Polyftetramethylene terephthalate

PTT is made by the melt polycondensation of PDO with either terephthalic acid or dimethyl terephthalate. The chemical structure is shown in Figure 11.1. It is also called 3GT in the polyester industry, with G and T standing for glycol and terephdialate, respectively. The number preceding G stands for the number of methylene units in the glycol moiety. In the literature, polyfpropylene terephthalate) (PPT) is also frequently encountered however, this nomenclature does not distinguish whether the glycol moiety is made from a branched 1,2-propanediol or a linear 1,3-propanediol. Another abbreviation sometimes used in the literature is PTMT, which could be confused with polyftetramethylene terephthalate). 

The peculiar behaviour of polyftetramethylene terephthalate) 4GT has received considerable attention with studies on multiple melting and crystallization behaviour, - the alpha crystal phase, the hysteresis of the stress-induced crystalline phase transition, and reversible crystal deformation and conformational changes. ... 

Fakirov, S. and T. Gogeva, Poly(Ether/Ester)s based on polyftetramethylene terephthalate) and polyfethylene glycol), 3. Effect of thermal treatment and drawing on the structure of the poly(ether/ester)s. Die Makromolekulare Chemie, 191(10) p. 2341.1990. 

Tenite PTMT Eastman Chemical Polyftetramethylene terephthalate)... 

Nagata, M., et al. Biodegradability of polyfethylene terephthalate) copolymers with polyfethylene glycoDs and polyftetramethylene glycol). Polymer... 

---