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1

Digitale Medien

Aromatic polyamides. II. Thermal degradation of some aromatic polyamides and their model diamides (1981)

Khanna, Y. P. ; Pearce, E. M. ; Smith, J. S. ; [weitere]

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 2817-2834

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ISSN: 0360-6376

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Thermal degradation behavior of poly(1,3-phenylene isophthalamide) and poly(chloro-2,4-phenylene isophthalamide) was investigated with the aid of some appropriate model compounds. The pyrolysis products of these materials were identified by gas chromatography (GC), gas chromatography/Fourier transform infrared spectroscopy (GC/FT-IR), and gas chromatography/mass spectrometry (GC/MS). The residual chars were characterized by IR spectroscopy. Thermogravimetric analysis (TGA) was applied to study the effect of end-group concentration on the degradation characteristics of the two polyamides. Kinetic parameters that describe the thermal degradation of the polyamides were also evaluated by TGA. The results of this investigation suggest that the thermal decomposition of these aromatic polyamides involves homolytic as well as hydrolytic cleavages of the amide units.

Zusätzliches Material: 13 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1981.170191115

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2

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Spectroscopic studies of solutions, suspensions, and precipitates of poly(1,6-di-p-toluene sulfonyloxy-2,4-hexadiyne) (1981)

Bloor, D. ; Batchelder, D. N. ; Ando, D. J. ; [weitere]

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Physics Edition 19 (1981), S. 321-334

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ISSN: 0098-1273

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Optical-absorption, fluorescence, and Raman spectra for solutions, suspensions, and precipitates of poly(1,6-di-p-toluene sulfonoxy-2,4-hexadiyne) in and from nitrobenzene, acetone, and chloroform are presented. These are interpreted in terms of the occurrence of two forms of the polymer chain; a quasicrystalline form with properties close to those of single crystal polymer and a chain-extended form occurring in solution and colloidal particles, with an absorption energy of about 2.5 eV (20,000 cm-1). No evidence is found for the presence of very short polymer chains in partially polymerized monomer at low conversion. The relationship of these results to those for deformed single crystals is briefly discussed.

Zusätzliches Material: 9 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1981.180190212

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Zwickl, R. D. ; Belian, R. D. ; Baker, D. N. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: It is pointed out that the redeployment of ISEE 3 from its continuous monitoring of the solar wind in a large orbit about the upstream Lagrangian point to an extended magnetotail orbit has afforded an opportunity for deep-tail passage of October 1982, and in the radial range from 200 to 220 R(E) during the near-apogee part of the second tail passage in January-February 1983. Attention is given to instrumentation and data sets, spacecraft positions, and observational data.

Schlagwort(e): GEOPHYSICS

Materialart: Journal of Geophysical Research (ISSN 0148-0227); 89; 3855-386

Format: text

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4

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Winningham, J. D. ; Burch, J. L. ; Gurnett, D. A. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-08-13

Beschreibung: Dynamics Explorer 1 measurements of intense low-frequency electric and magnetic noise observed at low altitudes over the auroral zone are described. The intensity of both the electric and magnetic fields decreases rapidly with increasing frequency. Most of the energy is at frequencies below the O(+) cyclotron frequency, and some evidence is found for a cutoff or change in spectral slope near that frequency. The magnetic to electric field ratio decreases rapidly with increasing radial distance and also decreases with increasing frequency. The polarization of the electric field in a plane perpendicular to the earth's magnetic field is essentially random. The transverse electric and magnetic fields are closely correlated, with the average Poynting flux directed toward the earth. The total electromagnetic power flow associated with the noise is substantial. Two general models are discussed to interpret these observations, one based on static electric and magnetic fields imbedded in the ionosphere and the other based on Alfven waves propagating along the auroral field lines.

