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Gewählte Publikation:

Vera, M; Bischof, S; Rivas, BL; Weber, H; Mahler, AK; Kozich, M; Guebitz, GM; Nyanhongo, GS.
(2023): Biosynthesis of highly flexible lignosulfonate-starch based materials
EUR POLYM J. 2023; 198, 112392 FullText FullText_BOKU

The need to replace polymers from fossil sources with bio-based renewable sources is increasingly imminent. This work reports on the synthesis of biofilms obtained from the polymerization of lignosulfonates using laccase as a biocatalyst and blending with starch. The effect of the reaction conditions on the formation of stable starch-lignosulfonate polymers was evaluated by monitoring changes in viscosity, molecular weight (Mw), and fluo-rescence measurements. Enzymatic polymerization led to molecular weights of -400 kDa and viscosities of -1.00 Pas and decreases in lignosulfonates-OH groups by about 46% after 1 h of reaction carried out at pH 7 and adding starch at the end of the polymerization reaction. Additionally, the effect of the starch concentration on the mechanical, thermal, and water absorption properties was studied. As a result, the addition of up to 7% starch was found to improve the mechanical properties of the lignosulfonate films as indicated by the increase in elongation at break, tensile strength, and Young's modulus, reaching values of 157%, 1.19 MPa, and 0.22 MPa, respectively. This study demonstrated a green alternative for creating 100% biobased films composed of starch and lignosulfonates.
Autor*innen der BOKU Wien:
Bischof Sabrina
Gübitz Georg
Nyanhongo Gibson Stephen

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