science

Polytrimethylene terephthalate

Polytrimethylene terephthalate is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Polytrimethylene terephthalate rather than just read about it. In short: Polytrimethylene terephthalate (PTT), is a polyester synthesized and patented in 1941. It is produced by a method called condensation polymerization or transesterification.

Key takeaways

Polytrimethylene terephthalate belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Polytrimethylene terephthalate to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Polytrimethylene terephthalate from memory before moving on to harder problems.

Reference excerpt

Polytrimethylene terephthalate (PTT), is a polyester synthesized and patented in 1941. 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. 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:

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. The PTT fiber used in Mohawk's SmartStrand carpet, and branded Sorona by Dupont can be labeled triexta. Triexta has been reported to have several advantages over polyethylene terephthalate, including better stain resistance and softness. 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

External links Forensic Science Communications literature review of Polytrimethylene terephthalate

Illustrations

Worked examples

Example 1 — a first encounter with Polytrimethylene terephthalate

Start with the simplest possible case. Write down what Polytrimethylene terephthalate claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Polytrimethylene terephthalate before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Polytrimethylene terephthalate ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Polytrimethylene terephthalate

In research: Polytrimethylene terephthalate appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Polytrimethylene terephthalate in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Polytrimethylene terephthalate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Plastics, Polyesters, Terephthalate esters, so understanding it makes those chapters shorter.
In everyday life: Look for Polytrimethylene terephthalate outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Polytrimethylene terephthalate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Polytrimethylene terephthalate means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Polytrimethylene terephthalate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Polytrimethylene terephthalate in simple terms?

Polytrimethylene terephthalate (PTT), is a polyester synthesized and patented in 1941. It is produced by a method called condensation polymerization or transesterification.

Why does Polytrimethylene terephthalate matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Polytrimethylene terephthalate?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Polytrimethylene terephthalate.