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SEBS is a triblock copolymer of styrene, ethylene-butylene and styrene in which glassy polystyrene end blocks anchor a rubbery midblock [1]. The midblock is a hydrogenated polybutadiene segment, so the chain carries no double bonds and resists oxidation and ultraviolet exposure better than the unsaturated parent [1]. The polystyrene domains act as physical crosslinks that hold the network at room temperature and soften above the glass transition of polystyrene, so the material is thermoplastic and reprocessable [2]. The styrene-to-rubber ratio fixes modulus and melt viscosity, while the midblock length sets elasticity [1]. Because the junctions are physical, the polymer dissolves in non-polar solvents without breaking covalent bonds [3].
- triblock copolymer
- styrene-ethylene-butylene-styrene
- thermoplastic elastomer
- physical crosslink
- hydrogenated midblock
References
- Denac, M.; Šmit, I.; Musil, V.; Polypropylene/talc/SEBS (SEBS-g-MA) composites. Part 1. Structure. Composites Part A: Applied Science and Manufacturing 2005, 36, 1094-1101, 10.1016/j.compositesa.2005.01.022.
- Sharma, R.; Maiti, S.N.; Melt rheological properties of PBT/SEBS and reactively compatibilized PBT/SEBS/SEBS‐g‐MA polymer blends. Journal of Applied Polymer Science 2015, 132, app.41402, 10.1002/app.41402.
- Shen, J.; Huang, J.; Wen, Y.; Roth, S.; A comprehensive review on SEBS gel as a synthetic human tissue surrogate. Journal of the Mechanical Behavior of Biomedical Materials 2026, 180, 107351, 10.1016/j.jmbbm.2026.107351.
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