Cellulosics cellulose acetate

Carboxymcthyl cellulose Cellulose acetate phthalate Cellulose Dextrin... 

Macromolecules may be classified according to different criteria. One criterion is whether the material is natural or synthetic in origin. Cellulose, lignin, starch, silk, wool, chitin, natural rubber, polypeptides (proteins), polyesters (polyhydroxybutyrate), and nucleic acids (DNA, RNA) are examples of naturally occurring polymers while polyethylene, polystyrene, polyurethanes, or polyamides are representatives of their synthetic counterparts. When natural polymers are modified by chemical conversions (cellulose —> cellulose acetate, for example), the products are called modified natural polymers. 

Many membrane materials have been developed and are used for hemodialyzers. Today, these include regenerated cellulose, cellulose acetate, polyacrylonitrile, poly(methylmethacrylate), vinyl alcohol-ethylene copolymer, polysulfone, polyamide, and others. 

Cellite. A plastic compd used in films, etc prepd by mixing an alcoholic soln of the lower acetylated products of cellulose(cellulose acetate) with camphor, followed by drying. 

Rapid method for the detn of N content in NC s by the ferrous ammonium sulfate method, using as the "standard a NC of known N content, previously detd by nitrometer) 19)K.Thinius, Farbe u Lack 56, 3-9(1950) CA 44, 4817 (1950)(Luminescence analysis for indentification of NC, cellulose, cellulose acetate, ethylcellulose methylcellulose) 20)L.B.Genung, AnalChem 22, 403(1950) CA 44, 6l21(1950)(Detn of N content by nitrometer) 21)R.Leclercq J. 

It is used as a solv for acetyl cellulose, cellulose acetate, resins, gums, etc and serves as an intermediate in org synthesis for the prepn of some expls... 

Allyl-diglycol-carbonate polymer Diallyl phthalate (DAP) polymer Cellulosics Cellulose acetate resin Cellulose-acetate-propionate resin Cellulose-acetate-butyrate resin Cellulose nitrate resin Ethyl cellulose resin Rayon... 

Cellulosics cellulose-acetate-butyrate and cellulose-acetate- F N N N N N N G F N N N ... 

Finally, PSPs based on the OEP metal complexes in various cellulose derivative polymers also have been introduced. Cellulose derivative polymers such as ethyl cellulose, cellulose acetate etc., as shown in Fig. 9, also provide a mechanical strength to thin film. The oxygen permeability, diffusion constant, and solubility for oxygen for typical cellulose derivative polymers are listed in Table 1. Cellulose derivative polymer films with plasticizer tributyl phosphate (TBP) have large oxygen permeability. Cellulose acetate with TBP... 

Disperse Dyes. These are substantially water-insoluble nonionic dyes for application to hydrophobic fibers from aqueous dispersion. They are used predominantly on polyester and to a lesser extent on nylon, cellulose, cellulose acetate, and acrylic fibers. Thermal transfer printing and dye diffusion thermal transfer (D2T2) processes for electronic photography represent niche markets for selected members of this class (see Chapter 6). 

There are two types of membranes, cellulosic and synthetic or polymeric ones. Cellulosic membranes can be in regenerated cellulose (cuprophan, Bioflux from Membrana, Germany) or modified cellulose (cellulose acetate or diacetate, from Asahi, triacetate cellulose from Baxter and Nipro, which has a high hydraulic permeability or Hemophan from Membrana). Cuprophan was originally the most common one, because of its low cost, but is no longer produced because of its lower biocompatibility and hydraulic permeability. A wide variety of polymeric membranes are now available with both high and medium hydraulic permeabilities. Only the Eval... 

Cellulosics (Cellulose Acetate, Cellulose Acetate Butyrate, Cellulose Propionate, Ethyl Cellulose, Cellulose Nitrate). Cellulosics are among the toughest of plastics. However, they are temperature-limited and are not as resistant to extreme environments as other thermoplastics. The four most prominent industrial cellulosics are cellulose acetate, cellulose acetate butyrate, cellulose propionate, and ethyl cellulose. A fifth member of this group is cellulose nitrate. 

