Polymer structure of a block copolymer of poly(l‐lactic acid) (PLLA) and polystyrene (PS) is formed among a fibrous structure of PLLA inducing the gelation of PLLA in N,N‐dimethylformamide (DMF). The results of static and dynamic light scattering show the formation and growth of aggregates of the block copolymer (PLLA‐b‐PS) to form aggregates in DMF. The gels formed by the fibrous structure of PLLA in DMF are immersed in DMF solutions of PLLA‐b‐PS to allow the PLLA‐b‐PS chains to penetrate among the fibrous structure. The morphology of PLLA‐b‐PS in the gel is observed by field emission scanning electron microscopy. Viscoelastic measurements of the gel before and after the immersion indicate that the structure of the PLLA‐b‐PS elevates the flow temperature.

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