Frontal cationic curing of epoxy resins in the presence of defoaming or expanding compounds

Abstract

Thermal frontal polymerization was carried out with trimethylol propane triglycidyl ether using two different BF 3 -amine complexes, B-950 and B-110 from Leepoxy, as initiators for cationic polymerization. The amounts of filler (kaolin or fumed silica), defoaming, or expansion agents were varied to study how the compositions affected the front velocity, expansion, and flexural modulus of the resulting epoxy resins. The polymer produced with B-950 initiator showed higher modulus than the polymers produced with B-110. Moreover, fumed silica created stronger materials than kaolin. The presence of BYK as a defoamer or an expansion agent such as the Expancel #80 was also able to affect significantly the mechanical properties. differential scanning calorimetry studies indicated that the conversion was complete and that kaolin and silica increased the rate of reaction. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40339.

Frontal Polymerization of Deep Eutectic Solvents Composed of Acrylic and Methacrylic Acids

“…Frontal polymerization (FP) was first explored in the 1970s by Chechilo and coworkers, and its study was revitalized in the 1990s by Pojman . Since then, research on FP has expanded significantly to include cure‐on‐demand materials, synthesis of gels and gradient materials, UV initiated methacrylate and epoxide polymerizations, composite materials, and many other applications. One of the most commonly studied types of FP (and the focus of this work) is thermal free‐radical frontal polymerization of acrylic monomers.…”

Aplicación de microesferas poliméricas expandibles en la elaboración de materiales: Una revisión de la literatura

“…El rango de temperatura para su expansión, en general, se encuentra entre los 80 y 240°C (AkzoNobel, 2013;Osorio & Londoño, 2011). Cabe aclarar que existen varias referencias de Expancel ® , diferenciadas según su proceso de obtención y las condiciones óptimas de trabajo (Banea, Silva, Carbas & Campilho, 2014;Lu et al, 2016;Osorio & Londoño, 2011;Scognamillo et al, 2014). Para cada una de ellas es diferente el rango de temperatura y el diámetro final de expansión (Minerals, n.d.).…”

Successful radical induced cationic frontal polymerization of epoxy-based monomers by C–C labile compounds

“…7,8 This leads to thermally induced bulk polymerization with a moving reaction front and allows different types of filler materials. 7,8 This leads to thermally induced bulk polymerization with a moving reaction front and allows different types of filler materials.…”