Ethylene-vinyl alcohol (EVOH) copolymer is commonly combined in the food packaging industry with polyolefins because it offers very good barrier properties to gas and organic solvents. These properties come from the crystalline phase (degree of crystallinity and morphology) depending on copolymer composition and crystallization conditions [1]. It is well known that confining a polymer at the nanoscale modifies crystallization habit, possibly leading to a great variety of crystalline morphologies exhibiting unique preferential orientations [2]. The aim of this study is to investigate EVOH bulk crystallization phenomenon and its modification when confining the polymer in nanoscale space. After having investigated the bulk crystallization of EVOH, two techniques have been used to confine the polymer: the classical spin coating [3] and the forced-assembly coextrusion [4]. Both techniques can induce spatial confinement in a different way. In the first technique, the film is spin-coated on a substrate, while in the second, EVOH is coextruded with another polymer chosen to impose hard confinement. Different techniques (AFM, X-ray diffraction) have been used to characterize the crystalline morphology in the bulk and lamellas orientation in thin layers. The effect of the layer thickness, the crystallization temperature, and the interface has been investigated. Acknowledgment This research was supported by FUI NOXY II project. References [1] A. Alvarez, K. Kenny, et V. Vazquez, « Isothermal Crystallization of Poly(vinyl alcohol–co–ethylene) », J. Appl. Polym. Sci., vol. 89, 2003. [2] R. E. Prud’homme, « Crystallization and morphology of ultrathin films of homopolymers and polymer blends », Prog. Polym. Sci., vol. 54 55, p. 214 231, mars 2016. [3] O. K. Muratoǧlu, A. S. Argon, et R. E. Cohen, « Crystalline morphology of polyamide-6 near planar surfaces », Polymer, vol. 36, no 11, p. 2143 2152, janv. 1995. [4] J. M. Carr, D. S. Langhe, M. T. Ponting, A. Hiltner, et E. Baer, « Confined crystallization in polymer nanolayered films: A review », J. Mater. Res., vol. 27, no 10, p. 1326 1350, mai 2012.