Synthesis and characterization of bio-based UV curable polyurethane coatings from algal biomass residue

Abida Noreen, Shahid Mahmood, Azeem Khalid, Sobri Takriff, Muzammil Anjum, Luqman Riaz, Allah Ditta, Tariq Mahmood

Research output: Contribution to journalArticlepeer-review


Polyurethanes (PUs) are commonly used chemicals in various industries and are conventionally produced by the reaction of polyols and diisocyanates. However, synthetic petroleum-based polymers are non-biodegradable and resulting in issues like waste disposal, risks to aquatic and terrestrial ecosystems. In this study, a novel microalgal protein-based ultraviolet (UV) curing polyurethane acrylate (PUA) was prepared with hexanediol diacrylate (20% HDDA) precursor, amino acid oligomers, and photoinitiator (Irgacure 184). Experimental conditions for the synthesis of precursors were studied and their chemical structures were confirmed by FT-IR, (HNMR)-H-1, (CNMR)-C-13, and differential scanning calorimetry (DSC). The absorption peak at 1695 cm(-1) confirmed the formation of a urethane bond. For instance, the obtained polyurethane acrylate coating (PUA) possessed a glass transition temperature (T-g) of 122 celcius, tensile strength, modulus of 19.1 MPa, 465 MPa, and lower elongation break (6%). While using reactive diluents, the coating compositions showed significant enhancement of mechanical, physical, and chemical resistance properties. In general, this work offered a simple bio-scheme of reactions to prepare a sustainable microalgal-based PU coating that could be applied in the coating industry with improved properties.
Original languageEnglish
Number of pages17
JournalBiomass Conversion and Biorefinery
Publication statusE-pub ahead of print - 13 Aug 2022


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