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:
Mercerized cellulose in the form of 7/2 yarn was reactivated with 17.5% sodium hydroxide and then heated at 100°C. with 5 moles of trityl chloride, in pyridine, per anhydroglucose unit. The time of reaction was varied, giving ether derivatives of the cellulose containing 0.31-0.79 triphenylmethyl groups (DS) per anhydroglucose unit. Controls consisted of (1) the untreated cellulose yarn and (2) a portion subjected to all the reaction conditions except the reactant. The density of the product decreased hyperbolically with increasing substitution. The mixed x-ray pattern of the untreated control cellulose (35% cellulose I, 43% cellulose II) was largely converted by the activation treatment (10% cellulose I, 53% cellulose II). As reaction proceeded the crystal structure largely disappeared. The assumption is that substitution was confined almost exclusively to the primary hydroxyl position. The behavior of tensile stiffness, elastic recovery, and work recovery was explored at temperatures from about 25 to 225°C. Considerable improvement, which generally increased with increasing substitution, was observed in both elastic and work recovery at all temperatures studied.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1968.070120520
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