Bio‐based polyurethane films using white dextrins

Abstract

Several new eco-friendly materials have the potential to replace conventional petroleum-derived materials and monomers. Among them are natural polysaccharides. The use of polysaccharides in polyurethane (PU) synthesis has not yet been studied extensively, even though as multihydroxyl compounds, they can easily serve as crosslinkers in PU synthesis. One naturally occurring (hyper-) branched polymer is amylopectin, a component of starch. In this work, we report the PU synthesis and film-forming capacity using the asymmetric cyclic aliphatic diisocyanate-isophorone diisocyanate (IPDI) with acetylated and pristine partially hydrolyzed amylopectin/ white dextrin (AVEDEX W80) as a crosslinker.

Polyurethane Coatings Based on Renewable White Dextrins and Isocyanate Trimers

“…All the samples started to crack at some point during the film casting. This behavior was not only observed with HDI t as isocyanate, but also with other cyanates as reported by us earlier …”

“…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.…”

“…Another important property of the polyurethane films is their thickness. Starting with the same concentration of polyol/DMSO as in our previous work using IPDI, the results are analyzed and the concentration is adjusted. The starting concentration in the case of IPDI was 122 g AVEDEX W80/L DMSO, which accounted with HDI t as isocyanate in a film thickness of 0.78 mm.…”

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 …”