Thermoplastic copolyester ethers

Slonecki J (1992) The effect of mass fraction and molecular weight of segments on the conditions of preparation, structure and properties of thermoplastic copolyester-ethers (KPEE). Part 111. The effect of mass fraction and molecular weight of segments on some mechanical properties of KPEE, Polimery 37 19-24 (in Polish). 

Thermoplastic copolyester elastomers are generally block copolymers produced from short-chain aUphatic diols, aromatic diacids, and polyalkjlene ether-diols. They are often called polyesterether or polyester elastomers. The most significant commercial product is the copolymer from butane-l,4-diol, dimethyl terephthalate, and polytetramethylene ether glycol [25190-06-1J, which produces a segmented block copolyesterether with the following stmcture. 

The segmented block copoly(ether ester)s, based on poly(butylene terephthalate) (PBT) and on polyoxytetramethylene (POTM) are typical examples for this class of thermoplastic elastomers . They can be described as random copolyesters of tereph-thalic acid with 1,4-butanediol and a-hydro-hard phase whereas the remaining ester segments mix with the ether segments and build up the soft matrix. 

It must be appreciated that both standard and non-standard abbreviations are used. Often materials appear, and become used, before the standards committee has issued its suggestion. By this time a non standard abbreviation has become established or more than one abbreviation may appear for the same material. The thermoplastic elastomer, known as polyether ester elastomer, may be referred to as PEEL or, as COPE (from copolyester) or, as TEEE (thermoplastic elastomer ether ester) or, as YBPO (an American suggestion). 

---