A segmented block copolymer is synthesized using dihydroxy terminated polystyrene (PSt) (M-W=2,500 g/mol) and crystallizable amide segments. PSt length in the copolymer is varied from 2,500 to 10,000 g/mol using dimethylterephthalate (T). Amide segment is synthesized in situ using diamine-diamide 6X6 (X=A or T) (synthesized by dimethylterepthalate [T], adipic acid [A], and hexamethylenediamine [6]) and T. This work is to modify the high T-g amorphous PSt to a semicrystalline copolymers (-(PSt-T)(y)-6X6-T-)-(n)). These copolymers have a very high inherent viscosity and depending on the amide concentration, the melting temperature of the polymers was ranged between 129 degrees C and 248 degrees C. The crystallinity of the amide segments is up to 75%. The AFM analysis showed the presence of crystalline ribbons with a high aspect ratio. All the polymers show single stage decomposition temperature centered around 420 degrees C. The solvent resistivity of these materials is very high even at a low concentration of (5 wt%) amide content. POLYM. ENG. SCI., 58:361-368, 2018. (c) 2017 Society of Plastics Engineers