Schlagwort(e): GEOPHYSICS

Materialart: AD-A150627 , Journal of Geophysical Research (ISSN 0148-0227); 89; 8971-898

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5

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Structure of the magnetotail at 220 earth radii and its response to geomagnetic activity (1984)

Mccomas, D. J. ; Hones, E. W., Jr. ; Zwickl, R. D. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-18

Beschreibung: Using plasma electron and magnetic field measurements from ISEE 3, 220 earth radii from earth, it is found that the magnetotail at that distance is a coherent structure that evidently waves about through distances comparable to its own lateral scale size. For about one-third of the time it was inside the magnetotail, ISEE 3 was in the plasma sheet. During quiet times the plasma sheet is apparently quite thin, but in response to geomagnetic activity it expands, becoming filled with hot plasma flowing tailward at speeds sometimes exceeding 1000 km/sec, and forces the magnetotail cross-section itself to expand. The plasma sheet's expansion is delayed typically by about 30 minutes from the onset of the associated geomagnetic activity (often a clearly identified isolated substorm). The magnetic field in the newly-expanded plasma sheet usually exhibits a few-minute steep northward excursion followed by a more prolonged (and often steep) southward excursion. These are believed to be the signatures of arrival of a plasmoid formed and released near the earth at the onset of the corresponding geomagnetic activity. The discreteness of these plasma releases through the magnetotail and their close association with onsets of geomagnetic activity at earth suggest that they are consequences of spontaneous release, probably by magnetic reconnection, of energy and plasma earlier stored in the magnetotail.

Schlagwort(e): GEOPHYSICS

Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 5-7

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Plasma entry into the distant tail lobes - ISEE-3 (1984)

Zwickl, R. D. ; Bame, S. J. ; Tsurutani, B. T. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-19

Beschreibung: ISEE-3 measurements indicate that a broad mantle-like boundary layer plasma often exists within the distant geomagnetic tail lobes at all latitudes, directly adjacent to the tail magnetopause. The presence of this boundary layer at large tail distances indicates that plasma from the magnetosheath often crosses the magnetopause locally along much of the length of the tail, and is evidence that the tail is 'open'.

Schlagwort(e): GEOPHYSICS

Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 1078-108

Format: text

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7

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Spiral feature observed at top of rotating thunderstorm (1981)

Adler, R. F. ; Moore, D. A. ; Fenn, D. D.

In: Other Sources

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Publikationsdatum: 2011-08-18

Beschreibung: A dark spiral feature is noted in the geosynchronous satellite visible image of the top of a thunderstorm which also has a Doppler radar-observed mesocyclone. Although the evidence is not conclusive, the feature may represent cyclonic rotation at cloud top associated with the pre-tornado mesocyclone.

Schlagwort(e): METEOROLOGY AND CLIMATOLOGY

Materialart: Monthly Weather Review; 109; May 1981

Format: text

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8

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Simultaneous stratospheric measurements of H2O, HDO, and CH4 from balloon-borne and aircraft infrared solar absorption spectra and tunable diode laser laboratory spectra of HDO (1984)

Fridovich, B. ; Seals, R. K., Jr. ; Goldman, A. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-18

Schlagwort(e): GEOPHYSICS

Materialart: Journal of Geophysical Research (ISSN 0148-0227); 89; 7259-726

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9

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Evidence for slow-mode shocks in the deep geomagnetic tail (1984)

Mccomas, D. J. ; Slavin, J. A. ; Gosling, J. T. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-18

Beschreibung: Plasma and field data from the ISEE-3 space probe provide evidence that the lobe-plasma sheet boundary is the central part of the distant geomagnetic tail is often a slow-mode shock. Such shocks are predicted by Petchek's (1964) model of the reconnection. If this model applies, then the ISEE-3 observations place the general location of the reconnection diffusion region closer to the earth than x of about -100 earth radii.

Schlagwort(e): GEOPHYSICS

Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 599-602

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10

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Detailed examination of a plasmoid in the distant magnetotail with ISEE 3 (1984)

Zwickl, R. D. ; Birn, J. ; Feldman, W. C. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: Details of an investigation of a lone plasmoid encountered by the ISEE-3 spacecraft in February 1983 are reported. ISEE-3 was then at 217 earth radii distance, in the magnetosheath, and had entered the magnetotail. Intense energetic particle, plasma and magnetic field fluctuations were detected, indicating a large electron flux moving tailward, a suprathermal proton flux, a jump in electron temperature, and inverse signatures of an increasing magnetic field. Closed magnetic field lines were also detected as were IMF field lines around the plasmoid and open field lines connecting the earth with space. The hot particles in the plasmoid are concluded to have been magnetically confined in a boundary one earth radius thick. An earthward directed beam was also detected and was found to balance the tailward flux. The origin and characteristics of the beam were not discerned.

Schlagwort(e): GEOPHYSICS

Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 1046-104

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