Cellulose bonds

A reactive dye—cellulose bond is subject to some slight hydrolysis during washing under alkaline conditions. 

Element Cellulose Bond Paper TNT RDX TETRYL PETN... 

Franco, P., Senso, A., Minguillon, C., and Oliveros, L. (1998) 3,5-Dimethylphenylcarbamates of amylose, chitosan and cellulose bonded on silica gel. Comparison of their chiral recognition abilities as high-performance liquid chromatography chiral stationary phases, J. Chromatogr. A 796, 265-272. 

Cellulose is a carbohydrate that supports or protects plants. Like starch, it is made of repeating units of glucose. The bonds between the glucose molecules in cellulose are different from the bonds in starch. This matters a great deal, because enzymes in the human body can break the bonds in starch to produce glucose, but they cannot break the cellulose bonds and make glucose from it. This is why cereal or corn (starch) can be eaten, but not wood (cellulose). 

Resins may influence phototendering of rayons. Wood (26) has reported that viscose rayon fabrics treated with urea formaldehyde or thiourea formaldehyde resin are protected from the degradative effects of mercury vapor lamp radiation. The mechanism of the protective effect is not fully understood as yet. Possibly resins can quench free radicals formed during irradiation. Work with resin-treated cotton indicates that simultaneous scission of cellulose chain molecules and resin-cellulose bonds occurs on exposure to light (63). 

Pew JC, Weyna P (1962) Fine grinding, enzyme digestion, and the lignin cellulose bond in wood Tappi 45 247-256... 

Evidence for a chemical linkage between cellulose and mannan, at least in softwood pulps, continues to accumulate. In this connection, Steinmann and coworkers have observed that, during the normal preparation of cellulose acetate, a considerable part of the xylan may be lost (30 to 60%), whereas the mannan content is not greatly affected. These authors suggest that this may indicate that the mannan is bound to the anhydroglucose chain. According to these workers, certain differences in properties of cellulose acetate prepared from different samples of cellulose can be explained if a mannan-to-cellulose bond actually does exist. However, it must be realized that no definitive proof has been presented of a mannan-to-cellulose linkage in any preparation of wood cellulose. 

The rate of breakage of cellulose bonds in cotton is readily found from the changes in the degree of polymerization (DP) as exposure continues, using the cuprammonium fluidity as a measure of the DP. In jute, however, this method is not always satisfactory because it is difficult to achieve a complete dissolution of the cellulose component in cuprammonium hydroxide because of interference from the lignin in the fiber. Moreover, preliminary removal of lignin is not advisable, as whatever the process used, it is always liable to cause some degradation of the cellulose. 

Untreated OPS plywood showed decrease in bond strength due to the reaction of UF adhesive with water. Water hydrolyzes the aminomethylenic bond of the UF adhesive, and the action of water on UF-cellulose bonds is first to displace the UF adhesive from adsorption sites on the cellulose. Consequently, leaching of UF in the water results in poor shear strength in the wet test [17]. 

Surface analysis of cellulose ionically coated with HE and silicone with covalently immobilised HE were carried out by means of ESCA. Comparison between ESCA surface analysis and HPLC bulk analysis data show that ionically cellulose bonded HE penetrates into the partially quatemised cellulose membrane, because cellulose membranes will be degraded by introducing quatemised amino groups via the reagent QUAB (N,N,N,-3-chloro-2-hydroxypropyltrimethylammonium chloride). The reaction with less degraded cellulose membranes leads to more specific surface reactions. 

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