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  • Polymer and Materials Science  (33)
  • General Chemistry  (30)
  • Numerical Analysis  (13)
  • Space Sciences (General)  (8)
  • 1
    Electronic Resource
    Electronic Resource
    The synthesis and solution properties of some rigid-chain, water-soluble polymers: Poly[N,N′-(sulfo-phenylene)phthalamide]s and poly[N,N′-(sulfo-p-phenylene)pyromellitimide] (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3745-3757 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly[N,N′-(sulfo-phenylene)phthalamid]es and poly[N,N′-(sulfo-p-phenylene)pyromellitimide] were prepared in water-soluble form and were found to have unique solution properties, similar in some respects to xanthan. The polymer most investigated, poly[N,N′-(sulfo-p-phenylene)terephthalamide] (PPT-S), is produced as the dimethylacetamide (DMAC) salt by the solution polymerization of 2,5-diaminobenzenesulfonic acid with terephthaloyl chloride in DMAC containing LiCl. The isolated polymer requires heating in water to dissolve; the resulting cooled solutions are viscous or gels at concentrations as low as 0.4%. They are highly birefringent, exhibit circular dichroism properties, and are viscosity-sensitive to salt. Solutions of this polymer mixed with those of guar or hydroxyethyl cellulose give significantly enhanced viscosity. The polymer is relatively low molecular weight, ca. 5000 estimated from viscosity data. Some meta and para isomeric analogs of PPT-S were prepared; these polymers have similar properties except they are more soluble in water, and higher concentrations are required to obtain significant viscosity. Poly[N,N′-(sulfo-p-phenylene) pyromellitimide] (PIM-S) was prepared similarly from 2,5-diaminobenzenesulfonic acid and pyromellitic dianhydride. Its aqueous solution properties are similar to those of PPT-S. It appears that these relatively low-molecular-weight rigid-chain polymers associate in water to form a network that results in viscous solutions at low concentrations.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271115
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  • 2
    Electronic Resource
    Electronic Resource
    Der Einfluß der Feuchteaufnahme auf die mechanischen Eigenschaften von PhenoplastenMitteilung aus dem Institut für Werkstoffkunde der TH Darmstadt. (1984)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 15 (1984), S. 299-308 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Effect of Moisture on the Mechanical Properties of Phenolic Moulded MaterialsIn order to use thermosetting moulding material it is necessary to know how the mechanical properties are changed by absorption of water. Therefore, multiphase systems based on phenolic resin, with varying quantities of wood flour and/or powdered minerals as fillers, were examined. The relationship between moisture absorption and the change in Young's modulus, flexural strength and the strain of the outer fibre at fracture was determined. It could be shown that the increase in flexural strength as water absorption began is a result only of the swelling stress.
    Notes: Voraussetzung für den Einsatz duroplastischer Formstoffe in erhöhter Umgebungsfeuchte ist die Kenntnis der durch die Feuchteaufnahme bewirkten Änderung der mechanischen Werkstoffeigenschaften. Ausgehend von in ihrer Zusammensetzung variierten Mehrstoffsystemen auf der Basis Phenolharz/Holzmehl/Gesteinsmehl wird die formstoff- und feuchtespezifische Wechselwirkung zwischen Feuchteaufnahme, Biege-E-Modul, Biegefestigkeit und Randfaserdehnung beim Bruch aufgezeigt, und nachgewiesen, daß der zu Lagerungsbeginn zu beobachtende Anstieg der Biegefestigkeit ausschließlich auf durch Sorption hervorgerufene Druck-Eigenspannungen zurückzuführen ist.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19840150902
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  • 3
    Electronic Resource
    Electronic Resource
    Zum Quellverhalten duroplastischer FormstoffeMitteilung aus dem Institut für Werkstoffkunde der TH Darmstadt. (1984)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 15 (1984), S. 349-359 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Swelling Behaviour of Thermosetting MaterialsThe moisture absorption of moulded materials can endanger a construction because of the change in volume of various parts. Therefore it is necessary to know the maximum possible swelling of the moulded materials employed at different relative humidities. The swelling of modified phenolic resin systems are described. Wood flour (which absorbs moisture) and powdered minerals (which in this case can be considered as inert) were used as fillers.Different methods have been developed to calculate the maximum possible swelling after a relatively short testing time (ca. 1000 h).
