- Cellulose triacetate
Cellulose triacetate, also known simply as triacetate, is manufactured from
celluloseand acetate. Triacetate is typically used for the creation of fibresand film base.It is similar chemically to cellulose acetate, with the distinguishing characteristics being that in triacetate, according to the Federal Trade Commissiondefinition, at least "92 percent of the hydroxylgroups are acetylated." During the manufacture of triacetate the cellulose is completely acetylated whereas in regular cellulose acetate or cellulose diacetate, it is only partially acetylated. Triacetate is significantly more heat resistantthan cellulose acetate.
Triacetate, whose chemical equation is [C6H7O2(OOCCH3)3] n, was first produced commercially in the
U.S.in 1954 by Celanese Corporation[http://www.celanese.com] . Mitsubishi Rayon Co., Ltd. is the only company that still produces the fiber. Eastman Kodakformerly manufactured cellulose triacetate. They discontinued this product on March 15, 2007.
Triacetate is derived from cellulose by combining cellulose with acetate from
acetic acidand acetic anhydride. The cellulose acetate is dissolved in a mixture of dichloromethaneand methanolfor spinning. As the filaments emerge from a spinneret, the solventis evaporated in warm air, in a process known as dry spinning, leaving a fibre of almost pure triacetate.
A finishing process called "S-Finishing" or surface
saponificationis sometimes applied to acetate and triacetate fabrics using a sodium hydroxidesolution. This removes part or all of the acetyl groups from the surface of the fibres leaving them with a cellulose coating. This reduces the tendency for the fibres to acquire a static charge.
As a Fibre
Triacetate fibres have a
crenate[http://dictionary.reference.com/search?q=crenate] cross section.
*Generally washable at high temperatures
*Maintains creases and pleats well
Particularly effective in clothing where crease or pleat retention is important, such as skirts and dresses.
In the 1980s triacetate was also used with
polyesterto create shiny tracksuits which were very popular at the time. The material was very smooth and shiny on the outside and soft and fleecy on the inside.
General Care Tips
*Ironable up to 200 °C
*Pleated garments are best hand laundered. Most other garments containing 100% triacetate can be machine washed and dried
*Articles containing triacetate fibres require very little special care due mainly to the fibre's resistance to high temperatures
As a film
grease, oil, aromatic hydrocarbons, and most common solvents
*Films have hard
laminated, coated, folded, and die-cut
Cellulose acetate filmprone to degradation known as Vinegar syndrome
* [http://www.fibersource.com/f-tutor/triacetate.htm www.fibersource.com description of triacetate fibre]
* [http://www.islandgroup.com/TriacetateFilm.html www.islandgroup.com description of triacetate film]
* [http://www.ftc.gov/os/statutes/textile/rr-textl.htm Federal Trade Commission definition of triacetate]
* [http://www.bodley.ox.ac.uk/dept/preservation/information/photographic/messier/messier.htm Article on the long term archival of triacetate photographic films]
* [http://www.celaneseacetate.com/textile_glossary_filament_acetate.pdf Glossary of terms relation to the manufacture of cellulose / acetate fibres]
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