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Author: British Museum. Department of Printed Books
Publisher:
ISBN:
Category : English imprints
Languages : en
Pages : 520
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Author: British Museum. Department of Printed Books
Publisher:
ISBN:
Category : English imprints
Languages : en
Pages : 520
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Book Description
Author: British Library
Publisher:
ISBN:
Category : Best books
Languages : en
Pages : 640
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Author: Robert L. Feller
Publisher: Getty Publications
ISBN: 0892360992
Category : Art
Languages : en
Pages : 173
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This report is the result of a three-year research program. It describes the chemical character of cellulose ethers as a general class of polymers and establishes an approximate ranking of the relative stability of each generic chemical subclass. Ranking the thermal stability of the polymers with respect to color change and loss in degree of polymerization led to the conclusion that as generic chemical classes, methylcellulose and carboxymethylcellulose appear to be the most stable of the cellulose ethers. Water-soluble ethylhydroxyethylcellulose apparently also possesses good stability. Of questionable long-term stability are hydroxyethylcellulose and hydroxy- propylcellulose. Ethylcellulose and organic-soluble ethylhydroxyethylcellulose proved to be of poor stability, potentially undergoing marked changes in twenty years or less under normal museum conditions. An important additional conclusion reached here, as well as in an earlier investigation, is that considerable variations in stability can occur within a generic chemical class from differences in the basic raw material, a natural product from plants, which is not a uniform, manufactured, chemical substance. Further variations can exist due to different manufacturing processes or commercial sources. Hence, commercial products must be evaluated individually to determine the most stable of a given generic type. Nonetheless, the authors believe the conclusions expressed here to be valid with regard to the relative stability of the generic chemical classes of cellulose ethers.
Author: Royal Institute of Chemistry
Publisher:
ISBN:
Category :
Languages : en
Pages : 394
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Author: Royal Institute of Chemistry
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 794
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Author:
Publisher:
ISBN:
Category : Books
Languages : en
Pages : 470
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Author:
Publisher:
ISBN:
Category : Chemical industry
Languages : en
Pages : 940
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Book Description
Contents.--v. 1. Air, water, inorganic chemicals and nucleonies.
Author: Los Angeles County Public Library
Publisher:
ISBN:
Category : Library catalogs
Languages : en
Pages : 370
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Author:
Publisher:
ISBN:
Category : Cosmetics
Languages : en
Pages : 1598
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Author: United Kingdom Institute for Conservation. Archaeology Section
Publisher:
ISBN:
Category : Architecture, Egyptian
Languages : en
Pages : 120
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