UV and Thermal Cure Epoxy Adhesives

Abstract

Typical commercial UV and thermal cure epoxy adhesives have been reviewed and compared. UV cure cationic epoxy adhesives are primarily composed of cycloaliphatic epoxy resin and cationic photoinitiator. UV cationic epoxy adhesives have no surface cure issue and possess low cure shrinkage and good adhesion performance but need post-thermal cure to achieve full adhesion performance in use. Hybrid UV acrylate and thermal cure epoxy adhesives are primarily composed of acrylate monomer, free radical photoinitiator, epoxy resin and curing agent. The hybrid epoxy adhesives combine fast UV curability of acrylate composition and high adhesion performance of thermal cure epoxy composition. A new type initiator free hybrid one-component UV and thermal cure adhesive has been also introduced. It is mainly composed of maleimide compound, acrylic monomer, partially acrylated epoxy resin, epoxy resin and latent curing agent. Its UV cure and thermal cure behaviour have been studied by FT-IR spectroscopy measurement.

The Mechanical Properties Relationship of Radiation-Cured Nanocomposites Based on Acrylates and Cationic Polymerized Epoxies and the Composition of Silane-Modified Tungsten Disulfide Nanoparticles

“…The properties of nanocomposites are affected by the NPs' concentration, size, shape, and, most importantly, the physio-chemical affinity to the polymer matrix. In general, the optimal concentration of the nanoparticles in the matrix is 0.3-1.0 wt.%, which has been verified through numerous studies [1,2]. Adding larger amounts of nanoparticles induces their agglomeration, which has a deleterious effect on the nanocomposite properties.…”

Application of Epoxy‐Asphalt Composite in Asphalt Paving Industry: A Review with Emphasis on Physicochemical Properties and Pavement Performances

“…According to the previous study, the curing process is generally separated into two stages, precuring at low temperature and postcuring at high temperature. It has higher degree of crosslinking and higher T g and thus better performance than those cured at room temperature [42].…”

Accelerated Photocuring of Acrylate Resins with WS2 Nanoparticles

“…Norrish Type I PIs, like bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide (BAPO), undergo direct decomposition during light irradiation. 17 The chromophore carbonyl group absorbs the photon, and the long nonbonded electron pairs of the oxygen are excited to a singlet state, thereby forming the initiator species. 18,19 Hybrid organic−inorganic nanocomposites have become the focus of interest of many research groups owing to their improved mechanical, thermal, optical, and electrical properties.…”

“…One of the well-known photochemical mechanisms is the Norrish Type I “α-” photocleavage. Norrish Type I PIs, like bis­(2,4,6-trimethylbenzoyl)-phenylphosphineoxide (BAPO), undergo direct decomposition during light irradiation . The chromophore carbonyl group absorbs the photon, and the long nonbonded electron pairs of the oxygen are excited to a singlet state, thereby forming the initiator species. , …”