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  • Polymer and Materials Science  (660)
  • Physics  (183)
  • Organic Chemistry  (81)
  • 1980-1984  (488)
  • 1965-1969  (242)
  • 1940-1944  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the hydrodynamic conductivity and dielectric properties of diluted solutions of poly[bis-(trifluoroethoxyphosphazenes)] in organic solvents (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 109-113 
    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 Untersuchung der viskosimetrischen, konduktometrischen und dielektrischen Eigenschaften verdünnter Lösungen von vier Proben des Poly-[bis-(trifluoroethoxy)phosphazens] zeigte, daß das Polymer einen Polyelektrolytcharakter aufweist. Es wird angenommen, daß dies auf die Anwesenheit anomaler Kettenglieder in den Makromolekülen zurückzuführen ist.
    Notes: By investigating the viscosimetric, conductometric and dielectric properties of four samples of poly[bis-(trifluoroethoxyphosphazenes)] the polymer was found to have polyelectrolyte characteristics which are suggested to be caused by anomalous units within the macromolecular chain.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330202
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  • 2
    Electronic Resource
    Electronic Resource
    A note on the hydrodynamic properties of poly(phenyl-sila-sesqui-oxanes)s containing bifunctional units (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 702-704 
    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 abhängigkeit der Grenzviskositätszahl von der Molekülmasse für Poly(phenyl-sila-sesqui-oxan) mit einem geringen Gehalt der bifunktionellen Gruppen (CH3)2SiO und Ph2SiO wird auf Grundlage der für steifkettige Polymere entwickelten Theorie interpretiert. Angeäherte Werte der statistischen Segmentlänge werden ermittelt und diskutiert.
    Notes: The dependence of intrinsic viscosity on the molar mass of ladder-like poly(phenyl-sila-sesqui-oxane)s containing a small amount of bifunctional units, (CH3)2SiO and Ph2SiO, is interpreted in terms of the theory developed for stiffchain polymers. Approximate values of the Kuhn segment length are estimated and discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331207
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of anomalies of the chemical structure on the polyelectrolyte properties of poly[bis-(trifluoroethoxyphosphazenes)] (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 114-116 
    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 Ursachen des Polyelektrolytcharakters von Polyorganophosphazenen wurden untersucht. Dabei wurde gezeigt, daß die Anwesenheit anomaler Kettenglieder wie in den Makromolekülen des Poly-[bis-(trifluoroethoxy)phosphazens] zur Entstehung ionogener Gruppen in diesem Polymer führt.
    Notes: The cause of polyelectrolyte characteristics of polyorganophosphazenes was investigated. The presence of anomalous units as was found to result in the formation of ionogenic groups.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330203
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese von Polybutylenterephthalat: Dichte der Monomere und Reaktionsgemische (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 282-284 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320511
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  • 5
    Electronic Resource
    Electronic Resource
    Annihilation von Positronen in Polymeren (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 187-190 
    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 angular correlation of positron annihilation radiation from various polymers has been measured. The variance of the narrow component is discussed in terms of para-Ps atoms diffusion and trapping by the microcavities in the polymer. Relationship between the degree of crystallinity and the intensity of the narrow component is obtained and the concentration of crystallites in polyethylene is found to be Nc = 6 · 1018cm-3.
    Notes: Die Winkelkorrelation der Vernichtungsstrahlung wurde in verschiedenen Polymeren untersucht. Die Änderung der schmalen Komponente wird in Verbindung mit der Diffusion und dem Einfang von para-Ps-Atomen in Mikroporen diskutiert. Es wurde eine Beziehung zwischen dem Kristallinitätsgrad und der schmalen Komponente abgeleitet, die es gestattet, die Konzentration der Kristallite in Polyethylen mit Nc = 6 · 1018cm-3 abzuschätzen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310309
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  • 6
    Electronic Resource
    Electronic Resource
    Importance of hydrolysis as a secondary reaction in the synthesis of poly-[bis-(trifluoroethoxy)phosphazenes] (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 331-334 
    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: Die Hydrolyse als Nebenreaktion bei der Substitution der Chloratome gegen Trifluorethoxygruppen im Polydichlorphosphazen wurde untersucht. Diese Nebenreaktion Lauft bei der Synthese von Poly-[bis-(trifluorethoxy)phosphazen] selbst bei Verwendung von geringe Mengen Restwasser (0,005 bis 0,006 Vol.-%) enthaltenden Lösungsitteln ab. Die Effektivität der Hydrolyse als Nebenreaktion hängt von der Wassermenge im Reaktionsmedium und der Dauer des Substitutionsprozesses ab. Es wurde festgestellt, daß in Gegenwart von 2,2,2,-Trifluorethanol die Wahrsheinlichkeit der Polyphosphazenhydrolyse im Reaktionssystem Kleiner wird.
