Polybutadiene-g-polypentafluorostyrene as a coupling agent for lignin-filled rubber compounds
This study investigated the role of polybutadiene-g-polypentafluorostyrene (PB-g-PPFS) as a coupling agent between lignin and styrene butadiene rubber (SBR) in preparation of compounds with higher mechanical strength and lower viscoelastic loss. Lignins are three-dimensional amorphous polymers consisting of benzene rings carrying alkyl, alkoxy, and hydroxyl groups as substituents. These substituents render lignin electron-rich. The PPFS domains in PB-g-PPFS provide an electron-deficient pi-ring system that can couple lignin with rubber via arene-perfluoroarene interactions. PB-g-PPFS molecules were synthesized with 2:1 molar ratio of pentafluorostyrene and polybutadiene, respectively. The arene-perfluoroarene interactions were confirmed by UV-vis spectroscopy and the morphology was examined by scanning electron microscopy. The tensile strength improved by 20% and 10% for compounds of lignin and lignin-carbon black hybrid fillers, respectively. The loss tangent value reduced due to improved filler-rubber interactions promoted by PB-g-PPFS compounds. (C) 2014 Elsevier Ltd. All rights reserved.
Bahl, Kushal; Swanson, Nicole; Pugh, Colleen; and Jana, Sadhan C., "Polybutadiene-g-polypentafluorostyrene as a coupling agent for lignin-filled rubber compounds" (2014). Polymer Engineering Faculty Research. 2311.