Polyether block amide: Difference between revisions

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{{Short description|Thermoplastic elastomer}}

{{Unreferenced|date=March 2008}}

{{one source|date=July 2020}}

'''Polyether block amide''' or '''PEBA''' is a [[Elastomer|thermoplastic elastomer]] (TPE). It is also known under the tradename of PEBAX® ([[Arkema]]) and VESTAMID® E ([[Evonik Industries]]). It is a [[block copolymer]] obtained by [[polycondensation]] of a carboxylic acid [[polyamide]] ([[Nylon 6|PA6]], [[Polyamide 11|PA11]], [[polyamide 12|PA12]]) with an [[Alcohol (chemistry)|alcohol]] termination polyether ([[PTMGPolytetramethylene glycol]] PTMG), [[Polyethylene glycol|PEG]]). The general chemical structure is:

:[[Hydrogen|H]][[Oxygen|O]] - ([[Carbon|C]][[Oxygen|O]] - '''[[Polyamide|PA]]''' - [[Carbon|C]][[Oxygen|O]] - [[Oxygen|O]] - '''[[Polyether|PE]]''' - [[Oxygen|O]])_n - [[Hydrogen|H]]

PEBA is a high performance thermoplastic elastomer. It is used to replace common elastomers – thermoplastic polyurethanes, polyester elastomers, and siliconssilicones - for these characteristics: lower density among TPE, superior mechanical and dynamic properties (flexibility, [[Brittleness|impact resistance]], [[Elasticity (physics)|energy return]], [[Fatigue (material)|fatigue resistance]]) and keeping these properties at low temperature (lower than -40 °[[Celsius|C]]), and good resistance against a wide range of chemicals. It is sensitive to [[UV degradation]], however.

==Applications==

PEBA is found in the [[sports equipment]] market: for [[Damping ratio|damping]] system components and outsolesmidsoles of high end shoes (running, track & field, football, baseball, basketball, trekking, etc.) where it is appreciated for its low density, damping properties, energy return and flexibility. PEBA is also appreciated by winter sports participants as it enables design of the lightest alpine and Nordic [[ski boot]]s while providing some resistance to extreme environment (low temperatures, [[Ultraviolet|UV]] exposure, moisture). It is used in various other sports applications such as racquet grommetgrommets sandand golf balls.

PEBA is used in medical products such as [[catheter]]s for its flexibility, its good mechanical properties at low and high temperatures, and its softness.

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Some [[hydrophilic]] grades of PEBA are also used for their [[antistatic]] and antidust properties. Since no chemical additives are required to achieve these properties, products can be recycled at end of life.

==Physical Propertiesproperties==

{| class="wikitable" style="margin-left:auto; margin-right:auto;"

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|-

| Density

| g/cm³³

| 1.00 - 1.03

|-

| Water absorption at equilibrium (23  °C, 50% RH)

| %

| 0.4–0.7

|-

| Water absorption at saturation (23  °C, 24H in water)

| %

| 0.9–1.2

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|-

| Impact resistance (Charpy, notched)

| kJ/m²²

| No break

|-

| Abrasion resistance (10 N/40 m)

| mm³³

| 55–130

|-

| Surface resistivity

| Ω/sq

| 10⁹–10¹³

|-

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==References==

<references/>

{{cite book|title=Handbook of Condensation Thermoplastic Elastomers |editor-last=Fakirov |editor-first=Stoyko |last=Eustache |first=R.-P. |chapter=Poly(Ether –b-Amide) TPE: Structure, Properties and Applications |year=2005 |publisher=Wiley |doi=10.1002/3527606610.ch10}}

[[Category:Elastomers]]

[[Category:Copolymers]]

[[Category:polymersPolymers]]

[[Category:Thermoplastic elastomers]]