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Cellulose triacetate

February 15, 2024

Cellulose triacetate, triacetate, CTA or TAC is a chemical compound produced from cellulose and a source of acetate esters, typically acetic anhydride. Triacetate is commonly used for the creation of fibres and film base. It is chemically similar to cellulose acetate. Its distinguishing characteristic is that in triacetate, at least "92 percent of the hydroxyl groups are acetylated."[1] During the manufacture of triacetate, the cellulose is completely acetylated; whereas in normal cellulose acetate or cellulose diacetate, it is only partially acetylated. Triacetate is significantly more heat resistant than cellulose acetate.

Cellulose triacetate
Names
Other names
2,3,6-Tri-O-acetyl cellulose; cellulose triacetate polymer; triacetylcellulose
Identifiers
  • 9012-09-3 Y
ChemSpider
  • none
ECHA InfoCard 100.115.198
  • DTXSID30892177
Properties
variable
Molar mass variable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)

History edit

Triacetate, whose chemical formula is [C6H7O2(OOCCH3)3]n, was first produced commercially in the U.S. in 1954 by Celanese Corporation. Eastman Kodak was a manufacturer of CTA until March 15, 2007. For almost 3 years, Mitsubishi Rayon Co. Ltd. was the only manufacturer. In 2010, Eastman Chemical announced a 70% increase in cellulose triacetate output at its Kingsport, Tennessee manufacturing site to meet the increasing demand for the chemical's use as an intermediate in the production of polarized films for liquid crystal displays.[2][3]

Production edit

Triacetate is derived from cellulose by acetylating cellulose with acetic acid and/or acetic anhydride. Acetylation converts hydroxyl groups in cellulose to acetyl groups, which renders the cellulose polymer much more soluble in organic solvents. The cellulose acetate is dissolved in a mixture of dichloromethane and methanol for spinning. As the filaments emerge from a spinneret, the solvent is 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 saponification is sometimes applied to acetate and triacetate fabrics using a sodium hydroxide solution. 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.

Applications edit

As a fibre edit

Triacetate fibres have a crenate cross section.

Characteristics edit

  • Shrink resistant
  • Wrinkle resistant
  • Easily washable
  • Often washable at high temperatures
  • Maintains creases and pleats well

Usage scenarios edit

Triacetate is particularly effective in clothing where crease or pleat retention is important, such as skirts and dresses.

In the 1980s triacetate was also used with polyester to create shiny tracksuits. The fabric was smooth and shiny on the outside and soft and fleecy on the inside.

General care tips edit

  • 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 little special care due mainly to the fibre's stability at high temperatures

As a film edit

Main article: Safety film

Characteristics edit

Usage scenarios edit

As a semipermeable membrane edit

Usage scenarios edit

See also edit

References edit

  1. ^ Federal Trade Commission definition
  2. ^ "Eastman increasing cellulose triacetate capacity". timesnews.net. Associated Press. November 3, 2010.
  3. ^ Lindsey Bewley (November 1, 2010). "Eastman to Boost Cellulose Triacetate Capacity at Kingsport". IHS Chemical Week.

External links edit

  • Federal Trade Commission definition of triacetate
  • Glossary of terms relation to the manufacture of cellulose / acetate fibres 2005-03-06 at the Wayback Machine

February 15, 2024
cellulose, triacetate, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, sept. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Cellulose triacetate news newspapers books scholar JSTOR September 2017 Learn how and when to remove this template message Cellulose triacetate triacetate CTA or TAC is a chemical compound produced from cellulose and a source of acetate esters typically acetic anhydride Triacetate is commonly used for the creation of fibres and film base It is chemically similar to cellulose acetate Its distinguishing characteristic is that in triacetate at least 92 percent of the hydroxyl groups are acetylated 1 During the manufacture of triacetate the cellulose is completely acetylated whereas in normal cellulose acetate or cellulose diacetate it is only partially acetylated Triacetate is significantly more heat resistant than cellulose acetate Cellulose triacetate NamesOther names 2 3 6 Tri O acetyl cellulose cellulose triacetate polymer triacetylcelluloseIdentifiersCAS Number 9012 09 3 YChemSpider noneECHA InfoCard 100 115 198CompTox Dashboard EPA DTXSID30892177PropertiesChemical formula variableMolar mass variableExcept where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa N verify what is Y N Infobox references Contents 1 History 2 Production 3 Applications 3 1 As a fibre 3 1 1 Characteristics 3 1 2 Usage scenarios 3 1 3 General care tips 3 2 As a film 3 2 1 Characteristics 3 2 2 Usage scenarios 3 3 As a semipermeable membrane 3 3 1 Usage scenarios 4 See also 5 References 6 External linksHistory editTriacetate whose chemical formula is C6H7O2 OOCCH3 3 n was first produced commercially in the U S in 1954 by Celanese Corporation Eastman Kodak was a manufacturer of CTA until March 15 2007 For almost 3 years Mitsubishi Rayon Co Ltd was the only manufacturer In 2010 Eastman Chemical announced a 70 increase in cellulose triacetate output at its Kingsport Tennessee manufacturing site to meet the increasing demand for the chemical s use as an intermediate in the production of polarized films for liquid crystal displays 2 3 Production editTriacetate is derived from cellulose by acetylating cellulose with acetic acid and or acetic anhydride Acetylation converts hydroxyl groups in cellulose to acetyl groups which renders the cellulose polymer much more soluble in organic solvents The cellulose acetate is dissolved in a mixture of dichloromethane and methanol for spinning As the filaments emerge from a spinneret the solvent is 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 saponification is sometimes applied to acetate and triacetate fabrics using a sodium hydroxide solution 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 Applications editAs a fibre edit Triacetate fibres have a crenate cross section Characteristics edit Shrink resistant Wrinkle resistant Easily washable Often washable at high temperatures Maintains creases and pleats wellUsage scenarios edit Triacetate is particularly effective in clothing where crease or pleat retention is important such as skirts and dresses In the 1980s triacetate was also used with polyester to create shiny tracksuits The fabric was smooth and shiny on the outside and soft and fleecy on the inside General care tips edit 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 little special care due mainly to the fibre s stability at high temperaturesAs a film edit Main article Safety film Characteristics edit Resistant to grease oil aromatic hydrocarbons and most common solvents Films have hard glossy surfaces Excellent optical clarity High dielectric constant Easily laminated coated folded and die cut Cellulose acetate film prone to degradation known as vinegar syndromeUsage scenarios edit Polarizer films for LCD projectors Specialized overhead projector transparencies Specialized photographic film Motion picture film Production of animation cels Packaging Face screensAs a semipermeable membrane edit Usage scenarios edit Water purification through reverse osmosis The membrane may consist of a blend of cellulose acetate diacetate and triacetate See also editCellulose acetate Vinegar syndrome RayonReferences edit Federal Trade Commission definition Eastman increasing cellulose triacetate capacity timesnews net Associated Press November 3 2010 Lindsey Bewley November 1 2010 Eastman to Boost Cellulose Triacetate Capacity at Kingsport IHS Chemical Week External links editDescription of triacetate fibre Description of triacetate film Federal Trade Commission definition of triacetate The long term archival of triacetate photographic films Glossary of terms relation to the manufacture of cellulose acetate fibres Archived 2005 03 06 at the Wayback Machine Fundamentals of membranes for water treatment Retrieved from https en wikipedia org w index php title Cellulose triacetate amp oldid 1186258314, wikipedia, wiki, book, books, library,

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