1：Experimental Design and Method Selection:

The study involved extracting lignin from sugar cane bagasse using Soda pulping, preparing coatings via spin-coating on various substrates, and applying SF6 plasma and UV radiation treatments to induce cross-linking. Characterization methods included solubility tests, FTIR, SEM, EDS, XPS, AFM, swelling rate tests, and contact angle measurements.

2：Sample Selection and Data Sources:

Lignin was sourced from sugar cane bagasse. Coatings were prepared on silicon wafers, glass, paper, and AISI 1020 steel substrates.

3：List of Experimental Equipment and Materials:

Equipment included a spin-coater, plasma reactor, UV oven, Dektak II profilometer, SEM (JEOL JSM 6460-LV), AFM (WITEC Alpha 300), FTIR spectrometer (Nicolet 6700), XPS (Omicron Nanotechnology Escaplus P), goniometer (Ramé-Hart 500), TGA (Pyris 1), and various solvents. Materials included acetone, water, SF6 gas, and gold for coating.

4：Experimental Procedures and Operational Workflow:

Lignin was dispersed in acetone/water solution, spin-coated on substrates, and treated with SF6 plasma (15 and 30 min at 100 W power and 2.0 × 10^-1 mbar pressure) or UV radiation (15 and 30 min using TKL 40 W/05 lamps). Post-treatment, samples were characterized for morphology, chemistry, wettability, thermal stability, and solvent resistance.

5：0 × 10^-1 mbar pressure) or UV radiation (15 and 30 min using TKL 40 W/05 lamps). Post-treatment, samples were characterized for morphology, chemistry, wettability, thermal stability, and solvent resistance. Data Analysis Methods:

5. Data Analysis Methods: Data were analyzed using software such as Casa XPS for XPS peak fitting, and statistical averages were calculated for measurements like contact angles and swelling rates.