Syndiotactic polystyrene (sPS) and polyamide-6 (PA6) are recognized as immiscible and incompatible polymers．In this study

sulfonated syndiotactic polystyrene (SsPS-H) was used as compatibilizer in the blend of sPS/PA6．During melt blending

SsPS-H and PA6 can be well mixed because of the strong interpolymer interactions between the sulfonate groups and the amide groups including the interaction due to the transfer of the sulfonic acid protons to the nitrogens of the amides．In addition

SsPS-H is miscible with sPS when the degree of sulfonation is low. Therefore

the addition of SsPS-H to sPS／PA6 blends reduces the size of the dispersed phase and improves the adhesion between the phases. The glass transition temperatures of the PA6 component in the compatibilized blends shift progressively towards higher temperature with increasing the content of SsPS-H

indicating enhanced compatibility．On the other hand

the progressive lowering of the melting point and crystallization temperatures of PA6 in the blends with increasing SsPS-H contents provides some insight into the level of interaction between PA6 and SsPS-H．The compatibilized blends have significantly higher impact strength than the blends without SsPS-H．The best improvement in the impact strength of the blends was achieved at an SsPS-H (8.65 mol％) content of about 5 wt％.