Cellulosics cellulose, cellulose acetate, cellulose acetate butyrate, cellulose nitrate, cellulose propionate, ethyl cellulose Methanol, isopropanol 1. Abrasion. Grit or vapor blast or 220-grit emery cloth followed by solvent degreasing. 2. After procedure 1, dry the part at 100°C for 1 h and apply adhesive before the plastic cools to room temperature. For general-purpose bonding... 

Sucrose Starch Dextrin Cellulose Cellulose acetate C12H22O1I s 1348.9 g cal/gra 4177 4108 4179 4495... 

Plastics that are commonly processed by extrusion include acrylics (polymethacrylates, polyacrylates) and copolymers of acrylonitrile cellulosics (cellulose acetate, propionate, and acetate butyrate) polyethylene (low and high density) polypropylene polystyrene vinyl plastics polycarbonates and nylons. The material properties and extrusion properties have been reviewed by Whelan and Dunning.Additives that may be included to modify or enhance proper-ties include lubricants and antislip agents to assist processing during extrusion plasticizers to achieve softness and flexibility stabilizers and antioxidants to retard or prevent degradation and dyes and pigments. 

Carboxymethyl cellulose cellulose acetate cellulose acetate phthalate cellulose, microcrystalline ethylcellulose hypromellose hypromellose phthalate hydroxyethyl cellulose hydroxy-propyl cellulose methylcellulose. 

Semisynthetic cellulosics (rayon, methyl-cellulose, cellulose acetate), modified starches (starch acetate, etc.)... 

As far as biopolymers other than plain cellulose are concerned, grafting has been reported for crosslinked cellulose, oxidized cellulose, carboxymethylated cellulose, cellulose acetate and even for crosslinked derivatives. The grafted material content is usually given as the ratio of the increase in weight to the initial cellulose weight. 

In HPLC, a large variety of analyte types have been resolved on columns packed with derivatized cellulose. Cellulose acetate, benzoate, and carbamate derivatives provide CSPs that will separate a very broad range of analyte types, although a single CSP may not have broad applicability to a wide variety of analytes, and derivatization may be required. Separation is achieved by donor-acceptor interactions, with inclusion phenomena sometimes playing a secondary role. 

Topical microporous-membrane materials used in dialysis are hydrophilic, including cellulose, cellulose acetate, and various acid-resistant polyvinyl copolymers, typically less than 50 pm thick and with pore diameters of 15 to 100 A. Dialysis membranes can be thin because pressures on either side of the membrane are essentially equal. The most common membrane modules are plate-and-frame and hollow-fiber. Compact hollow-fiber hemodialyzers, which are widely used, typically contain several thousand 200-pm-diameter fibers with a wall thickness of 20-30 pm and a length of 10 to 30 cm (Seader and Henley, 2006). 

See AIao Cellulose Cellulose Acetate Cellulose Xanthate... 

Microcrystalline cellulose Cellulose acetate Cellulose acetate butyrate Cellulose acetate phthalate... 

Other cellulosics, cellulose acetate butyrate and propionate are cemented in accordance with the technique described for cellulose acetate. In the case of dope cements, the plastic to be dissolved in solvents is cellulose propionate. Similarly for ethyl cellulose plastic, the strongest bonds are made by solvents or by solvents bodied with ethyl cellulose plastic. 

A second polymer based on modified cellulose, cellulose acetate, was also one of the earliest commercial polymers. This material is obtained by... 

Poly(methyl acrylate-co-methyl methacrylate-co-methacrylic acid) 7 3 1 Poly(methacrylic acid-co-methyl methacrylate) 1 2 Hydroxypropyl cellulose Ethyl cellulose Cellulose acetate butyrate Cellulose acetate phthalate Poly(ethylene oxide)... 

Natural polymers Cellulose Cellulose acetate trimellitate (CAT)... 

---