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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1145-1155 
    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: Compositional analysis of 2,6-dimethyl-1,4-phenylene oxide (PPO) and styrene homopolymer blends was accomplished using infrared spectrometry and pyrolysis gas chromatography. In infrared measurements the 1030/700 cm-1 absorption ratio provides percent PPO in the blends within ±3% of the actual value but with a σ% of ±10. In pyrolysis GC measurements, four peaks resulting from the fragmentation of the PPO molecule have been investigated for quantitation. One of these peaks provides results with ±2% of the PPO present with a σ% of 7 when the percent PPO in the blend is above 20.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 2
    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: Es wird über Eichresultate mit Linearen Styragelkolonnen (Waters Associates) in Chloroform, N,N′-Dimethylformamid und Tetrahydrofuran unter Anwendung von Polystyrol-Standard-Substanzen berichtet. Eine Lineare Beziehung zwischen den Molekulargewichten und den Retentionsvolumina wurde im Molekulargewichtsbereich 4000-1000000 beobachtet. Die Daten in Chloroform sind über einen Zeitraum von zwei Jahren reproduzierbar. Die % σ-Werte variieren zwischen 0,56 und 1,30, was beweist, daß die Unbeständigkeit der Kolonneneichung bei gelchromatographischen Messungen nur einen kleinen Fehler verursacht.
    Notes: Results of calibration with linear styragel columns (Waters Associates) are presented in chloroform, N,N′-dimethylformamide and tetrahydrofuran using standard polystyrenes. A linear relationship between molecular weight and retention volume is observed in the 4,000 to ∼ 1,000,000 molecular weight range. Reproducibility data for calibration in chloroform, over a period of two years, are presented. The % σ varies between 0.56-1.30 showing that the column calibration instability contributes only a small error to the gel permeation chromatographic measurements.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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