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  • Chemistry  (5)
  • Conducting polymers
  • 1960-1964  (4)
  • 1945-1949  (1)
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Year
  • 1
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Methacrylic anhydride was polymerized, in high yields, at temperatures ranging from 1 to 80°, in benzene solution, to linear, soluble polymers. The polymethacrylic anhydride so prepared was hydrolyzed to the corresponding polymethacrylic acid and this poly(acid) esterified by reaction with diazomethane to yield polymethyl methacrylate. The result is given of an x-ray diffraction study of an unstretched film of polymethyl methacrylate prepared in a similar manner. The determination of the fraction of the polymer present in each of the three possible stereoconfigurations, isotactic, syndiotactic, and heterotactic, was made from a nuclear magnetic resonance investigation of the derived polymethyl methacrylate. The results indicate that the stereoconfiguration is influenced by the cyclic polymerization mechanism. The results also indicate that there is a bias toward increasing isotactic character in the polymers with an increase in polymerization temperature. Two possible explanations are offered: one in terms of a kinetic control of the steric placements and the other in terms of a balance between equilibrium and kinetic considerations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 2 (1947), S. 275-280 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Tetrachlorophthalic anhydride (TCPA) was reacted with cellulose diacetate and with cellulose diethyl ether in dioxane solution to produce esters with rather low tetrachlorophthalyl contents. Phthalic anhydride was found to be considerably more reactive than was TCPA with these cellulose derivatives, especially if pyridine was used as the reaction solvent. Acylations could not be executed with TCPA in the presence of pyridine as solvent, however, because this material decomposed the anhydride, removing chlorine from it. The TCPA derivatives were more limited in solubility than were the corresponding esters made from phthalic anhydride.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: It is demonstrated that the bonding characteristics of commercial liquid adhesive primers made from nitrile rubbers and phenol-formaldehyde polymers, cured by means of hexamethylenetetramine can be quite sensitive to the presence of small amounts of excess water and ammonia. The added water partially decomposes the hexamethylenetetramine to formaldehyde and ammonia, the concentration of the latter thus increasing to such a point as to promote a lower temperature curing of the phenolic resin. Restoration of the original adhesive properties can be attained by the addition of reagents which remove either the water or the ammonia, or both, from the adhesive. Examples of such reagents are certain organic acids, anhydrides and peroxides. The addition of these reagents has been found to reactivate and increase greatly the useful lives of nitrile-phenolic liquid adhesive primers containing hexamethylenetetramine.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 10 (1964), S. 502-508 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The inherent uncertainty of the critical heat flux in saturated pool boiling has been inconclusively debated for some time. In an effort to ascertain this uncertainty a series of 234 tests was conducted at atmospheric pressure with saturated water outside horizontal, a.c. heated, 0.234-in. O.D., A-nickel tubes in an open 6 × 6 × 9-in. deep pool. Approximately fifty tests were conducted with each of four test sections which were protected from physical burnout by a detector circuit which terminated the applied current before the wall temperature exceeded approximately 450°F. The maximum relative uncertainty in the derived values of critical heat flux was ±3%.For all the tests the minimum, average, and maximum critical fluxes were 0.201 × 106, 0.436 × 106, and 0.596 × 106 B.t.u./hr. sq. ft., respectively, and the average critical wall superheat was 41°F. The surface roughness of the test sections remained essentially unchanged during the program. The data show that there is an inherent uncertainty or scatter band in the critical heat flux under conditions of minimum surface variability, and that solely hydrodynamic theories of burnout do not fully represent the phenomenon, since surface condition can constitute a significant influence.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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