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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. ; [weitere]

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

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

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: 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.

Zusätzliches Material: 21 Ill.

Materialart: Digitale Medien

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

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Digitale Medien

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

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Beschreibung / Inhaltsverzeichnis: 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.

Notizen: 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.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

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

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Flow in out-of-plane double S-bonds (1986)

Schmidt, M. C. ; Whitelaw, J. H. ; Yianneskis, M.

In: CASI

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Publikationsdatum: 2019-06-28

Beschreibung: Developing flows in two out-of-plane double S-bend configurations have been measured by laser-Doppler anemometry. The first duct had a rectangular cross-section 40mmx40mm at the inlet and consisted of a uniform area 22.5 deg. - 22.5 deg. S-duct upstream with a 22.5 deg.- 22.5 deg. S- diffuser downstream. The second duct had a circular cross-section and consisted of a 45 deg. - 45 deg. uniform area S-duct upstream with a 22.5 deg. -22.5 deg. S-diffuser downstream. In both configurations the ratio of the mean radius of curvature to the inlet hydraulic diameter was 7.0, the exit-to-inlet area ratio of the diffusers was 1.5 and the ducts were connected so that the centerline of the S-duct lay in a plane normal to that of the S-diffuser. Streamwise and cross-stream velocity components were measured in laminar flow for the rectangular duct and in turbulent flow for both configurations; measurements of the turbulence levels, cross-correlations and wall static pressures were also made in the turbulent flow cases. Secondary flows of the first kind are present in the first S-duct and they are complemented or counteracted by the secondary flows generated by the area expansion and by the curvature of the S-diffusers downstream. Cross-stream velocities with magnitudes up to 0.19 and 0.11 of the bulk velocity were measured in the laminar and turbulent flows respectively in the rectangular duct and six cross-flow vortices were evident at the exit of the duct in both flow cases. The turbulent flow in the circular duct was qualitatively similar to that in the rectangular configuration, but the cross-stream velocities measured at the exit plane were smaller in the circular geometry. The results are presented in sufficient detail and accuracy for the assessment of numerical calculation methods and are listed in tabular form for this purpose.

Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER

Materialart: NASA-CR-176981 , NAS 1.26:176981 , FS/86/30

Format: application/pdf

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