Dibutyltin dilaurate 95

To obtain a bio-based polyol, PEG 400 (polyethylene glycol) supplied by POCH S.A. (Gliwice, Poland) and refined crude glycerol acquired from Bio-Chem sp. z.o.o. (Olszanka, Poland) were used as a liquefaction solvent. The hydroxyl number of bio-based polyol was 475 mg KOH/g and the water content was 0.27%. A concentrated 95% aqueous solution of sulfuric (VI) acid was purchased from Avantor Performance Materials Poland S.A. (Gliwice, Poland) and used as a catalyst. Shredded cellulose (50 μm diameter powder) was obtained from POCH S.A. (Gliwice, Poland). Polyether polyol Rokopol^® M6000 (LOH = 28 mg KOH/g) was supplied by PCC Rokita S.A. (Brzeg Dolny, Poland). The polymeric methylene diphenyl diisocyanate (pMDI) was provided by Borsodchem (Kazincbarcika, Hungary). The content of free isocyanate groups in pMDI was 31%. Dibutyltin dilaurate 95% and Dabco^® 33-LV were purchased from Sigma-Aldrich (Saint Louis, MO, USA). Glass fiber of 6 mm was purchased from KROSGLASS S.A. (Krosno, Poland) and 6 mm of carbon fiber was purchased from Surfpol (Nowy Kurzeszyn, Poland).

Substrates to obtain bio-based polyol PEG 400 (polyethylene glycol) were supplied by POCH S.A (Gliwice, Poland) and refined crude glycerol was acquired from Bio-Chem sp. z o.o. (Olszanka, Poland). As a catalyst, 95% aqueous solution of sulfuric (VI) acid was purchased from Avantor Performance Materials Poland S.A (Gliwice, Poland). Shredded cellulose was obtained from POCH S.A (Gliwice, Poland). Polyether polyol Rokopol^® M6000 (L_OH = 28 mg KOH/g) was supplied by PCC Rokita S.A (Brzeg Dolny, Poland). The polymeric methylene diphenyl diisocyanate (pMDI) was supplied by Borsodchem (Kazincbarcika, Hungary). The content of free isocyanate groups in pMDI was 31.5%. Dibutyltin dilaurate 95% was obtained from Sigma-Aldrich (Saint Louis, MO, USA). Glass fiber of 10 mm was purchased from KROSGLASS S.A (Krosno, Poland), and sisal fiber was obtained from Canella S.A (New York, NY, USA).