Sodium formaldehyde sulfoxylate

Monomers, glycidyl methacrylate (GMA), methyl methacrylate (MMA), allyl methacrylate (ALMA) from Merck Chemical Co., and butyl acrylate (BA) from Fluka were purchased and used as received. Emulsogen APS 100 from Clariant, ter-butyl perbenzoate (TBPB) from Merck Chemical Co., sodium formaldehyde sulfoxylate (SFS), ethylene diamine tertaacetic acid (EDTA), iron (II) sulfate heptahydrate (FeSO₄. 7H₂O), and ammonium persulphate (APS) from Aldrich, were used without any further purification. MWCNTs with the purity of > 95%, length of 5–15 µm, and outer diameter of 10–20 nm was purchased from Nutrino (Tehran, Iran). The epoxy resin was standard diglycidylether of bisphenol A (DGEBA) (Epon828 from HEXION) with an epoxy equivalent molecular weight between 185 g/eq and 192 g/eq. The curing agent was cycloaliphatic polyamine hardener (Epicure F205 from HEXION) with hydroxyl equivalent weight of 102–106 g/eq. Deionized water (DIW) was used in all recipes.

For the polymerization of ESBR and RAFT ESBR, styrene (99.5%) was purchased from SAMCHUN Chemicals, Korea, and 1,3-butadiene, a surfactant (fatty soap, rosin soap), micelle stabilizer (KOH), and p-methane hydroperoxide (as an initiator) were supplied by Kumho Petrochemical Co. Ltd. (KKPC, Seoul, Korea) and then used without further purification. Tert-Dodecyl mercaptan (TDDM) as a chain transfer agent, S,S-dibenzyl trithiocarbonate (DBTC) (97%) as a RAFT agent, sodium hydrosulfite (SHS) as a reducing agent, sodium formaldehyde sulfoxylate (SFS, 86%) as a catalyst, ferrous sulfate (FES, 99%), ethylenediaminetetraacetic acid (EDTA, 99%), and diethylhydroxylamine (DEHA, 98%) as a shortstop agent, were purchased from Merck, Kenilworth, NJ, USA. As a coagulant, NaCl and H₂SO₄ (1 mol/L) were purchased from Daejung, Korea.