Araldite mt 35700

Bisphenol F and aniline-based benzoxazine (BF-a) (Araldite MT 35700) from Huntsman Advanced Materials GmbH (Basel, Switzerland) was used. Carbon (twill 2/2, 200 g/m²) and glass (twill 2/2, 390 g/m²) were obtained from MC Technics (Visé, Belgium). Basalt fabric (atlas, 350 g/m²) was supplied by Basaltex (Wevelgem, Belgium). For the glass and basalt fibers, the sizing was organosilane-based, whereas the carbon fibers exhibited an epoxy-based sizing. The carbon fibers exhibited a smaller diameter of 7 µm and a lower density of 1.76 g/cm³, compared to glass (9 µm and 2.54 g/cm³) and basalt (13 µm and 2.67 g/cm³) fibers.

Bisphenol-F and aniline-based benzoxazine Araldite MT35700^® (BF-a) was obtained from Huntsman Corporation (Basel, Switzerland), and 4,4′-methylenedianiline (MDA) from Fluka (Buchs, Switzerland). p-Aminophenol, p-benzoquinone, ethanol, 2-ethoxyethanol, methanol, tetrahydrofuran and vanillin were supplied from Sigma Aldrich (Taufkirchen, Germany). 4-hydroxybenzaldehyde was from ABCR (Karlsruhe, Germany), and DOPO was from TCI (Zwijndrecht, Belgium). All chemicals were used without further purification.

The following components were used for the preparation of epoxyacrylate copolymers (EAC): n-butyl acrylate (BA); glycidyl methacrylate (GMA); 4-hydroxybutyl acrylate (HBA) (BASF, Ludwigshafen, Germany); 4-acryloyloxy benzophenone (ABP, Chemitec, Scandiccy, Italy); 2,2-azobis(isobutyronitryle) (AIBN, Merc, Darmstadt, Germany); and ethyl acetate (POCh, Gliwice, Poland) as a solvent. The commercial benzoxazine resins Araldite MT 35910 and Araldite MT 35700 (Huntsman, Everberg, Belgium), latent curing agents (IL-0003-HP, Ionic Liquids Technologies GmbH, Heilibronn, Germany; and Nacure Super A233, Worleé Chemie, Hamburg, Germany), a multifunctional monomer (Laromer 9023, BASF, Germany), a radical photoinitiator (Omirad 127, IGM Resins, Waalwijk, The Netherlands), and a surface-tension-reducing compound to improve wettability of the substrates (Byk 325, Byk-Chemie, Wesel, Germany) were used as components of the self-adhesive structural tapes (SATs). The chemical structures and characteristics of benzoxazine resins (BRs) and latent curing agents (LCAs) are showed in Table 1 and Figure 1, respectively.