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  • 1965-1969  (2)
  • Chemistry  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1845-1858 
    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: Mercaptan and disulfide contents of modified cotton fabrics could be determined by application of Leach's polarographic method for wool, with minor modification.It was found that mercaptocellulose prepared by the reaction of tosyl cellulose and potassium thiolacetate followed by alkaline hydrolysis contained considerable amounts of disulfided in addition to mercaptain. Iodometric titration of mercaptocellulose gave a higher value of mercaptan than that obtained by the polarographic method. The mercaptan and disulfide contents and methylene blue uptake of the iodine-treated samples indicate that some of the mercaptan groups further undergo oxidation to acidic groups as a result of the iodine treatment.The spatial effect in the oxidation of mercapto groups in modified cotton is briefly discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 99 (1966), S. 232-242 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Copolymerisation von Tetrahydrofuran (THF) mit Diketen (DK) bei 0°C mit einem Triäthylaluminium/Wasser-System als Initiator, führt zu schwach gelben, festen Produkten. Der Nachweis fär eine Copolymerisation wurde durch IR-Analyse der benzolunlöslichen Fraktion erbracht; hierbei wurden Banden gefanden, die kristallinem Poly-THF zuzuordnen sind. Außerdem liefert die alkalische Hydrolyse dieser Fraktion homopolymere Tetrahydrofurane mit Molekulargewichten zwischen 1500 und 3100; sie besitzen OH- und COOH-Endgruppen. Diese experimentellen Befunde bestätigen die Annahme, daß es sich hier um Block-Copolymere und nicht um statische Copolymere handelt.
    Notes: Copylymerization of tetrahydrofuran (THF) with diketene (DK) was carried out at O°C. using the triethylaluminum/water-system as catalyst. The produced polymer was a yellow solid. The formation of a copolymer was shown by the existence of THF units in the benzene-insoluble fraction of the polymeric product. The IR-spectrum of the benzeneinsoluble fraction had a band which can be ascribed to the crystalline poly-THF. Furthermore poly-THF having molecular weights of 1,500 to 3,100 was isolated from the hydrolyzed mixture of the benzene-insoluble fraction high yield; it has OH- and COOH-end groups. These facts have been taken to assume that the copolymerization of THF with DK leads to the formation of block copolymers instead of random copolymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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