Glues/pastes

Viscosity of Polymer Solutions. Polymer solutions are very common. Glues, pastes, and paints are just a few examples of commercially available aqueous suspensions of organic macromolecules. Also, recall from Chapter 3 that certain types of polymerization reactions are carried out in solution to assist in heat removal. The resulting polymers are also in solution, and their behavior must be fully understand in order to properly transport them and effect solvent removal, if necessary. 

An adhesive may be defined as a material which when applied to surfaces of materials can join them together and resist separation. Adhesive is the general term and includes cement, glue, paste, etc. and these terms are all used essentially interchangeably. Various descriptive adjectives are often applied to indicate certain characteristics. For example, to indicate the physical form of the adhesive, e.g. liquid adhesive, liquid two-part adhesive, film adhesive its chemical form, e.g. epoxy adhesive, cyanoacrylate adhesive, polychloroprene adhesive to indicate the type of materials bonded, e.g. metahto-metal adhesive, paper adhesive, wood adhesive or to show the conditions of use, e.g. solvent based adhesive, cold-hardening, or -curing, adhesive, hot-melt adhesive. 

Nonfood preservative appHcations of sodium and potassium benzoate are found in pharmaceutical and cosmetic preparations, such as toothpastes and powders, tobacco, pastes and glue, as well as starch and latex (36,37). 

Liquid Diffusion The movement of liquids by diffusion in soUds is restricted to the equihbrium moisture content below the point of atmospheric saturation and to systems in which moisture and solid are mutually soluble. The first class apphes to the last stages in the diying of clays, starches, flour, textiles, paper, and wood the second class includes the diying of soaps, glues, gelatins, and pastes. 

Material that holds parts together by surface attachment. Examples include glue, mucilage, paste and cement. Various forms of adhesives include liquid or tape adhesives (physical type) and silicate or resin adhesives (chemical type). 

Buchblnder-gold, n. bookbinder s gold, leaf gold, -kleister, m. bookbinder s paste, -leim, m. bookbinder s glue, -pappe, /. binder s board. 

Kreide-papier, n. enameled paper, art paper, -paste,/, a cement of chalk and glue, -piilver, n. chalk powder, -stein, m. chalkstone. -stift, m. crayon, kreldlg, a. chalky, cretaceous. 

Pappel,/. poplar mallow, -art, /. (variety of) poplar (variety of) mallow, -holz, n. poplar (wood), -kraut, n. mallow, pappen, v.t. i. paste work in paperboard. Pappen-art, /. (paper)board. -deckel, m. = Pappdeckel. -fabrik, /. (paper) board mill, -guss, m. cast paperboard, pressboard, mill-board. -leim, m. pasteboard glue, -stiel, m. trifle. 

Seifea-kocher, m. soap boiler, -kraut, n. soap plant, soap weed, -krem, m. soap cream, -lauge, /. soap solution, soap suds, -leim, m. soap glue, soap paste Paper) soap size. 

Ge resistors are specifically produced for low-temperature thermometry carbon and Ru02 resistors are commercial products for electronics. Pure carbon is not a semiconductor. The negative slope R(T) is due to the production process which consists in pressing and sinterization of carbon particles with glue. The resulting resistance is probably determined by the contact resistance between the particles. The cost of the carbon resistor thermometer is very low. Manufacturers such as Speer, Allen-Bradley and Matsushita have produced in the past carbon resistors for many years. Most of firms have now ceased manufacture, although their products may still be found in the storerooms of research laboratories. 

In the past, natural resins served as universal adhesives for fixing stone points and blades to hafts of wood or antler, to glue feathers to arrow shafts and for repairing materials such as broken pottery and bone combs. As sealants, resins were used to coat the surfaces of pottery and basketry in order to provide an impermeable lining. Resins were also used to waterproof hunting equipment and fishing nets, as well as canoes and ships from Noah s Ark (Genesis 6 14) to... 

Starch glues are water dispersions for libraiy paste and wallpaper paste. They coat paper for better receptivity of inks and keep the inks held out on the paper surface. They are also used in corrugated cardboard and paper laminating. 

Adhesives are used in everyday applications. Adhesives may be in liquid form or thick pastes. Their main mechanism is based on the polymerization or crosslinking of polymers, which gives rise to glue or other adhesive application. The degree of adhesion of such a process is determined by conventional technological tests. 

Heath and Frost patented in 1877 the use of a water-retaining paste such as soap 5, starch 0.5, glue 0.5 water 94% for tamping bore-holes, loaded with dynamite, in order to prevent the ignition of firedamp Ref Daniel (1902), 371... 

Dextrin also has been and is now used as a binder in various pyrotechnic compos (Ref 11) Davis (Ref 5, pp 62ff) gives numerous examples. As a binder a desensitizer it has been used in primer compns, as for example in a friction primer used for an airplane flare (Ref 5, p 454), or in a compn. for electric primers consisting of K chlorate 88, charcoal 10 dextrin 2% (Ref 9, p 118). As a fuel dextrin was used in some commercial expls, such as Nobelit "Fordit (Ref 2, p 407). In some gelatine expls, such as "Safety Jelly Dynamite (Ref, p 407), a paste called "glue-dextrine-glycerine jelly was used... 

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