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Evaluation of Cellulose Ethers for Conservation
Myron H. Wilt , Robert L. Feller
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.
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