Sustainable panels based on starch bioadhesives: An insight into structural and tribological performance

MONROY, YULIANA; SERÉ, PABLO; RIVERO, SANDRA; GARCÍA, MARÍA ALEJANDRA

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

ELSEVIER SCIENCE BV

Año: 2020 vol. 148 p. 898 - 907

0141-8130

This workwas focused on evaluating the effects of polycarboxylic acid addition and retrogradation phenomenonon tribological performance, thermal, and mechanical properties of both, bioadhesives and sustainable panels.The rheological behavior of adhesives was affected by retrogradation, exhibiting formulations containing CAhigher elastic modulus than those with BTCA, regardless of the acid concentration. With regard totribomechanical properties, panels formulated with CA20 and BTCA80 adhesives presented the lower friction coefficientandwear degree. Thermocompression process induced a crosslinking reaction betweenwood fibers andstarch-based adhesives, leading to more hydrophobic and thermally stable matrices in the presence of BTCA.The selection of the adhesive formulation depends on the moment of its use, since retrogradation limits its performanceand that of the derived sustainable panels, being the adhesive CA20 more appropriate in freshly preparedformulations. Meanwhile, when the storage of the adhesive prepared in batch is required, the BTCA80formulationwould be more suitable. Thus, bioinspiredmaterials can provide a valuable insight towards incorporatingstarch-based adhesives for wood applications.