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  • Articles  (6)
  • Other Sources
  • 1980-1984  (6)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (6)
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  • Articles  (6)
  • Other Sources
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  • 1
    Electronic Resource
    Electronic Resource
    Grafting onto wool (1980)
    Springer
    Polymer bulletin 3 (1980), S. 115-121 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In order to ascertain the role of -SH groups in graft copolymerization of vinyl monomers onto Himachali wool fiber, an attempt has been made to graft copolymerize ethylacrylate (EA) onto reduced wool, in the presence of cerie sulfate (CS) as redox initiator in aqueous medium. Reduction of wool was carried out with thioglycolic acid (TGA) in aqueous solution. Percentage of grafting and percent efficiency were determined as functions of (a) Concentration of initiator (CS), (b) Concentration of monomer (EA), (c) Concentration of Sulfuric acid, (d) Time and (e) Temperature. Reduction of wool does not promote grafting of EA. The unreduced wool during ceric ion-initiated grafting of EA was reported earlier from this laboratory to produce more grafting. In ceric ion-initiated grafting of vinyl monomer onto wool, -SH groups do not play significant role. A plausible mechanism of grafting of EA onto reduced wool in the presence of ceric ion initiator has been suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263214
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Grafting onto wool. VII. Ceric ion-initiated graft copolymerization of vinyl monomers. Comparison of monomer reactivities (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 235-241 
    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
    Notes: In an attempt to compare relative reactivities of vinyl monomers toward grafting, methyl methacrylate (MMA) and acrylic acid (AAc) were grafted separately to Himachali wool in aqueous medium by using ceric ammonium nitrate (CAN) as redox initiator. Nitric acid was found to catalyze the reaction. Percent grafting was determined as a function of concentration of nitric acid, concentration of CAN, concentration of monomer, time, and temperature. Optimum conditions for maximum grafting were evaluated for each monomer and were found to depend upon the nature of the monomer. Reactivities of MMA and AAc toward grafting were compared with those of methyl acrylate (MA), ethyl acrylate (EA), and vinyl acetate (VAc) reported earlier from this laboratory and were found to follow the order MA 〉 EA 〉 MMA 〉 VAc 〉 AAc. An explanation for the observed order of reactivity of different vinyl monomers is presented.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250209
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  • 3
    Electronic Resource
    Electronic Resource
    Grafting onto wool. XI. Graft copolymerization of poly(vinyl acetate) and poly(methyl acrylate) onto reduced wool in presence of potassium persulfate-ferrous ammonium sulfate (KPS - FAS) system as redox initiator (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 3789-3796 
    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
    Notes: In an attempt to ascertain the role of - SH groups of Himachali wool during graft copolymerization, poly(viny acetate) (PVAc) and poly(methyl acrylate) (PMA) were graft copolymerized onto reduced wool by using potassium persulfate - ferrous ammonium sulfate (KPS - FAS) redox pair in aqueous medium. Reduction of wool was carried out by sodium bisulfite solution of varying concentrations for different reaction periods. Concentration of reducing agent and the extent of reduction were found to influence grafting of vinyl monomers. Maximum grafting of methyl acrylate (MA) and vinyl acetate (VAc) occurred when wool was reduced by 1% and 0.5% NaHSO3 solution, respectively, for 24 h. Increase in percent grafting of MA onto reduced wool compared to that of unreduced wool has been ascribed to the production of more - SH groups by reduction of - SS - groups of wool fiber.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070261125
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  • 4
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    Unknown
    Grafting onto wool (1980)
    Springer
    Details
    Publication Date: 1980-01-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 5
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    Droplet drag in an accelerating and decelerating flow (1982)
    Cambridge University Press
    Details
    Publication Date: 1982-03-01
    Description: An experimental study of the motion of small water droplets in both accelerating and decelerating conditions is presented. Droplets with diameters in the range 115-187/im were exposed to propagating N-waves having strengths smaller than 0-03. Droplet-displacement data were obtained by single-frame stroboscopic photography, at an equivalent framing rate of 4000 pictures per second. The data were fitted by means of best-fit polynomials in time, which were used to obtain drag coefficients in accelerating and decelerating flow conditions. In addition to providing drag data for impulsive-type motions, these data show that the unsteady drag follows two entirely distinct trends. In one, applicable to decelerating relative flows, the unsteady drag is always larger than the steady drag at the same Reynolds number. In the other, applicable to accelerating relative flows, the unsteady drag is always smaller than the corresponding steady value. These trends have not been previously known. They give some support to a mechanism recently proposed (see Temkin & Kim 1980) to explain departures of the drag coefficient for a sphere from its steady value; namely, the changes in size of the recirculating region behind the sphere, relative to its steady counterpart at the same Reynolds number. © 1982, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 6
    facet.materialart.
    Unknown
    Temperature distribution in a large circular plate heated by a disk heat source (1983)
    Elsevier
    Details
    Publication Date: 1983-07-01
    Print ISSN: 0017-9310
    Electronic ISSN: 1879-2189
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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