Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 11 4 2018 11 01 Epoxy Coatings Physically Cured with Hydroxyl-contained Silica Nanospheres and Halloysite nanotubes 199 207 76672 10.30509/pccc.2018.76672 EN M. Jouyandeh Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box: 81746-73441, Isfahan, Iran. O. Moini Jazani Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box: 81746-73441, Isfahan, Iran. A.H. Navarchian Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box: 81746-73441, Isfahan, Iran. M.R. Saeb Department of Resin and Additives, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran. Journal Article 2018 07 18 Epoxy coatings are usually reinforced by the use of nanofillers, but reactive nanofillers having physical tendency towards epoxide ring opening are preferable. In this work, nanosilica (SiO<sub>2</sub>) and halloysite nanotubes (HNTs) known for their hydroxyl-contained surface are used and their effects on the curing behavior of an epoxy/amine coating is compared. The spherical and tubular nanoparticles used in epoxy led to somewhat different crosslinking. Epoxy/amine systems containing equivalent amount of silica spherical and halloysite nanotube particles were compared for their cure characteristics, i.e. temperatures of starting and ending of curing reaction (T<sub>ONSET</sub> and T<sub>ENDSET</sub>), the exothermal peak temperature (T<sub>p</sub>), the temperature range among which curing reaction was completed (∆T= T<sub>ENDSET</sub> - T<sub>ONSET</sub>) and the total heat of curing reaction (∆H). Fourier-transform infrared spectrophotometry and scanning electron microscopy analyses were used to assess formation of SiO<sub>2</sub>. Nonisothermal differential scanning calorimetry was performed at different heating rates and cure characteristics together with values of glass transition temperature of two kinds of systems containing SiO<sub>2</sub> and HNTs were calculated, where both nanofillers revealed accelerating role in epoxy curing reaction. Epoxy Coatings Halloysite Nanotube Silica Nanoparticle Cure behavior https://pccc.icrc.ac.ir/article_76672_6e0b6668889394d04aba93b66174d98c.pdf