RT Journal Article
T1 Impact of the processing method on the properties of castor oil/cellulose acetate polyurethane adhesives for bonding wood
A1 Tenorio Alfonso, Adrián
A1 Sánchez Carrillo, María Carmen
A1 Franco Gómez, José María
AB During the last decades, the replacement of the traditionally petro-based raw materials by eco-friendly substances in polyurethane production has become a great challenge. The synthesis of polyurethanes is mainly conducted by means of a selective reaction between active isocyanate and hydroxyl groups, yielding a characteristic segmented chemical structure. In this study, the traditional solvent-based polycondensation reaction for the synthesis of bio-based polyurethane adhesives, involving first cellulose acetate modification with 1,6-hexamethylene diisocyanate and subsequent crosslinking with castor oil, was evaluated and compared with a simpler solvent-free single-step protocol. The impact of the preparation procedure and reagent proportions, on the chemical structure, thermo-rheological behaviour and ultimate adhesion performance were evaluated. The rheological response and adhesion performance of these bio-inspired polyurethanes were also compared to those found in some commercial adhesives. This research highlights the reinforcing and stabilizing effect of cellulose acetate on bio-polyurethane performance. Particularly, the inclusion of cellulose acetate into the adhesive manufacture allowed a reduction in the maximum curing time under room conditions to almost one week, while yielding a higher thermal stability and a fourfold increase in elastic modulus in comparison to the cellulose acetate-free counterpart. Moreover, the proposed solvent-free synthetic route enhanced the microphase mixing of the ensuing bio-based polyurethanes, exhibiting an adhesion performance comparable to the considered commercial benchmarks, but with failure occurring primarily within the substrate material – the preferred locus of failure. 
PB Elsevier
YR 2022
FD 2022
LK http://hdl.handle.net/10272/20807
UL http://hdl.handle.net/10272/20807
LA eng
NO Tenorio-Alfonso, A., Sánchez, M. C., & Franco, J. M. (2022). Impact of the processing method on the properties of castor oil/cellulose acetate polyurethane adhesives for bonding wood. In International Journal of Adhesion and Adhesives (Vol. 116, p. 103153). Elsevier BV. https://doi.org/10.1016/j.ijadhadh.2022.103153
NO Funding: This work is part of two research projects (CTQ2014–56038-C3-1R and TEP-1499) sponsored by MINECO-FEDER and Junta de Andalucía programmes, respectively. One of the authors (Adrián Tenorio-Alfonso) has also received a PhD. Research Grant from “Ministerio de Educación” (FPU13/01114). Funding for open access charge was provided by Universidad de Huelva / CBUA. The authors gratefully acknowledge the financial support.
DS Repositorio Institucional de la Universidad de Huelva
RD 14 jul 2026