resource
    Electronic Resource
    Electroinitiated polymerization of some new monomers with schiff's base structure and pyrrole moieties (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 221 (1994), S. 103-115 
    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: Monomere mit Pyrrol-Einheiten und dem Strukturelement der Schiffschen Basen wurden durch elektrochemische Oxidation bei gleichzeitiger Fällungspolymerisation in 1,2-Dichlorethan oder Acetonitril hergestellt. Als Monomere wurden Pyrrol-2-aldehydazin, N,N'-bis(2-pyrrolylmethylen)-1,4-diaminobenzol bzw. N,N'-bis(2-pyrrolylmethylen)-4,4′-diaminobiphenyl und als Elektrolyte Tetrabutylammoniumperchlorat, Tetrabutylammoniumtetrafluoroborat sowie Natrium-p-toluolsulfonat eingesetzt. Die dotierten Polymeren wurden mittels Elementaranalyse, IR-Spektroskopie und Thermoanalyse charakterisiert.
    Notes: Pyrrole-2-aldehyd azine, N,N'-bis(2-pyrrolylmethylene)-1,4-diaminobenzene and N,N'-bis(2-pyrrolylmethylene)-4,4′-diaminobiphenyl were polymerized by electro-chemical precipitating oxidation reaction in 1,2-dichloroethane and acetonitrile, respectively, in the presence of electrolytes like tetrabutylammonium perchlorate, tetrabutylammonium tetrafluoroborate and sodium p-toluene sulfonate. The doped resulted polymers were characterized by elemental analysis, IR spectroscopy and thermal analysis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052210109
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of some N-vinyl carbazole containing copolymers (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 298-300 
    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 Copolymerisation von N-Vinylcarbazol mit Methylmethacrylat sowie mit Styren wurde untersucht. Mittels Elementaranalyse und 1H-NMR-Spektroskopie wurde die Zusammensetzung der Copolymere bestimmt. Die Ergebnisse bestätigen, daß die radikalische Lösungscopolymerisation nach dem einfachen Terminalmodell der Copolymerisation abläuft.
    Notes: The copolymerization of N-vinyl carbazole with methyl methacrylate and styrene, respectively, was studied. 1H-NMR spectra and elemental analysis were used to establish the composition of the copolymers. The composition data confirmed that solution radical copolymerization follows quite well the simple terminal copolymerization model.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420702
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  • 6
    Electronic Resource
    Electronic Resource
    Polymerization of styrene with N,N′-bis[(4-t-butylazo-4-cyano-valeryl)-oxyethyl]-azo-bis-formamide (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 665-668 
    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 des Styrens in Lösung mit N,N′-Bis[(4-t-butylazo-4-cyanovaleryl)-oxyethyl]-azo-bis-formamid als bifunktionellem Initiator wurde untersucht. Es wurde gezeigt, daß die Reakion von einigen Faktoren, wie Konzentrationen des Initiators und des Monomers, Temperatur und Zeit, beeinflußt wird. Um die Polymerausbeute und die Molekülmasse mit diesen Parametern zu korrelieren, wurden zwei Regressionsgleichungen aufgestellt, ausgehend von Versuchen nach einem experimentellen, zentrierten, rotierbaren Programm zweiter Ordnung.
    Notes: The solution polymerization of styrene in benzene by using N,N′-bis[(4-t-butylazo-4-cyanovaleryl]-oxyethyl)-azo-bis-formamide as a bifunctional initiator is studied. The reaction was proved to be influenced by some factors, namely, initiator and monomer concentrations, temperature, and duration. To correlate the polymer conversion and its molecular weight with these parameters, two regression equations were obtained by carrying out the experiments according to a centrated, rotatable, second order experimental design.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010421212
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of new poly(phenylquinoxaline-ester-imide)s (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 125-128 
    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: Neue Poly(phenylchinoxalinesterimid)e wurden synthetisiert durch Lösungspolykondensation von vorgebildete Estergruppen enthaltenden Anhydriden mit aromatischen Diaminen, die phenylsubstituierte Chinoxalin-Einheiten enthielten. Die thermische Stabilität und die dielektrischen Eigenschaften dieser Verbindungen werden diskutiert und mit denen ähnlicher heterocyclischer Polymere verglichen.