    Notes: Die Feuchteaufnahme eines Formstoffes kann durch die damit verbundene Volumenänderung des Formteils die Funktion einer Baugruppe gefährden. Daher muß die maximal mögliche formstoff- und umgebungsfeuchtespezifische Quelldehnung der eingesetzten Formstoffe bekannt sein. Am Beispiel von Ein-, Zwei- und Dreistoffsystemen mit Phenolharz als Matrixwekstoff wird der Einfluß der Harzträger Holzmehl (im Hinblick auf die Feuchteaufnahme „aktiv“) und Gesteinsmehl („inaktiv“) auf die Quellung untersucht. In diesem Zusammenhang werden Methoden aufgezeigt, die eine Abschätzung der maximal möglichen Quelldehnung nach relativ kurzer Versuchsdauer (etwa 1000 h) ermöglichen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19840151005
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  • 4
    Electronic Resource
    Electronic Resource
    Das Verhalten von PVC hart gegen Chemikalieneinwirkung (1986)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 17 (1986), S. 66-74 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Behaviour of Unplasticized PVC under Chemical AttackAfter a general view on the mechanism of chemical attacks to plastic materials, the most important effects to the chemical resistance of unplasticized PVC will be described.The test methods for the determination of chemical resistance are explained, basing on the historical development over 50 years time and the evidence of information.With the aid of some characteristic examples the various mechanism of attack and their influence on uplasticized PVC are described both for immersiontest as well as for long term internal pressure tests and it is shown, that both tests complete each other.A proposal is made for the determination of chemical resistance factors fCR of unplasticized PVC basing on long term internal pressure tests with acceptable testing times.In consideration of the results of immersion tests it will be possible to give fCR factors for rigid PVC too, without being forced to wait for the abrupt drop of the characteristic creep strength curve, which is not yet reached after 105 hours, with water at 60 degr. C.
    Notes: Nach einem Überblick über die Angriffsvorgänge bei der Einwirkung von Chemikalien auf Kunststoffe, werden die wichtigsten Einflußgrößen auf die Widerstandsfähigkeit von weichmacherfreiem PVC hart beschrieben. Die Prüfmethoden zur Bestimmung der Widerstandsfähigkeit von PVC hart werden aus ihrer 50jährigen historischen Entwicklung erläutert und ihre Aussagefähigkeit bewertet. An einigen charakteristischen Beispielen werden die verschiedenen Angriffsvorgänge und ihre Wirkung auf PVC hart sowohl beim Immersions- als auch beim Zeitstand-Innendruckversuch beschrieben und gezeigt, daß sich beide Versuche ergänzen können.Es wird ein Vorschlag zur Ermittlung chemischer Resistenzfaktoren fCR für PVC hart aus Zeitstand-Innendruckversuchen mit vertretbaren Versuchszeiten gemacht. Durch die Berücksichtigung der Ergebnisse aus Immersionsversuchen ist es möglich, auch fCR-Faktoren für PVC hart anzugeben, ohne einen Steilabfall der Zeitstandkennlinie abwarten zu müssen, der bei PVC hart-Rohren mit Wasser bei 60°C auch nach 105h noch nicht erreicht ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19860170208
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  • 5
    Electronic Resource
    Electronic Resource
    Das Verhalten von PVC hart gegen Chemikalieneinwirkung (1986)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 17 (1986), S. 98-108 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19860170307
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  • 6
    Electronic Resource
    Electronic Resource
    E-Modul und Kriechverhalten von Phenoplasten bei Raumtemperatur. Einfluß der Formstoffzusammensetzung (1980)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 11 (1980), S. 92-100 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Relationship Between Composition, Elastic Modulus and Creep of Phenolic Plastics at Room TemperatureThe mechanical properties of thermosetting material can be modified by the type and quantity of filler or the combination of fillers. By this methode it is possible to produce a certain moulding powder for a certain application. The elastic modulus and the creep are significant values for short-time and long-time mechanical behaviour. The relationship between these both characteristic values and the compositions of moulded materials (multiphase phenolic resin systems) will be discussed.
    Notes: Die mechanischen Eigenschaften duroplastischer Teilchenverbundwerkstoffe können unter anderem durch die Wahl des Harzträgers beeinflußt und somit dem jeweiligen Anwendungsfall angepaßt werden. Für das mechanische Kurz- bzw. Langzeitverhalten sind der E-Modul und die Kriechdehnung als signifikant anzusehen, daher wird am Beispiel dieser beiden Werkstoffdaten der Zusammenhang von Formstoffzusammensetzung und mechanischen Eigenschaften aufgezeigt. Die untersuchten Phenoplast-Formstoffe bestehen aus den Hauptkomponenten Harz/Holzmehl/Gesteinsmehl.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19800110306
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  • 7
    Electronic Resource
    Electronic Resource
    Fourth international symposium on polymer analysis and characterization (ISPAC) (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2376-2377 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420831
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  • 8
    Electronic Resource
    Electronic Resource
    Fourth international symposium on polymer analysis and characterization (ISPAC) (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2628-2629 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420928
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  • 9
    Electronic Resource
    Electronic Resource
    Fourth international symposium on polymer analysis and characterization (ISPAC) (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2854-2855 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070421026
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  • 10
    Electronic Resource
    Electronic Resource
    Fifth international symposium on polymer analysis and characterization (ISPAC) (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 1397-1397 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070430725
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