Adhesives, cellulosic

Backing and Tear-repair. The methods and materials proposed for lining include the following (a) mulberry paper attached with starch (rice or wheat), methylcellulose, or carboxymethyl-cellulose adhesives (18 19), (b) contemporary tapa attached with starch or cellulose-derived adhesives (20 21), (c) nylon laminating tissue and heat-set polyamide resin (22) and (d) stitched backings. 

Cellulose forms the backbone of many important industrial adhesives (52), Professor David Hon of Clemson University reviews the use of cellulosic adhesives in Chapter 21. 

Cellulose is an old polymer with new industrial applications. The derivatization of cellulose has opened up tremendous production and marketing possibilities for the adhesives industry. Various important adhesives have been derived from cellulose ethers. The structure and molecular size of cellulose and their influence on swelling and solubility are important considerations in the preparation of cellulose derivatives for adhesive applications. Modern cellulosic adhesives derived from grafted copolymers and polyblends are also proving very useful. 

Two other filtration modules, which both formed part of automated radioimmunoassay systems, have been developed. - One of these, was based on conventional continuous flow techniques. At the filtration stage, a continuously moving strip of glass fiber filter paper was strengthened and wetted, the reaction mixture was filtered, and the precipitate was washed by two streams of buffer. The strip was dried and overlaid with cellulose adhesive tape before being counted as it passed between two end-window radioactivity detectors and wound onto a take-up spool. In the second system, glass fiber filter disks are mounted at intervals over perforated segments of a flexible plastic carrier tape. The contents of five... 

Cellulosics. Cellulosic adhesives are obtained by modification of cellulose [9004-54-6] (qv) which comes from cotton linters and wood pulp. Cellulose can be nitrated to provide cellulose nitrate [9004-70-0], which is soluble in organic solvents. When cellulose nitrate is dissolved in amyl acetate [628-65-7], for example, a general purpose solvent-based adhesive which is both waterproof and flexible is formed. Cellulose esterification leads to materials such as cellulose acetate [9004-55-7], which has been used as a pressure-sensitive adhesive tape backing. Cellulose can also be ethoxylated, providing hydroxyethylcellulose which is useful as a thickening agent for poly(vinyl acetate) emulsion adhesives. Etherification leads to materials such as methylcellulose [9004-67-5] which are soluble in water and can be modified with glyceral [56-81-5] to produce adhesives used as wallpaper paste (see Cellulose esters Cellulose ethers). 

Bowen et al. [39] measured directly the adhesion (interaction) of cellobiose and cellulose with two polymeric UF membranes of similar MWCO, but of different materials. As probes, they used silica spheres (diameter 5-8 im) the surfaces of which were modified by static adsorption of cellobiose. They also used pure cellulose probes. Membrane ES 404 was made of poly(ether sulfone) alone, and EM 006 was made of a poly(ether sulfone)-polyacrylate blend, chosen specifically to increase the hydrophihc properties and decrease the fouling properties of the membrane. Study of ES 404 and EM 006 had shown that the interaction of cellobiose or of colloidal cellulose with the membranes was such that ES 404 always had the greater adhesion and greater fouling tendency. However, if the membrane was first fouled with cellobiose, the colloidal cellulose adhesion force was increased significantly, and the differences between the membranes diminished. Bowen et al. suggested that in the future, it would be possible to use the techniques developed to allow prior assessment of the fouUng propensity of process streams with different types of membranes. 

As a second example, consider the case of wallpaper stuck to a plaster surface with a water-based cellulose adhesive. The adhesive certainly has to penetrate both surfaces by processes that are certainly a type of diffusion. As the water is lost by evaporation and... 

Pulp, paper, cellulose (adhesives, printing, newspapers, books) 1.21... 

Cellulosic adhesives - Cellulose is a naturally occurring water insoluble polymer which is a major component of plants - wood is 60% cellulose. It is a polysaccharide very similar to starch except that the saccharide imits of the macromolecules are eonnected by beta-linkages in contrast to the alpha linkage for starch. Cellulose ean be reacted with various acids to produce water soluble adhesives such as methylcellulose, hydroxyethylcellulose, and carboxymethylcellulose, or organic solvent soluble polymers such as hydroxypropylcellulose and cellulose acetate. The polymers have molecular weights of about 25,000 and are used for adhesives in paper, textile, plastic, and leather shoes. 

Cellulose adhesive is made from a natural polymer found in trees and woody plants. It is the adhesive used on the cellophane wrapper on cigarette packs, the adhesive on decals we put on windows and, interestingly enough, the adhesive used on the strip-pahle wallpaper we have in our homes that allows us to remove the paper easily. 

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