Abstract
Adhesives and sealants (AS) are materials with excellent properties, versatility, and simple curing mechanisms, being widely used in different areas ranging from the construction to the medical sectors. Due to the fast-growing demand for petroleum-based products and the consequent negative environmental impact, there is an increasing need to develop novel and more sustainable sources to obtain raw materials (monomers). This reality is particularly relevant for AS industries, which are generally dependent on non-sustainable fossil raw materials. In this respect, biopolymers, such as cellulose, starch, lignin, or proteins, emerge as important alternatives. Nevertheless, substantial improvements and developments are still required in order to simplify the synthetic routes, as well as to improve the biopolymer stability and performance of these new bio-based AS formulations. This environmentally friendly strategy will hopefully lead to the future partial or even total replacement of non-renewable petroleum-based feedstock. In this brief overview, the general features of typical AS are reviewed and critically discussed regarding their drawbacks and advantages. Moreover, the challenges faced by novel and more ecological alternatives, in particular lignocellulose-based solutions, are highlighted.
Highlights
In the construction area different types of adhesives and sealants (AS) are used, such as polyurethane (PU), epoxies (EP), polyamides (PA), ethylene-vinyl acetate-copolymers (EVA), poly(vinyl acetate)s (PVAc), silicones, etc
Silicones have a major role on the adhesives and sealants market due to their superior physicochemical and mechanical properties and simple curing mechanisms
The poor biodegradability and recent scarce availability of silicone-based materials has been triggering the development of novel bio-based alternatives. This brief overview clearly demonstrates the opportunities introduced by renewable resources, such as cellulose, lignin, starch, vegetable oils, or proteins, in the formation of novel bio-based materials to substitute traditional adhesives and sealants with reduced human and environmental toxicity, competitive performance, and improved biodegradability
Summary
In the construction area different types of adhesives and sealants (AS) are used, such as polyurethane (PU), epoxies (EP), polyamides (PA), ethylene-vinyl acetate-copolymers (EVA), poly(vinyl acetate)s (PVAc), silicones, etc. The demand for products manufactured from renewable and sustainable sources, such as biopolymers, has significantly increased, resulting in renewable and sustainable sources, such as biopolymers, has significantly increased, resulting in remarkable scientific and industrial advances [16,17]. These advances can lead to a decrease of remarkable scientific and industrial advances [16,17].
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