Abstract
The anti-aging performance of blends of polystyrene (PS), styrene–butadiene triblock copolymers (SBS), and PS/styrene–butadiene (SB)-4A (4-arm star SB block copolymer) has been studied by means of 13C NMR techniques. It is found that the anti-aging performance of these kinds of blends largely depends on their miscibility with PS of different molecular weight MPS. The larger the quantities of PS solubilized in polybutadiene (PBD) domains, the better the anti-aging performance of the blends. It is also found that the anti-aging performance of these blends has dependence on molecular architectures of the SB block copolymers. For the aged blends, the double bonds of PBD were broken, meanwhile serious cross-linking networks formed in the blends. The proposed anti-aging mechanism is that the PS solubilized in PBD domains can efficiently prevent oxygen molecules from diffusing into PBD domains, therefore, successfully stop the oxidative process of PBD.
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Feng, H., Ye, C. & Feng, Z. NMR Study on the Relationship between Miscibility and Anti-Aging Performance of Blends Containing Block Copolymers. Polym J 27, 420–428 (1995). https://doi.org/10.1295/polymj.27.420
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DOI: https://doi.org/10.1295/polymj.27.420