Crotonic acid, cellulose ester

Cozymase, I, 213 IV, 103 Cress seed mucilage, IV, 270 Crotonaldehyde, phytochemical reduction of, IV 91 Crotonbetaine, IV, 107 Crotonic acid, cellulose ester, I, 319 Crotonic acid, polymer, produced by certain bacilli, IV, 117 Crotonic acid, reduction by microorganisms, IV, 108 Crotyl alcohol, IV, 91 phytochemical reduction of, IV, 92,106 Crystalbumin. See Albumin. 

Cellulose esters of unsaturated acids, such as the acetate methacrylate, acetate maleate (34), and propionate crotonate (35), have been prepared. They are made by treating the hydrolyzed acetate or propionate with the corresponding acyl chloride in a pyridine solvent. Cellulose esters of unsaturated acids are cross-linkable by heat or uv light solvent-resistant films and coatings can be prepared from such esters. 

Amine-containing cellulose esters, eg, the acetate A/A/-diethylaminoacetate (36) and propionate morpholinobutyrate (35), are of interest because of their unique solubiHty in dilute acid. Such esters are prepared by the addition of the appropriate amine to the cellulose acrylate crotonate esters or by replacement of the chlorine on cellulose acrylate chloroacetate esters with amines. This type of ester has been suggested for use in controlled release, mmen-protected feed supplements for mminants (36,37). 

Crotonic acid esters of cellulose undergo addition reaction with cycloaliphatic amines, like morpholine or piperidine and with aliphatic primary amines. Unsaturated polymers can also undergo Diels-Alder reactions. One example is a reaction of hexachlorocyclopentadiene with polycyclopentadiene ... 

CH=CHCOOH. A white crystalline solid prepared by the oxidation of crotonaldehyde. It forms copolymers with vinyl acetate, used as hot-melt adhesives. Esters of crotonic acid are used as plasticizers for acrylic and cellulosic plastics (See image), o... 

Esters of unsaturated acids are of experimental interest because of their ability to be converted into insoluble products. Cellulose crotonate, upon heating in the presence of air, or upon exposure to ultraviolet light, becomes completely insoluble. This action may be accelerated by the addition of small quantities of benzoyl peroxide. Esters of more active unsaturated acids, such as cellulose acetate linoleate, become insoluble upon exposure to air at ordinary temperatures. ... 

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