Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins

Abstract

Polyurethanes (PUs) are an important class of polymers due to their low density and thermal conductivity combined with their interesting mechanical properties—they are extensively used as thermal and sound insulators, as well as structural and comfort materials. Despite the broad range of applications, the production of PUs is still highly petroleum-dependent. The use of carbohydrates in PU synthesis has not yet been studied extensively, even though, as multihydroxyl compounds, they can easily serve as crosslinkers in PU synthesis. Partially or potentially biobased di-, tri- or poly-isocyanates can further be used to increase the renewable content of PUs. In our research, PU films could be easily produced using two bio-based isocyanates—ethyl ester L-lysine diisocyanate (LLDI] and ethyl ester l-lysine triisocyanate (LLTI)—, one commercial isocyanate—isophorone diisocyanate (IPDI), and a bio-based white dextrin (AVEDEX W80) as a crosslinker. The thermal and mechanical properties are evaluated and compared as well as the stability against solvents.

Polyurethane Coatings Based on Renewable White Dextrins and Isocyanate Trimers

“…We have recently reported the PU synthesis using isophorone diisocyanate (IPDI) and two bio‐based isocyanates—ethyl ester L‐lysine diisocyanate (LLDI) and ethyl ester l‐lysine triisocyanate (LLTI). The reaction conditions were optimized in terms of casting time and temperature, diisocyanate used, amount of solvent, excess of diisocyanate . Our previous experiments resulted in PU films with limited stability and scratch resistance.…”

Enzymatic transesterification of urethane-bond containing ester

“…Due to the increasing awareness of sustainability research, biobased routes for polyurethane synthesis are becoming more interesting in recent years. To develop more sustainable alternatives for the synthesis of polyurethanes, several different pathways have been worked on for phosgene-and isocyanate-free and biobased polyurethane synthesis in the past [3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Green Synthesis of Glycopolymers Using an Enzymatic Approach

“…The group of Reimund Stadler was working extensively on glyco‐hybrid structures such as carbohydrate/polysaccharide modified polysiloxane brush systems, polystyrene rod‐coil systems, and modified surfaces . This work was extended in recent years to continue the efforts of the Stadler group …”