    Notes: New poly(phenylquinoxaline-ester-imide)s have been synthesized by solution polycondensation of certain dianhydrides containing performed ester groups with aromatic diamines incorporating phenyl-substituted quinoxaline units. The thermal stability as well as the dielectric properties of these compounds are discussed and compared with those of related heterocyclic polymers.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420220
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  • 8
    Electronic Resource
    Electronic Resource
    Solution properties of ultrahigh molecular weight polymers. 17. Conformational transitions of poly(isobutyl methacrylate) in dilute solutionPart 16.: see [2] (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 230-232 
    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 Temperaturabhängigkeit der Viskosität von Poly(isobutylmethacrylat)-Fraktionen mit ultrahoher Molekülmasse in verdünnter Lösung wurde untersucht. Im Temperaturbereich 20 bis 30°C wurde eine Diskontinuität der Grenzviskosität gefunden. Die Untersuchung der ungestörten Dimensionen und der Polymer-Lösungsmittel-Wechselwirkungs-parameter zeigte, daß sowohl die inter- als auch die intramolekularen Wechselwirkungen beeinflußt werden. Der Effekt verändert die Flexibilität der Molekülkette und andere Lösungseigenschaften.
    Notes: The temperature dependence of viscosity of ultrahigh molecular weight poly(isobutyl methacrylate) fractions in dilute solution has been investigated. A discontinuity of intrinsic viscosity was observed in the temperature range 20 to 30°C. The study of unperturbed dimensions and polymer-solvent interaction parameters shows that both inter- and intramolecular interactions are affected. This effect modifies the flexibility of the macromolecular chain and other properties in solution.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420511
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  • 9
    Electronic Resource
    Electronic Resource
    Rheological behaviour of concentrated solutions of acrylic copolymers in ethylene carbonate (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 164-169 
    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: Losungen von Acrylnitril/Vinylacetat/α-Methylstyren-Copolymercnin Ethylencarbonat weiscn ein pseudoplastischcs Verhalten auf, das durch die Abnahme der Viskosität mit steigender Schergeschwindigkcit gekennzeichnet ist. Der newtonsche Bereich der Fließkurven korrespondiert rnit dem Ostwald-de Waele-Modell, und die Ausdehnung iliescs Bereiches hiingt von der Art des Polymers ab. Für Polymere mit hohem Endgruppcngchalt und nicdriger Poly-dispersität ist der newtonsche Bereich weiter ausgcdchnt. Die GroDe dcs Schermoduls G nimmt mit steigendem End- gruppengehalt ab. In gleicher Weise ändern sich die Relaxationszeiten, was zu ciner Abnahme der Lösungselastizität fiihrt und Möglichkeiten zur Erhöhung der Spinngeschwindigkeit bietet. Die scheinbare Aktivierungsenergie des vis- kosen Fließens ist bei den Copolymeren mit geringerer Polydispcrsität niedriger.
    Notes: Solutions of acrylonitrilc/vinyl acetate/α-methyl styrene copolymers in ctliyletie carbotiii to cvitlencc pseudoplastic behaviour, characterized by viscosity decrease as a function of shear ratc. The newtonian range of the flow curves corresponds with the Ostwald-de Waelc model, nncl tlic cxtcnt of this domain tleprntls 0 1 1 thc typc of polymer. For polymers with high contcnt of endgroups and lower polydispcrsity the newtoninn tlomein is more extended. The valurs of shear modulus G decrease with higher contcnt of endgroups in tlic polymer. Relaxation times change in the same direction, which leads to increase of solution elasticity and results in possibilities of incroasing spinning vclocities. Thr apparent activation energy of viscous flow is lower for less polydisperscd copolymers.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420408
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