This PDF file includes:

• fig. S1. Synthesis of QP monomer.
  
• fig. S2. NMR assignment of 3,3″-dibromo-para-terphenyl.
  
• fig. S3. NMR assignment of QP monomer.
  
• fig. S4. ¹H NMR assignment of SPP-QP (titrated IEC = 2.4 mmol g⁻¹) copolymer.
  
• fig. S5. Morphology of SPP-QP (titrated IEC = 2.4 mmol g⁻¹) membrane.
  
• fig. S6. SAXS profile.
  
• fig. S7. Number of absorbed water molecules per sulfonic acid group (λ).
  
• fig. S8. Stress versus strain curves.
  
• fig. S9. Chemical structure of the SPP-bl-1 copolymer.
  
• fig. S10. Hydrogen and oxygen permeability.
  
• fig. S11. Membrane durability and flexibility.
  
• fig. S12. The effect of the OCV hold test on the molecular structure of the SPPQP
  membrane (IEC = 2.6 mmol g⁻¹).
  
• Mathematica Notebook

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