This work presents the preparation of nanomaterials thanks to the assembly of a triblock copolymer P(Sty(319)-co-AN(262))-b-PEO795-b-P(Sty(319)-co-AN(262)). The 3D construction is directed by the assembly of block copolymer micelles prepared in situ during the spin-coating of the block copolymer solution. With a solvent system DMF/toluene 50/50, spherical micelles are formed and assembled into a nanoparticle film. The micelle size in the dry state is 50 nm. With a solvent system DMF/toluene 25/75, worm-like micelles (50 nm in diameter) are formed in situ together with "Y-cylinders" and lead to what we called "spider web" Films. Micelles are strongly interacting through a dynamic association process between "bridge" and "loop" conformations of the ABA triblock copolymer. When micelles come into contact, some bridges are formed with the two A blocks localized in the heart of two different micelles. The resulting materials show good mechanical properties and enable the preparation of self-standing polymer films.