Thermoplastic copolyesters properties

The effect of °Co y-ray irradiation on the mechanical properties, surface morphology, and fractography of blends of plasticized PVC and thermoplastic copolyester elastomer, Hytrel (E.I. Du Pont de Nemours Company, Inc., Wilmington, Delaware), have been studied by Thomas et al. [445]. Radiation has two major effects on the blend cross-linking of the Hytrel phase and degradation of PVC phase. Both effects are found more prominent at higher radiation dose. 

Properties M.p. 320 C Uses Thermoplastic copolyester for elec./electronics applies., lighting, telecommunications, aerospace, automotive, fiber optics, extrusion, inj. molding, connectors, bobbins, relays, motor components, sockets, imaging and sensor devices, food pkg. sports equip., fishing line, tennis rackets, high performance rope Manuf./Distrib. Idemitsu Petrochem. Mitsubishi Chem. http //www.m-kagaku. co.jp/index en.htm] N i ppon Petrochems. Polyplastics Sumitomo Chem. http //www.sumitomo-chem. co.jp... 

Thermoplastic copolyester elastomers are multiblock copolymers built up from so-called short crystallizable hard segments and long flexible segments. Owing to such chemical structure, TPEEs exhibit unusual combination of thermoplastic and elastomeric behavior. Physical and mechanical properties of these copolymers strongly depend on the chemical composition and the molecular structure... 

Keyiuords Thermoplastic copolyester elastomers, polyfether ester)s, polyfester ester)s, morphology, mechanical properties, biodegradation, TPEE blends, TPEE recycling... 

This chapter summarizes the preparation and properties of thermoplastic copolyester elastomers (TPEE), which belong to a commercially relevant and fundamentally interesting class of polymeric materials. TPEE belong to the class of thermoplastic elastomers... 

The chemical structure, chain length and content of the soft segments primarily control physical and chemical properties of thermoplastic copolyester elastomers, such as resistance to heat, light, oxygen and water, as well as low temperature properties and tear strength, but have less influence on melting temperatures, hardness and modulus. 

Polymer blending represents important route for the development of new pol)nneric materials with improved physical and processing properties and optimal cost performance. Thermoplastic copolyester elastomers are generally used as modifiers, i.e. the minor phase... 

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). 

Cai F and Isayev A I (1993), D5mamic vulcanization of thermoplastic copolyester elastomer/nitrile rubber alloys II. Rheology, morphology and properties, J Blast Blast 25 249-265. 

Optical Properties Thermoplastic Copolyesters, Eric J. Moskala, Medical Device Technology, Vol. 14, 12-lb, (2003). 

A route to compatibility involving ionomers has been described recently by Eisenberg and coworkers [250-252]. The use of ionic interactions between different polymer chains to produce new materials has gained tremendous importance. Choudhury et al. [60] reported compatibilization of NR-polyolefin blends with the use of ionomers (S-EPDM). Blending with thermoplastics and elastomers could enhance the properties of MPR. The compatibility of copolyester TPE, TPU, flexible PVC, with MPR in aU proportions, enables one to blend any combination of these plastics with MPR to cost performance balance. Myrick has reported on the effect of blending MPR with various combinations and proportions of these plastics and provided a general guideline for property enhancement [253]. 

There are two classes of polyolefin blends elastomeric polyolefin blends also called polyolefin elastomers (POE) and nonelastomeric polyolefin blends. Elastomeric polyolefin blends are a subclass of thermoplastic elastomers (TPEs). In general, TPEs are rubbery materials that are processable as thermoplastics but exhibit properties similar to those of vulcanized rubbers at usage temperatures (19). In TPEs, the rubbery components may constitute the major phase. However, TPEs include many other base resins, which are not polyolefins, such as polyurethanes, copolyamides, copolyesters, styrenics, and so on. TPEs are now the third largest synthetic elastomer in total volume produced worldwide after styrene-butadiene rubber (SBR) and butadiene mbber (BR). 

The wholly aromatic copolyester for injection molding is available in filled and unfilled grades. It can be molded into thin-wall components at high speeds. The high melt flow also enables it to be molded into heavy-wall parts. No mold release is required because of the inherent lubricity and nonstick properties. No post-curing is necessary because the material is completely thermoplastic in nature. The material is expected to have many applications because of its moldability and its resistance to high temperatures, fire, and chemicals. 

Ektar Performance Plastic s trade name for its family of copolyester thermoplastic elastomer, elastic constant See modulus of elasticity, elastic deformation See deformation, elastic en-ergy, plastic work rheology, elastic fracture See melt fracture, elastic hysteresis See hysteresis, elastic, elasticity A property that causes plastic to return to its original size and shape after removal of a force causing deformation. See coefficient of elasticity deformation and toughness extruder-web stretching and... 

---