Polytrimethylene terephthalate

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Polytrimethylene terephthalate
Strukturfromel PPT.svg
Names
Other names
Poly(trimethylene terephthalate); Poly(oxy-1,3-propanediyloxycarbonyl-1,4-phenylenecarbonyl)
Identifiers
  • 26590-75-0
ChemSpider
  • none
Properties
(C11H10O4)n
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Polytrimethylene terephthalate (PTT), is a polyester synthesized and patented in 1941.[1][2] It is produced by a method called condensation polymerization or transesterification. The two monomer units used in producing this polymer are: 1,3-propanediol and terephthalic acid or dimethyl terephthalate. Similar to polyethylene terephthalate, the PTT is used to make carpet fibers.

PTT's value as a commercial polymer has improved due to more economical and efficient methods to produce 1,3-propanediol in the 1980s by Degussa, via acrolein, and Shell via the hydroformylation of ethylene oxide.[3] DuPont has successfully commercialized the production of this polymer via 1,3-propanediol obtained by fermentation. These developments may allow PTT to effectively compete against PBT and PET, two polyesters that have been far more successful than PTT to date.

Production[]

Similar to the ubiquitous poly(ethylene terephthalate), this polymer is prepared by the esterification of 1,3-propanediol (HO(CH2)3OH) with terephthalic acid (C6H4(COOH)2), or by transesterification of dimethyl terephthalate:[3]

Reaction scheme of PTT-synthesis …
Polykondensation PTT.svg
 … by esterification.
Umesterung PTT V1.svg
 … by transesterification.

This polymer has been commercialized as Sorona by DuPont.

Applications[]

On Friday, March 20, 2009, the Federal Trade Commission approved a subclass to polyester called triexta.[4] The PTT fiber used in Mohawk's SmartStrand carpet, and branded Sorona by Dupont can be labeled triexta. Triexta has several advantages over polyester, including better stain resistance and softness.[5]

The FTC had last approved an extension for residential carpet in 1959. Mohawk Industries and DuPont applied jointly for FTC approval of the triexta polyester subclass in 2006; it was approved three years later.

References[]

  1. ^ John Rex Whinfield and James Tennant Dickson (1941) "Improvements Relating to the Manufacture of Highly Polymeric Substances", UK Patent 578,079; "Polymeric Linear Terephthalic Esters", U.S. Patent 2,465,319 Publication date: March 22, 1949; Filing date: September 24, 1945; Priority date: July 29, 1941
  2. ^ Max M. Houck; et al. (July 2001). "Poly(Trimethylene Terephthalate): A "New" Type of Polyester Fiber". Forensic Science Communications. 3 (3). Archived from the original on November 11, 2005.
  3. ^ a b Helmut Sattler; Michael Schweizer. "Fibers, 5. Polyester Fibers". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.o10_o01.
  4. ^ "FTC Approves Federal Register Notice Establishing New Fiber Name and Definition" (Press release). Federal Trade Commission. 2009-03-20.
  5. ^ Simmons, Cheryl (8 August 2019). "Triexta PTT Carpet Fiber". The Spruce.

External links[]

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