Polymers Cellulose Acetate

The solution process consists of four steps preparation of cellulose for acetylation, acetylation, hydrolysis, and recovery of cellulose acetate polymer and solvents. A schematic of the total acetate process is shown in Figure 9. 

Acetate fibers are dyed usually with disperse dyes specially synthesized for these fibers. They tend to have lower molecular size (low and medium energy dyes) and contain polar groups presumably to enhance the forces of attraction by hydrogen bonding with the numerous potential sites in the cellulose acetate polymer (see Fibers cellulose esters). Other dyes can be appHed to acetates such as acid dyes with selected solvents, and azoic or ingrain dyes can be apphed especially for black colorants. However thek use is very limited. 

For acid-labile drugs, a coating of wax or of a cellulose acetate polymer is used to prevent disintegration of solid dosage forms in the stomach. Accordingly, disintegration and dissolution will take place in the duodenum at normal speed (A, track 1) and drug liberation per se is not retarded. 

By the year, 1910, the brothers Camille and Henry Dreyfus had discovered a practical method for producing cellulose acetate polymer and were making plastic film and toilet articles in Basel, Switzerland. During World War I, they built a plant in England to produce acetate dope for painting airplane wings to render them air-impervious. The success of the product led the U.S. government to invite the Dreyfus brothers to build a plant in the United States, which started commercial production in 1924. 

Sugiu K, Meguro T, Nakashiama H, Ohmoto T. Successful embolization of a spinal perimedullary arteriovenous fistula with cellulose acetate polymer solution technical case report. Neurosurgery 2001 49(5) 1257-1260. 

The major non-nylon uses of AA are in polyester polyols (for polyurethane resins, 25% of AA production), in plasticizers (7% dioctyl adipate, diisodecyl adipate, etc. for vinyl chloride, nitrocellulose and cellulose acetate polymers), resins (2% unsaturated polyesters) and 3% for miscellaneous applications, such as a food ingredient in gelatins, and as a component in cosmetics, pharmaceuticals, fertilizers, paper, cements, waxes, and so on. 

Water soluble cellulose acetate polymers and fibers are produced at DS in the range of 0.5-1 [96]. 

Kwon J-W, Yoon SH, Lee SS, Seo KW, Shim IS (2005) Preparation of silver nanoparticles in cellulose acetate polymer and the reaction chemistry of sUvct complexes in the polymer. Bull... 

MOO Moore, W.R. and Tidswell, B.M., Thermo namic properties of solutions of cellulose derivatives. 1. Dilute solutions of secondary cellulose acetate, /. Polym. Sci., 27,459,1958. 

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