Thermoplastic elastomers properties

ABA triblock copolymers of the styrene-diene type are well known, and owe their unique properties to their heterophase morphology. This arises from the incompatibility between the polystyrene A blocks and the polydiene B blocks, leading to the formation of a dispersion of very small polystyrene domains within the polydiene matrix. This type of elastic network, held together by the polystyrene "junctions", results in thermoplastic elastomer properties. 

Report 81 Thermoplastic Elastomers - Properties and Applications, J.A. Brydson. 

TiCl4 concentration, and blocking time. The star blocks exhibit an excellent combination of thermoplastic elastomer properties. The products exhibited excellent strengths and elongations (up to 27 MPa and 500%), in spite of the presence of 10-15% contaminants. They are potential easily processiable TPEs. 

BRYDSON, j. A., Thermoplastic Elastomers - Properties and Applications, RAPRA Review Report 81 (Vol. 7, no. 9) 1995... 

J.A. Brydson, Thermoplastic Elastomers Properties and Applications, Rapra Review Report No.81, Volume 7, No.9, Rapra Technology, Shrewsbury, UK,... 

Polystyrene (S) was grafted on the butyl backbone by converting the ally lie chloride sites to initiating carbonium ions (R AlR Cl ). The product has thermoplastic elastomer properties. Most recently Kennedy and coworkers have developed techniques for grafting... 

The properties of the linear material 7.27 and the network copolymer 7.28 have been studied by dynamic mechanical analysis, DSC, and transmission electron microscopy. Evidence was obtained for the formation of highly ordered micro-phase-separated superstructures in the solid state from the materials 7.27. The Cu(bipy)2 moieties appear to form ordered stacks, and this leads to thermoplastic elastomer properties. In contrast, the network structure of 7.28 prevents significant microphase separation [51-53]. By means of related approaches, dinuclear Cu helical complexes have also been used to create block copolymers by functioning as cores [54], and polymer networks have also been formed by using diiron(II) triple helicates as cores for the formation of copolymers with methyl methacrylate [55]. 

These block copolymers exhibited both good thermomechanical properties and low surface tension and some of them exhibited also thermoplastic elastomers properties. 

Classification Thermoplastic elastomer Properties Dens. 1.15-1.22 kg/l m.p. 165-210 C tens. str. 40-50 MPa elong. break 500-850% good elastic, abrasion, and solv. resist. 

Brady, G. S., ed. 2002. Materials Handbook An Encyclopedia for Managers, Technical Professionals, Purchasing and Production Managers, Technicians, and Supervisors, 15th ed. New York McGraw-HiU. This classic handbook covers essential information for over 15,000 materials. In the latest edition dozens of material families have been updated extensively, including adhesives, activated carbon, fullerenes, heat-transfer fluids, nanophase materials, nickel alloys, olefins, silicon nitride, stainless steels, and thermoplastic elastomers. Property information is embedded in the encyclopedic entry. Available online through various services. 

Thermoplastic Elastomer Properties. Thermoplastic elastomers (TPEs) (5) are multiphase polymers. They behave like elastomers over a wide temperature range. However, unlike the cross-linked rubbers, they can be melt processed after raising the temperature sufficiently. They are used in many applications. They may be semicrystalline or amorphous ... 

Morphological effects in polymer blends and in block copolymers consisting of partially or completely immiscible components were discussed at a sufficient level of detail earlier in this article. See the paragraphs titled Polymer Blend Properties and Thermoplastic Elastomer Properties in thfe section titled... 

Some aspects of semicrystalline polymers were also discussed earlier in this article. See the paragraphs titled Tensile and Shear Properties, Semicrystalline Polymer Processing, Semicrystalline Pol3rmer Properties, and Thermoplastic Elastomer Properties in the section titled Practical Importance and Common Methods for Measurement. Crystallinity will, however, be discussed below in further detail because of the complexity of the interplay between the amorphous and crystalline phases and the role of this interplay in the processing and end use performance of a vast variety of industrially important polymers. 

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