Centro de Investigación y Desarrollo en Criotecnología de Alimentos, CIDCA-CONICET-CICPBA, 47 y 116, La Plata, Argentina.
Centro de Investigación y Desarrollo en Tecnología de Pinturas, CIDEPINT-CONICET-CICPBA, Av.52 e/121 y 122, La Plata, Argentina.
Int J Biol Macromol. 2020 Apr 1;148:898-907. doi: 10.1016/j.ijbiomac.2020.01.205. Epub 2020 Jan 22.
This work was focused on evaluating the effects of polycarboxylic acid addition and retrogradation phenomenon on tribological performance, thermal, and mechanical properties of both, bioadhesives and sustainable panels. The rheological behavior of adhesives was affected by retrogradation, exhibiting formulations containing CA higher elastic modulus than those with BTCA, regardless of the acid concentration. With regard to tribomechanical properties, panels formulated with CA20 and BTCA80 adhesives presented the lower friction coefficient and wear degree. Thermocompression process induced a crosslinking reaction between wood fibers and starch-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 performance and that of the derived sustainable panels, being the adhesive CA20 more appropriate in freshly prepared formulations. Meanwhile, when the storage of the adhesive prepared in batch is required, the BTCA80 formulation would be more suitable. Thus, bioinspired materials can provide a valuable insight towards incorporating starch-based adhesives for wood applications.
这项工作主要集中在评估多元羧酸的添加和回生现象对生物胶粘剂和可持续板材的摩擦性能、热性能和机械性能的影响。胶粘剂的流变性能受到回生的影响，表现为含有 CA 的配方的弹性模量高于含有 BTCA 的配方，而与酸的浓度无关。关于摩擦力学性能，用 CA20 和 BTCA80 胶粘剂制成的板材具有较低的摩擦系数和磨损程度。热压工艺在木材纤维和淀粉基胶粘剂之间引发了交联反应，在 BTCA 的存在下导致更疏水和更热稳定的基质。胶粘剂配方的选择取决于其使用的时刻，因为回生会限制其性能和由此产生的可持续板材的性能，CA20 胶粘剂在新制备的配方中更为合适。同时，当需要批量制备的胶粘剂的储存时，BTCA80 配方更为合适。因此，仿生材料可以为在木材应用中加入淀粉基胶粘剂提供有价值的见解。
