A fully bio-based wood adhesive valorising hemicellulose-rich sidestreams from the pulp industry

Abstract

Today, most wood adhesives are prepared from fossil-based polymers and contain hazardous components, e.g., formaldehyde. With the growing environmental concern there is an urge to develop biobased and harmless substitutes....

Developing High-Performance Cellulose-Based Wood Adhesive with a Cross-Linked Network

“…It is well known that the structure of substance determines its properties; thus, there is an inevitable connection between the emergence of water resistance and intricate cross-linking networks. One typical reaction that aldehyde groups of DAC and abundant primary amine groups of polyamines formed imine bond when heated, at the same time as dynamic reversibility of the imine bond led to easy conversion to a relatively stable aminal structure when it encounters another amino group, resulting in the hyperbranched network of imine and aminal co-existed, plays a crucial role in the water resistance of adhesive, and these have been discussed in previous reports. − As mentioned in structural characterization, the “amine bridge” (imine and aminal) cross-linking is consistent in polymer networks. As illustrated in Figure c, soft aliphatic chain “foot” anchored at the aldehyde group of the DAC skeleton and weaved a unique branched network between hard strands of DAC, and some intramolecular hydrogen bonds were formed by the hydroxyl group and primary amine group; this cross-linking strategy activated and modified the rigid long chain and brought in the ductile branched side chain, on the one hand, a hierarchical stress dissipation mechanism is formed, on the other hand, aliphatic chain networks contribute most of the hydrophobicity of adhesive .…”

A mussel-inspired high bio-content thermosetting polyimine polymer with excellent adhesion, flame retardancy, room-temperature self-healing and diverse recyclability

“…This result proved that the adhesive had perfect environmental stability. Compared with the adhesive strength reported in the literature, 3,16,19,21,22,[34][35][36][37][38][39][40][41][42][43][44] our polymer exhibited the best performance on all substrates (Fig. 2h).…”

Recent advances of biomass derived carbon-based materials for efficient electrochemical energy devices

“…Due to the existence of these active groups, lignin can be chemically modied through a series of chemical reactions to obtain lignin-based high valueadded materials. It can be separated and extracted from plant by organic solvent method, 33 acid method, 34 and alkaline method. 35 In addition to plants, animal manure and waste shells contain a variety of ingredients also can be used to develop useful chemicals.…”