Carbohydrate-hydroxymethylfurfural-amine adhesives: Chemorheological analysis and rheokinetic study

POLYMER

卷:231

Article

Thoma, Catherine^1,3  Solt-Rindler, Pia¹  Sailer-Kronlachner, Wilfried^1,3  Rosenau, Thomas²  Potthast, Antje²  Konnerth, Johannes³  Pellis, Alessandro⁴  van Herwijnen, Hendrikus W. G.¹ 

[1] Kompetenzzentrum Holz GmbH, Wood K Plus Competence Ctr Wood Composites & Wood, Altenberger Str 69, A-4040 Linz, Austria

[2] BOKU Univ Nat Resources & Life Sci Vienna, Dept Chem, Inst Chem Renewable Resources, Muthgasse 18, A-1190 Vienna, Austria

[3] BOKU Univ Nat Resources & Life Sci Vienna, Dept Mat Sci & Proc Engn, Inst Wood Technol & Renewable Mat, Konrad Lorenz Str 24, A-3430 Tulln, Austria

[4] BOKU Univ Nat Resources & Life Sci Vienna, Inst Environm Biotechnol, Dept Agrobiotechnol IFA Tulln, Konrad Lorenz Str 20, A-3430 Tulln, Austria

关键词: Hydroxymethylfurfural;    Curing;    Rheology;    Rheokinetics carbohydrates;    Adhesives;   

DOI  :  10.1016/j.polymer.2021.124128

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free