Abstract
Based on the thiol-ene radical addition reaction, the branched hydroxyl functionalized modified styrene-butadiene-styrene triblock copolymer (SBS-g-OH) was prepared using a commercially available SBS with high molecular weight and low content of 1,2-vinyls as substrate polymer, 2-mercaptoethanol (MCH) as modifying agent, 2,2-azodiisobutyronitrile (AIBN) as initiator, and 1,4-dioxane (DOA) as solvent. By the characterization of Fourier transform-infrared spectroscopy (FT-IR), and 1H nuclear magnetic resonance spectroscopy (1H NMR), the order of reactivity was proved that 1,2-vinyls had a priority to react with MCH at low functionalization degree of SBS-g-OH. A novel reaction kinetics model was set up to only describe the addition reaction between MCH and 1,2-vinyls, but not 1,4-units of PB segments, with this reaction kinetics model, the effect of reaction time, temperature, and initial concentration ratio of MCH to 1,2-vinyls on functionalization degree of SBS-g-OH were investigated, besides the desired o...
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