Study of thermomechanical properties of glycidoxypropyl trimethoxy silane functionalized nanosilica/amine terminated pol
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ORIGINAL PAPER
Study of thermomechanical properties of glycidoxypropyl trimethoxy silane functionalized nanosilica/amine terminated poly (butadiene‑co‑acrylonitrile) rubber modified novolac epoxy composites for high performance applications Kavita Chauhan1 · Rajesh Kumar Tiwari1 Received: 14 April 2020 / Accepted: 3 September 2020 / Published online: 29 September 2020 © The Polymer Society, Taipei 2020
Abstract Present study investigates the effect of functionalized fumed silica (f-silica) on the thermal; mechanical and thermomechanical properties of amine terminated polybutadiene-co-acrylonitrile rubber (ATBN) modified novolac epoxy resin. All the nanocomposites showed higher thermal stability as compared to the neat novolac epoxy. Maximum –55 ˚C increment in the peak degradation temperature was achieved in the nanocomposite containing 0.1 wt. % f-silica and 10 wt. % ATBN. Glass transition temperature of the nanocomposites was reduced as compared to neat novolac epoxy resin due to incorporation of ATBN. Thermomechanical analysis showed that crosslinking density of the ATBN/novolac epoxy composite was increased as compared to neat novolac epoxy, which was further reduced in the nanocomposites due to hardener capping effect of the f-silica. All the nanocomposites showed higher elongation at break as compared to neat novolac epoxy resin. Maximum –87 and 60% increment in tensile and flexural strengths were achieved in the nanocomposite containing 2 wt % f-silica and 10 wt. % ATBN. Impact strength of the nanocomposites was increased with increasing f-silica content. Preferential conglomeration of the f-silica nanoparticles was observed in the rubber phase which acted as the efficient energy absorption point during the impact testing. Keywords Novolac epoxy nanocomposites · Amine terminated polybutadiene-co-acrylonitrile rubber · Functionalized fumed silica · Mechanical properties · Thermomechanical properties
Introduction Today is the era of polymer matrix composites (PMC) due to their limitless applications. Infinite applications of these composites made researchers to study more and more about their various properties and uses [1–10]. Among PMC, Epoxy resins are the most commonly used polymeric materials for high performance composite applications owing to their superior thermal and mechanical properties. They have found immense applications in high performance adhesives, aerospace, automobiles and other engineering purposes. However, their use in structural applications is restricted due to their inherent brittle characteristics [11–13]. To address * Kavita Chauhan [email protected] 1
Defence Materials and Stores Research and Development Establishment, Kanpur 208013, India
this issue, they are often modified by various toughening agents through diverse physical and chemical methods. The most commonly adopted method is the modification of epoxy resin with functionalized rubber having epoxycompatible functional groups. They include CTBN (carboxyl terminated poly butadiene-co-acrylonitrile rubber),
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