**Appendix A**

Castor oil from Carl Roth (Karlsruhe, Germany), 1,5-pentamethylene diisocyanate (PDI) from Covestro (Leverkusen, Germany), 4,4-diaminodiphenylmethane (a) (MDA), 1,5-pentamethylene diamine (c) (PDA), stearyl amine from TCI (Zwijndrecht, Belgium) and 2,5-Bis(aminomethyl)furan (BAMF) from Carbosynth (Compton, UK) were used to produce the greases (Figures A1 and A2).

**Figure A1.** 1H-NMR spectrum of the PDI-PDA thickener.

**Figure A2.** 1H-NMR spectrum of the PDI-MDA thickener.





**Table A3.** Thermal stability of the bio-based greases.

