Dataset for chemorheological and rheokinetic analysis of carbohydrate-HMF-amine adhesives

The work consists of primary and analysed data from rheological measurements of carbohydrate-hydroxymethylfurfural-amine adhesives. The studied adhesives are a bio-based alternative to conventional wood adhesives. The rheological properties were studied at different temperatures in isothermal (80, 90, 95 °C) and non-isothermal (20–120 °C) oscillatory measurements. Non-isothermal rheological measurements were used for the determination of the activation energy based on Vyazovskin's isoconversional method. The viscosity profile of the adhesives, determined from isothermal measurements, was fitted by an empirical model. The viscosity kinetic constant can be obtained from this empirical model and used in further rheokinetic analysis.

Data from density and swelling experiments was measured for the characterization of the adhesive network. The determined polymer-solvent interaction parameter is included in the collected data.

The provided datasets were used in the investigation of the reactivity and curing reaction of the studied adhesives. A discussion and interpretation of the data can be found in the previous publication  Catherine Thoma, Pia Solt-Rindler, Wilfried Sailer-Kronlachner, Thomas Rosenau, Antje Potthast, Johannes Konnerth, Alessandro Pellis, Hendrikus W.G. van Herwijnen, Carbohydrate-hydroxymethylfurfural-amine adhesives: Chemorheological analysis and rheokinetic study, Polymer, Volume 231, 2021,
124128, ISSN 0032-3861, https://doi.org/10.1016/j.polymer.2021.124128.
(https://www.sciencedirect.com/science/article/pii/S0032386121007515).  Abstract: Carbohydrates as a component in adhesive formulations have been reported for many years. A rapid cure at moderate temperatures is a remaining challenge in the development of renewable adhesives. Rheology provides insight into all stages of structure formation of a cured polymer. This work analyses the curing of carbohydrate-amine adhesives with and without the addition of 5-hydroxymethylfurfural (HMF) as a biomass-derived key reactant in adhesives. Isothermal and non-isothermal rheological measurements were performed to characterize i) the rheology of the prepolymer, ii) the initial stages of curing, iii) the sol-gel transition, and iv) general rheokinetics. The viscosity profile was described by empirical models and showed a deviation from homogeneous curing. Rheokinetic analysis using isoconversional methods and Arrhenius plots showed that HMF reduces the activation energy of the curing reaction. The addition of 5 mol.-% HMF (based on starting fructose content) increases the reactivity by lowering the activation energy of the curing.
Keywords: Hydroxymethylfurfural; Curing; Rheology; Rheokinetics carbohydrates; Adhesives