2 results
Search Results
Now showing 1 - 2 of 2
- ItemPolymerizing Like Mussels Do: Toward Synthetic Mussel Foot Proteins and Resistant Glues(Weinheim : Wiley-VCH, 2018) Horsch, Justus; Wilke, Patrick; Pretzler, Matthias; Seuss, Maximilian; Melnyk, Inga; Remmler, Dario; Fery, Andreas; Rompel, Annette; Börner, Hans G.A novel strategy to generate adhesive protein analogues by enzyme-induced polymerization of peptides is reported. Peptide polymerization relies on tyrosinase oxidation of tyrosine residues to Dopaquinones, which rapidly form cysteinyldopa-moieties with free thiols from cysteine residues, thereby linking unimers and generating adhesive polymers. The resulting artificial protein analogues show strong adsorption to different surfaces, even resisting hypersaline conditions. Remarkable adhesion energies of up to 10.9 mJ m−2 are found in single adhesion events and average values are superior to those reported for mussel foot proteins that constitute the gluing interfaces.
- ItemProperties of Novel Polyesters Made from Renewable 1,4-Pentanediol(Weinheim : Wiley-VCH, 2019) Stadler, Bernhard M.; Brandt, Adrian; Kux, Alexander; Beck, Horst; de Vries, Johannes G.Novel polyester polyols were prepared in high yields from biobased 1,4-pentanediol catalyzed by non-toxic phosphoric acid without using a solvent. These oligomers are terminated with hydroxyl groups and have low residual acid content, making them suitable for use in adhesives by polyurethane formation. The thermal behavior of the polyols was studied by differential scanning calorimetry, and tensile testing was performed on the derived polyurethanes. The results were compared with those of polyurethanes obtained with fossil-based 1,4-butanediol polyester polyols. Surprisingly, it was found that a crystalline polyester was obtained when aliphatic long-chain diacids (>C12) were used as the diacid building block. The low melting point of the C12 diacid-based material allows the development of biobased shape-memory polymers with very low switching temperatures (<0 °C), an effect that has not yet been reported for a material based on a simple binary polyester. This might find application as thermosensitive adhesives in the packaging of temperature-sensitive goods such as pharmaceuticals. Furthermore, these results indicate that, although 1,4-pentanediol cannot be regarded as a direct substitute for 1,4-butanediol, its novel structure expands the toolbox of the adhesives, coatings, or sealants formulators. © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.