Breakup behavior of nanolayers in polymeric multilayer systems — Creation of nanosheets and nanodroplets

Jingxing Feng (1) , Ziyou Zhang (1) , Adrien Bironeau (2) , Alain Guinault (2) , Guillaume Miquelard-Garnier (2) , Cyrille Sollogoub (2) , Andrew Olah (1) , Eric Baer (1)

1 Case Western Reserve University [Cleveland]
2 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

Multilayer films comprising polystyrene (PS)/polymethyl methalcrylate (PMMA) and PS/polycaprolatone (PCL) alternating nanolayers with varied layer thickness were fabricated by multilayer coextrusion. The nanolayers breakup phenomena of PMMA and PCL were characterized using atomic force microscopy (AFM), oxygen permeability, light transmission, wide-angle X-ray scattering (WAXS), and differential scanning calorimetry (DSC). The continuous layers started to break up into nanosheets and nanodroplets during the coextrusion process when the nominal layer thickness decreased to between 30 nm and 40 nm. Further decrease of the nominal layer thickness of PMMA and PCL resulted in less nanosheets and more nanodroplets. Oxygen permeability was effective for characterizing the onset thickness of layer breakup. The oxygen permeability for the PS/PCL system was modeled and demonstrated good correlation with estimated composition of continuous layers, nanosheets, and nanodroplets.

Mots clés: Layer breakup; Polymer nanodroplets; Multilayer coextrusion

Domaines: Sciences de l'ingénieur [physics]

Jingxing Feng, Ziyou Zhang, Adrien Bironeau, Alain Guinault, Guillaume Miquelard-Garnier, et al.. Breakup behavior of nanolayers in polymeric multilayer systems — Creation of nanosheets and nanodroplets. Polymer, 2018, 143, pp.19-27. ⟨10.1016/j.polymer.2018.03.049⟩. ⟨hal-01900655⟩