Investigation of the mechanical and thermal properties of reactive AAEM-co-MMA adhesive
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Investigation of the mechanical and thermal properties of reactive AAEM‑co‑MMA adhesive F. Fotoohi1 · A. Salimi1 · H. Bouhendi1 · K. Kabiri1 Received: 10 July 2019 / Revised: 14 October 2019 / Accepted: 2 December 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract The effect of acetoacetoxyethyl methacrylate (AAEM) comonomer was investigated on the adhesion and thermal and mechanical properties of methyl methacrylate (MMA) reactive adhesive. The free radical bulk copolymerization of AAEM-coMMA at ambient temperature was carried out in the presence of redox couple of benzoyl peroxide (BPO) and N,N-dimethylaniline (DMA). The glass transition temperature (Tg) and Young’s modulus of different AAEM comonomer compositions were investigated by dynamic mechanical thermal analysis (DMTA) and three-point bending test. The presence of AAEM comonomer resulted in a low Tg and high modulus adhesive. The results from tensile test and lap shear strength showed the usefulness of AAEM in MMA adhesive with an optimum AAEM contribution of 20 wt.%. The improvements in adhesive main properties and thermal stability may be well attributed to the formation of cross-linking bonds which is in agreement with the results of FTIR spectroscopy. Keywords Methyl methacrylate · Acetoacetoxyethyl methacrylate · Adhesive · Mechanical properties · Thermal properties
Introduction In competition with the well-known epoxy and polyurethane adhesives, the reactive acrylic adhesives may be well addressed as effective structural adhesives in a wide range of applications. The adhesive is composed of two main parts: the resin (vinyl monomers or elastomeric polymers) and a common initiator system such as peroxides [1, 2]. The main characteristics of the reactive adhesives include the high shear strength, fast curing at ambient temperature, and ability to bond to a variety of substrates such as plastics, composites, and metals [1, 3]. Since the introduction of
* H. Bouhendi [email protected] 1
Iran Polymer and Petrochemical Institute (IPPI), Box: 14975‑112, Tehran, Iran
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MMA-based adhesive, several modifications were made on adhesives mainly focusing on the improvement in adhesion, toughness, and thermal properties [1]. PMMA as an amorphous polymer has shown high tensile strength and modulus with superior optical properties. However, it suffers from low resistance to crack propagation [4–6], so PMMA samples will be broken before reaching yield stress [1, 7]. Several methods have been proposed to overcome this problem, such as adding hydroxyl-terminated liquid polybutadiene (HTPB) or using grafted natural rubber (GNR) [8, 9] or even in situ MMA copolymerization with proper monomers such as 2-ethylhexyl acrylate, N-hexyl acrylate, butyl acrylate, and ethylene vinyl acetate [10–12]. There have been some reports about using alumina nanoparticles [13] resulting in superior improvement in PMMA adhesive main properties such as shear strength, peel strength, glass transition temperature,
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