Developments in Thermoplastic Elastomers by K.E. Kear

By K.E. Kear

Thermoplastic elastomers (TPEs) have the elastic behaviour of rubber and the processability of thermoplastics. The chemistry, homes and processing of those fabrics are mentioned during this assessment. professional grades are being brought for particular functions and with detailed houses, akin to softness or processability. The assessment is observed through round four hundred abstracts from the Rapra Polymer Library database.

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242-9 German APPLIED TESTING OF TPES Vennemann N Osnabruck,University The assessment of the possibilities and limits of TPEs is carried out based on characteristic quantities which are determined according to the standardised rubber test methods. These test methods are oriented towards the unique behaviour of common rubber materials, but may not be fully suited to detect the different behaviour of TPEs. The subject of this work is the presentation of new test methods that can contribute to a better characterisation of TPEs.

C. Boyce and K. Shaw, inventors; Advanced Elastomer Systems LP, assignee; US Patent 6,579,944B1, 2003. 15 M. Soliman, M. van Es and M. , 1998, 79, 86. 16 W. Narhi and S. Mehta, Application of timetemperature superposition to stress relaxation in elastomers, Proceedings of ANTEC 2003, Society of Plastics Engineers, 2003. M. E. W. Bednarik, Proceedings of TPE TOPCON 1995, Society of Plastics Engineers, 1995, 186. D. Snyder, inventor; US Patent 2,623,031, 1952. E. Kear, Proceedings of TPE TOPCON 1997, Society of Plastics Engineers, 1997, 190.

This Newtonian behaviour allows the TPE melt to flow and deform easily at low shear rate. It is a good characteristic for injection moulding especially when combined with an overall low viscosity behaviour. The rheological behaviour for several TPEs is compared in Figure 12. The TPEs have differing flow behaviour. The SEBS shown is for an injection moulding grade which has a much lower overall viscosity which makes it flow better when filling an injection mould. 18) (Reproduced with permission from the Society of Plastics Engineers) tendency to approach Newtonian behaviour at low shear rates.

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