Controlled Natural Biomass Deoxygenation Allows the Design of Reusable Hot-Melt Adhesives Acting in a Multiple Oxygen Binding Mode

Abstract

The present article describes a conceptual view on the design of reusable bioderived high-value-added materials. The translation of a highly complex irregular structure of natural biopolymer into a well-defined hierarchically organized molecular chain led to the discovery of unique adhesive properties enhanced by a novel multiple binding effect. For practical applications, biomass-derived furanic polyesters were found as reusable thermoplastic adhesives. Examined poly(ethylene-2,5-furandicarboxylate) (PEF) and poly(hexamethylene-2,5-furandicarboxylate) (PHF) showed strong adhesion to aluminum in single-lap shear tests (1.47 ± 0.1 and 1.18 ± 0.1 kN/cm 2 , respectively). After the separation, the joints could be easily restored by reheating of the metal parts. Three consecutive cycles of regluing were successfully performed without a significant drop in the adhesive strength. Strong adhesion of the biomass-derived polymers to glass surfaces was also observed (0.93 ± 0.11 kN/cm 2 for PEF and 0.84 ± 0.06 kN/cm 2 for PHF). An in-depth study of the surfaces after the shear tests, carried out by means of scanning electron microscopy, revealed predominantly cohesive failure in the case of aluminum samples and adhesive failure in the case of glass samples. Computational modeling revealed a multiple oxygen binding mode for the interaction of furanic polyester molecules with the glass surface and metal atoms. Only sustainable materials were used as a carbon source for the production of target polymers, which showed excellent compatibility with the practically most demanding constructing materials (a universal reusable hot-melt adhesive for copper, brass, Be-copper, Mn-bronze, zinc, aluminum, titanium, and glass).

Biobased C6-Furans in Organic Synthesis and Industry: Cycloaddition Chemistry as a Key Approach to Aromatic Building Blocks

“…In the first step of the overall sequence to benzene derivatives (Figure A), the biobased approach involves the conversion of cellulose biomass into C 6 -furanic platform chemicals, such as 5-(hydroxymethyl)­furfural (5-HMF), furan-2,5-dicarboxylic acid (FDCA), 2,5-diformylfuran (DFF), and 5-(chloromethyl)­furfural (CMF). This step has been thoroughly studied and is currently a well-developed process with a number of different catalytic systems available from research to industrial scales. − Sometimes furanic compounds can serve as suitable aromatic units for incorporation into materials (e.g., furan-2,5-dicarboxylic acid vs terephthalic acid in the synthesis of polyesters) − or biologically active compounds. − However, in the majority of cases, it is the benzene ring that should be present in the structure of the compound of interest. Indeed, transformation of furanic compounds into benzene derivatives is a cornerstone of sustainable synthesis of functionalized aromatics …”

Integration of thermal imaging and neural networks for mechanical strength analysis and fracture prediction in 3D-printed plastic parts

“…There are two main factors that affect the properties of the resulting material: composition (including changes in the bulk material and combining multiple materials together) and structure. Additive manufacturing—a set of technologies of layer-by-layer 3D-object printing—affects both factors 2 , 3 , provides unique possibilities for printing complex objects 4 , and shows high sustainability 5 and opening recycling opportunities 6 , 7 .…”

Biomass-Derived Ionic Liquids Based on a 5-HMF Platform Chemical: Synthesis, Characterization, Biological Activity, and Tunable Interactions at the Molecular Level

“…The development of green and sustainable processes for replacing fossil-fuel-based materials for important classes of chemicals with sustainable and renewable biomass products is one of the rapidly advancing directions of modern chemistry. − Conversion of biomass into fine chemicals, fuels, and commodity materials has been recognized as means to maintain the carbon-neutral balance, to reduce the emissions of CO 2 and to foster a better environment and society for new generations. − …”