The present invention easily controls the surface energy of a coated substrate using a polymer nanomosaic (PNM) coating layer formed by interfacial self-assembly (ISA) of a block copolymer. It is possible to provide a block copolymer film including a vertically oriented block copolymer nanoregion. According to the above manufacturing method, not only has excellent process economy, but also can be applied to various substrates without limitation on the size, shape and type of the substrate, and self-assembled with a desired orientation and pattern density by simply controlling the water surface area of the interfacial self-assembly Block copolymer films can be prepared.
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