Heat bonding of wood with starch-lignin mixtures creates new recycling opportunities

Engineered wood products are a meaningful approach to overcome some limitations inherent wood, such as inhomogeneity and dimensional constraints. Wood adhesives play key role in this concept; however, their bonding chemistry hitherto impedes facile separation of the components at end service life engineered products. Besides lacking recyclability, environmental safety sustainability further issues that could be improved. Herein, we present an inexpensive bio-adhesive system pave way towards novel generation sustainable Following four-stage experimental design assess impact various process parameters, it has been shown aqueous mixtures equal quantities corn starch sodium lignosulfonate (BIOMIX) feature excellent bond characteristics when subjected hot pressing (150°C, 0.2 MPa, 60 s), comparable with commercial urea-formaldehyde (UF) adhesives. Activation beforehand by gelatinization is not required granule opening, chain disentanglement plasticization occur during confirmed polarized light microscopy differential scanning calorimetry (DSC). The presence essential due its water retarding, dispersing plasticizing abilities. Preliminary recyclability tests beech veneer assemblies glued BIOMIX revealed hydrolysis glueline (60 min) subsequent re-bonding without addition new adhesive reaches almost initial shear strength values investigated using automated evaluation (ABES).