    Notes: The hydrolysis as a secondary reaction in the substitution of chlorine atoms by trifluoroethyl groups in poly(dichlorophosphazene)s has been investigated. This reaction proceeds in the synthesis of poly-[bis-(trifluoroethoxy)phosphazenes] selbst bei Verwendung von geringe Mengen Restwasser (0,005 bis 0,006 Vol.-%) The efficiency of Hydrolysis as a side reaction depends on the amount of water in the reaction medium and the time required for substitution. The probability of the hydrolysis of phosphazenes was found to decrease in the presence of 2,2,2-trifluorethanol.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330509
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  • 7
    Electronic Resource
    Electronic Resource
    A study of the mechanism of radiation-induced polymerization of carbon suboxide (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 1551-1558 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The γ radiolysis of solid C3O2 at 77 K produces paramagnetic centers of several types. The ESR spectrum constitutes a number of narrow lines with an anisotropic g factor. Some of the centers are photounstable and are lost after optical bleaching. Heating the sample results initially in the loss of photounstable centers and then, in the temperature region in which solid C3O2 undergoes a phase transition (140 K), loss of the centers responsible for the center section of the ESR spectrum. In the temperature region 140-270 K concentration of the centers remained at the level of 1015-1016 g-1. At higher temperatures an intense polymerization of liquid C3O2 followed by a sharp increase in concentration of the paramagnetic centers was observed. It is assumed that in radiolysis at 77 K and on subsequent heating the formation of oligomeric centers in solid C3O2 results in a decreasing probability of their loss. Using a calorimetric technique, we studied the kinetics of the postradiation polymerization of C3O2. Small additions of acetone (cationic inhibitor) brought about the loss of the oligomeric centers and suppressed completely all postpolymerization. The polymerization rate increased with the concentration of the resulting polymer. An autocatalytic character of the process is supposed to be connected with the formation of polymer-monomer complexes.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170180512
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal conversions of polymers with macroheterocycles in the chain (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2675-2682 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal conversion of polyhexazocyclanes and compound modeling the fragments of polymers were explored within 300-600°C under vacuum (10-5 torr) and in water vapor. At temperatures below 450°C, the hydrolytic degradation plays a key role in the thermal degradation of polyhexazocyclanes. At a higher temperature, the homolytic processes prevail, water, strongly retained by the macroheterocycle, is most important in the hydrolysis process. It was shown that the increase in the thermohydrolytic stability of polymers with the system of condensed cycles in the macroheterocycles and that of polyhexazocyclanes modified by polymer analogous conversion at the secondary amino groups of the isoindole cycle was caused by the absence of bound water.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210906
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  • 9
    Electronic Resource
    Electronic Resource
    Some electrophysical properties of polyphthalocyanines under the action of high pressure and shear deformation (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 21 (1983), S. 929-937 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of high pressure or the combined action of high pressure and shear deformation on the conductivity G and capacitance C of metal-free polyphthalocyanines (PPhCs), differing in macromolecular size, order, and degree of crosslinking, has been studied. It has been found that both G and C increase with compression. A similar phenomenon is observed under the combined action of high pressure and shear deformation on PPhC, but in this case the critical pressure needed for change in G is lower than that observed in uniaxial compression experiments. Spectroscopic investigations show that the effects of pressure and deformation on the electrophysical properties of samples under load is not connected with changes in the chemical structure of PPhC, but appear to be due to the change in the average distance between the regions of continuous conjugation. The sizes of such regions may be increased by preliminary thermal treatment.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.180210609
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  • 10
    Electronic Resource
    Electronic Resource
    Some relationships of the reaction of poly(dichlorophosphazens) with 2,2,2-sodium trifluoroethylate (R) (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 598-604 
    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: Es wurde der Einfluß verschiedener Faktoren - der Reaktionstemperatur und -dauer, der Konzentration und des Verhältnisses der Ausgangskomponenten, der Lösungsmittel - auf den Grad der Chlorsubstitution im linearen Polydichlorphosphazen durch Trifluorethoxygruppen sowie auch auf die Nebenreaktionen der Hydrolyse während der Substitution untersucht. Es wurde gezeigt, daß man durch die Wahl der Synthesebedingungen die chemische Einheitlichkeit des entstehenden Poly(bis-(trifluorethoxy)phosphazens) regulieren kann.
    Notes: The effect of various quantities, as temperature and time of reaction, initial concentration and ratio of the components and kind of the solvent, on the degree of substitution of chlorine in linear poly(dichlorophosphazene) by trifluoroethoxy groups as well as on the side reaction of hydrolysis during substitution has been investigated. The chemical homogeneity of the poly(bis-(trifluoroethoxy)phosphazene) obtained can be controlled by choosing appropriate conditions of reaction.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331007
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