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Suspension polymerization of vinyl chloride. I. Influence of viscosity of suspension medium on resin properties (1989)

Cebollada, A. F. ; Schmidt, M. J. ; Farber, J. N. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 37 (1989), S. 145-166

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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: The suspension polymerization of vinyl chloride is studied in a bench-scale reactor adequately reproducing reaction conditions and resin properties of industrial relevance. The evolution of particle morphology is analyzed at different stages of conversion, and a model for particle formation is verified. The influence of viscosity of the suspension medium is analyzed in relation to molecular weight distribution and particle morphology.

Additional Material: 21 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/app.1989.070370111

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Zum Umsatz des Monomers Hexamethyldisiloxan in siliciumorganisches Schichtmaterial bei der Glimmpolymerisation (1984)

Schulz, K.-D. ; Schmidt, M.

Weinheim : Wiley-Blackwell

Acta Polymerica 35 (1984), S. 257-260

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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 results of measurements of the thin film growth rate along the wall of long discharge tubes with flowing gas are presented. The dependence of the growth rate distribution along the tube wall on various parameters is discussed. The analysis of the conversion rate of the monomer to thin film material leads to important conclusions on the mechanism of glow polymer film formation.

Notes: Durch Ausmessen der Profile der Schichtabscheidungsrate entlang der Wand durchströmter langer Entladungsrohre lassen sich deren Abhängigkeiten von den verschiedenen Parametern diskutieren. Speziell die Auswertung des Umsetzungsgrades liefert wichtige Aussagen zum Mechanismus der Glimmpolymerschichtbildung.

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/actp.1984.010350402

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Chain stiffness of poly-methoxypropyl[1.1.1]propellane (1994)

Lassale, I. ; Schmidt, M. ; Schlüter, A. D.

Weinheim : Wiley-Blackwell

Acta Polymerica 45 (1994), S. 389-391

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ISSN: 0323-7648

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: The chain stiffness of a methoxypropyl-substituted poly[1.1.1]propellane in solution is investigated by static and dynamic light scattering. The Kuhn statistical segment length is determined as lk=150Å utilizing the Kratky-Porod wormlike chain model. It is, however, not yet clear whether the derived Kuhn length characterizes the chain stiffness of a perfect polypropellane chain or rather originates from “kinks” in the polymer backbone due to the presence of possible side reactions during polymerization.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/actp.1994.010450510

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Infrared and Raman studies on calcium, zinc and cadmium hydroxide halides Ca{O(H,D)}Cl, Cd{O(H,D)}Cl, Zn{O(H,D)}F and β-Zn{O(H,D)}ClContribution LXXIX in a series of papers on lattice vibration spectra. For Part LXXVIII, see K. Beckenkamp, H. D. Lutz, H. Jacobs and U. Metzner, J. Solid State Chem. in press. (1993)

Lutz, H. D. ; Schmidt, M. ; Weckler, B.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 24 (1993), S. 797-804

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ISSN: 0377-0486

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: IR and Raman spectra of Zn(OH)F, β-Zn(OH)Cl and isostructural Ca(OH)Cl and Cd(OH)Cl and of deuterated specimens recorded at ambient and liquid nitrogen temperature are presented and assigned to OH(OD) stretching, librational and translational modes. The spectra obtained are discussed on the basis of the layered crystal structures of these hydroxide halides. The main results are (i) detection and proof of the presence of very weak hydrogen bonds in the case of M(OH)Cl (M = Ca, Cd) and for OH(2) of Zn(OH)F [in addition to ordinary hydrogen bonds in the case of β-Zn(OH)Cl and OH(1) of Zn(OH)F] with OH stretching wavenumbers of the corresponding hydroxide ions partially greater than that of free, gaseous OH- ions, (ii) a less symmetrical structure of Ca(OH)Cl and Cd(OH)Cl compared with that obtained from the heavy atoms alone and (iii) proof of the presence of two different kinds of hydroxide ions in nearly equal amounts in Zn(OH)F containing two lattice sites each occupied by F- and OH-. The high-energy shift of the OH modes mentioned above is attributed to the synergetic effect.

Additional Material: 11 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jrs.1250241113

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Redox stratification of an ancient lake in Gale crater, Mars (2017)

Hurowitz, J. A., Grotzinger, J. P., Fischer, W. W., McLennan, S. M., Milliken, R. E., Stein, N., Vasavada, A. R., Blake, D. F., Dehouck, E., Eigenbrode, J. L., Fairen, A. G., Frydenvang, J., Gellert, R., Grant, J. A., Gupta, S., Herkenhoff, K. E., Ming, D. W., Rampe, E. B., Schmidt, M. E., Siebach, K. L., Stack-Morgan, K., Sumner, D. Y., Wiens, R. C.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2017-06-02

Description: In 2012, NASA’s Curiosity rover landed on Mars to assess its potential as a habitat for past life and investigate the paleoclimate record preserved by sedimentary rocks inside the ~150-kilometer-diameter Gale impact crater. Geological reconstructions from Curiosity rover data have revealed an ancient, habitable lake environment fed by rivers draining into the crater. We synthesize geochemical and mineralogical data from lake-bed mudstones collected during the first 1300 martian solar days of rover operations in Gale. We present evidence for lake redox stratification, established by depth-dependent variations in atmospheric oxidant and dissolved-solute concentrations. Paleoclimate proxy data indicate that a transition from colder to warmer climate conditions is preserved in the stratigraphy. Finally, a late phase of geochemical modification by saline fluids is recognized.

Keywords: Geochemistry, Geophysics, Online Only, Planetary Science

Print ISSN: 0036-8075

Electronic ISSN: 1095-9203

Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

Published by American Association for the Advancement of Science (AAAS)

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