Investigation of the interphase mechanisms and welding behaviour of fast-curing epoxy based composites with co-cured thermoplastic boundary layers

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https://irf.fhnw.ch/handle/11654/34289
Project type
Ausbildung
Project start
10.09.2018
Project end
30.01.2019
Project status
abgeschlossen
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Yes
Strategic action fields FHNW
School
Hochschule für Technik und Umwelt FHNW
Institute
Institut für Kunststofftechnik
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Subject (DDC)
620 - Ingenieurwissenschaften und Maschinenbau
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Investigation of the interphase mechanisms and welding behaviour of fast-curing epoxy based composites with co-cured thermoplastic boundary layers
(Elsevier, 12/2020) Zweifel, Lucian; Brauner, Christian
This study focuses on investigating thermoplastic polymers and their interphase behaviour with the fast-curing epoxy system Araldite LY3585/Aradur 3475. The three compatible thermoplastic polymers poly(methyl methacrylate) (PMMA), amorphous polyamide (PA12TR90), and poly(hydroxy ether) (phenoxy) were chosen to determine their affinity and interphase formation with the epoxy system. The final concept involves the use of a thermoplastic as a boundary layer on top of the epoxy to establish a connection between two joined parts by resistance welding. The thermoplastic boundary layer was generated by co-curing during the curing process. The experiments resulted in a high compatibility between phenoxy and PMMA in the selected epoxy system which leads to excellent mechanical properties after welding. Phenoxy showed the strongest joints, with an average lap shear strength of 25 MPa, demonstrating the high potential of this joining technique for industrial applications in the automotive and wind energy fields.