Title: Latent reactive polyurethanes based on toluenediisocyanate-uretdione and polycaprolactones
Authors : Harling, Steffen
Meola, Giuseppe
Schaible, Stefan
Schulthess, Adrian
Brändli, Christof
Meincke, Olaf
Published in : International Journal of Adhesion and Adhesives
Volume(Issue) : 46
Pages : 26
Pages to: 33
Publisher / Ed. Institution : Elsevier
Issue Date: 2013
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
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 [1] 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
DOI : 10.1016/j.ijadhadh.2013.05.012
ISSN: 0143-7496
1879-0127
URI: https://digitalcollection.zhaw.ch/handle/11475/8734
Appears in Collections:Publikationen School of Engineering

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