The image shows a typical example of the novel type of polyurethane-based hotmelts developed by Daniëel Turkenburg and colleagues. They contain thermo-reversible bonds that help to improve the key-properties of a hotmelt by enhancing the flow properties at high temperature while increasing the strength of adhesion at room temperature. The (retro-) Diels Alder reaction between furan and maleimide groups has been found very effective in establishing the desired thermo-reversible behavior for these materials resulting in unusually strong adhesion. The bond formed with the hotmelt of optimized composition was even found too strong for quantification with the laboratory's elcometer. (DOI: 10.1002/app.44972)
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