SPEEK (sulfonated polyether ether ketone)

SPEEK (sulfonated polyether ether ketone) is a product obtained by sulfonating polyether ether ketone (PEEK). The introduction of sulfonic acid groups into PEEK transforms SPEEK from a hydrophobic polymer into a hydrophilic electrolyte material, endowing it with the ability to conduct protons and making it an important class of proton exchange membrane materials.

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Product Details

Product Specifications

SPEEK Basic Performance Parameters

Performance Metrics	Parameter value	Test conditions
Thermal decomposition temperature (Td5%)	>300°C	TGA testing
Glass transition temperature (Tg)	170~230°C	It increases with the rise in sulfonation degree.
Heat Deflection Temperature (HDT)	160~260°C	It increases with increasing sulfonation degree.
Proton conductivity	10⁻³~10⁻¹ S/cm	Room temperature to 80°C, humidity-dependent
Water absorption rate	3–15% (weight percent)	Increases with increasing sulfonation degree.
Swelling ratio	10~50%	It increases with increasing sulfonation degree.
Ion Exchange Capacity (IEC)	0.5~2.5 meq/g	Increases with increasing sulfonation degree.
Tensile strength	30~90 MPa	It decreases as the degree of sulfonation increases.
Elongation at break	20~200%	Increases with increasing sulfonation degree.
Methanol permeability	10⁻⁸~10⁻⁶ cm²/s	Far lower than Nafion
Chemical stability	Excellent	Resistant to acids, alcohols, and hydrocarbons.
Cost	Only 1/5 to 1/10 of that of Nafion.	—

Note: The actual values of the above data may vary depending on the degree of sulfonation, molecular weight, and preparation process.

Core Features of SPEEK Membrane

Features	Explanation
Low cost	Only 1/5 to 1/10 of the thickness of a perfluorosulfonic acid membrane (such as Nafion)
Adjustable structure	By adjusting the degree of sulfonation, materials with varying properties can be obtained, and the process is highly flexible.
Good chemical resistance	It exhibits excellent resistance to acids, alcohols, hydrocarbons, oxidizing agents, and more.
Low methanol permeability	Lower than Nafion, suitable for direct methanol fuel cells (DMFCs)
High thermal stability	Thermal decomposition temperature > 300°C; can operate at 80–120°C.
Easy to modify	It can be compounded with inorganic materials, crosslinked, and surface-functionalized, among other processes.

SPEEK Membrane Performance Parameters Table

Parameter	SPEEK pure membrane	SPEEK-modified composite membrane (typical)	Test conditions
Proton conductivity	1~50 mS/cm	50~150 mS/cm	80°C, 100% RH
Ion Exchange Capacity (IEC)	1.0~2.2 meq/g	1.2~2.8 meq/g	Titrimetric method
Water absorption rate	3~15 wt%	5~20 wt%	Room temperature, 24 h
Swelling ratio	8~25%	5~18%	80°C, 24h
Tensile strength	30~80 MPa	50~100 MPa	Enhanced after modification
Elongation at break	20~150%	30~100%	—
Oxidative Stability (Weight Loss)	<5%/500h	<3%/500h	Fenton reagent test
Methanol permeability	10⁻⁸~10⁻⁷ cm²/s	10⁻⁹~10⁻⁸ cm²/s	30°C
Thermal decomposition temperature	>300°C	>280°C	TGA 5% weight loss
Selectivity	10⁴~10⁵ S·min/cm³	10⁵~10⁶ S·min/cm³	Proton conductivity/permeability