Reference : Shelf Life and Controlled Cure of Epoxies by Loaded Zeolite
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/10993/12331
Shelf Life and Controlled Cure of Epoxies by Loaded Zeolite
English
Gaukler, J. Ch [Saarland University, Chair for Adhesion and Interphases in Polymers, Campus C6.3, PB 151 150,]
Müller, Ulrich mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Krüger, Jan-Kristian mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Possart, Wulff [Saarland University]
2010
Composite Interfaces
VSP International Science Publishers
0-13
Yes (verified by ORBilu)
International
0927-6440
Zeist
The Netherlands
[en] Epoxy formulations based on the multi-functional amine hardener, dicyandiamide (Dicy), regularly contain a free accelerator for reducing the curing temperature and the time needed to complete the network formation. Unfortunately, all accelerators reduce the shelf life of these adhesives at 25◦C. In order to solve this problem, accelerator-loaded zeolites fillers were developed, optimised with respect to host–guest interactions and characterised by Fraunhofer IFAM (Bremen, Germany) with regard to the release and curing behaviour in epoxy adhesive formulations. They are added to an epoxy adhesive (diglycidylether of bisphenol A (EP) and dicyandiamide (Dicy), mass ratio 100:6.7), stored at 25◦C in regular air or cured (heated with β = 10 K/min to 170◦C subsequent isothermal curing for 45 min). That shelf life and curing behaviour are investigated by FT-IR spectroscopy and modulated DSC. Compared to the EP containing free accelerator, the zeolite-filled EP possesses a threefold increase in shelf life at 25◦C due to the immobilization of the accelerator in the pores of the zeolites. While the free accelerator acts steadily during heating, it is shown that the loaded zeolite releases the accelerator at about 76◦C. Surprisingly, the released accelerator is not only involved in the chemical formation of the epoxy network but it accelerates the dissolution of Dicy considerably. As the result, network formation at 170◦C finishes after not more than 19 min and the starting temperature for curing could be reduced to 140◦C.
http://hdl.handle.net/10993/12331
10.1163/092764410X495342
Accepted to publication

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