Polyether block amide: Difference between revisions

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{{Short description|Thermoplastic elastomer}}

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

{{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:

HO:[[Hydrogen|H]][[Oxygen|O]] - (CO[[Carbon|C]][[Oxygen|O]] - '''[[Polyamide|PA]]''' - CO[[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 amateurparticipants as it enables design of the lightest alpine and nordicNordic [[ski bootsboot]]s while providing some resistance to extreme environment (low temperatures, [[Ultraviolet|UV]] exposure, moisture). It is used in various other sports applications such as 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.

It is also widely used in the '''manufacture of electric &and electronic''' marketgoods forsuch as cables and wireswire coatings, electronic devicesdevice casings, components, etc.

'''Textiles'''PEBA can be madeused fromto PEBA:make [[textiles]] as well as breathable film, fresh feeling fibres or [[Nonwovens|non -woven]] fabrics.

Some [[hydrophilic]] grades of PEBA are also used for their '''[[antistatic''']] and '''antidust''' properties. TheySince enable, contrary tono chemical additives, toare obtainrequired anto immediateachieve andthese permanentproperties, effect and toproducts recyclecan thebe productrecycled at end of life.

==Physical Propertiesproperties==

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

{{entête tableau charte}}

|-

! Properties

! Unit

! Value

|-----

| Melting Point

| °C

| 134–174

|-

|-{{ligne grise}}

| Density

| g/cm³³

| 1.00 - 1.03

|-----

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

| %

| 0.4–0.7

|-

|-{{ligne grise}}

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

| %

| 0.9–1.2

|-----

| Shore Hardness

| Shore D

| 25–72

|-

|-{{ligne grise}}

| Flexural modulus

| MPa

| 12–513

|-----

| Tensile strength at break

| MPa

| 32-56

|-

|-{{ligne grise}}

| Elongation at break

| %

| 300–750

|-----

| Impact resistance (Charpy, notched)

| kJ/m²²

| No break

|-

|-{{ligne grise}}

| Abrasion resistance (10 N/40 m)

| mm³³

| 55–130

|-----

| Surface resistivity

| Ω/sq

| 10⁹–10¹³

|-

|-{{ligne grise}}

| Volume resistivity

| Ω·cm

| 10⁹–10¹³

|}

==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]]