|Title:||Latent reactive polyurethanes based on toluenediisocyanate-uretdione and polycaprolactones|
|Authors :||Harling, Steffen|
|Published in :||International Journal of Adhesion and Adhesives|
|Publisher / Ed. Institution :||Elsevier|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Peer review (Publication)|
|Subjects :||Adhesive formulation|
|Subject (DDC) :||660: Chemical engineering|
|Abstract:||This study deals with the key raw material of many latent reactive polyurethane adhesives and describes the reaction of a crystalline isocyanate compound, toluenediisocyanate-uretdione (TDI-U), with a polyol matrix, e.g. polycaprolactone (PCL). Mixtures of these compounds (PCL:TDI-U with molar ratio 2:1) were investigated under isothermal and dynamic conditions with rheology, differential scanning calorimetry (DSC) and infrared spectroscopy (IR). Isothermal measurements at 80°C showed that the solvation of TDI-U is followed after 16min by the polyurethane formation. Isotherm storages at 40 and 60°C and the DSC analysis according to Kissinger  yield in an activation energy Ea of the reaction of the free NCO-groups of the TDI-U with the OH-groups of the PCL of about 85kJ/mol. The formed polyurethane contains uretdione rings, which are opened at temperatures higher than 150°C. The solvation process of the TDI-U seems to be an important parameter in order to control and analyse latent reactive systems and has to be investigated in further studies.|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Materials and Process Engineering (IMPE)|
|Publication type:||Article in scientific Journal|
|Appears in Collections:||Publikationen School of Engineering|
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