Tunable Properties of MAPLE-Deposited Thin Films in
the Presence of Suppressed Segmental Dynamics
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Version 1 2019-08-16, 18:41Version 1 2019-08-16, 18:41
Posted on 2019-09-16 - 13:37
Processing
polymer thin films by physical vapor deposition has
been a major challenge due to material degradation. This challenge
has limited our understanding of morphological control by top-down
approaches that can be crucial for many applications. Recently, matrix-assisted
pulsed laser evaporation (MAPLE) has emerged as an alternative route
to fabricate polymer thin films from near-gas phase growth conditions.
In this Letter, we investigate how this approach can result in a stable
two-phase film structure of semicrystalline polymers via a unique
combination of MAPLE and flash calorimetry. In the case of MAPLE-deposited
poly(ethylene oxide) (PEO) thin films, we find a 35 °C enhancement
in the glass transition temperature relative to melt-crystallized
films, which is associated with irreversible chain adsorption in the
amorphous region of the film. Remarkably, by varying substrate temperature
during deposition, we reveal the ability to significantly tune the
crystal orientation, extent of crystallinity, and lamellar thickness
of MAPLE-deposited PEO thin films.
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Wang, Yucheng; Gu, Kaichen; Monnier, Xavier; Jeong, Hyuncheol; Chowdhury, Mithun; Cangialosi, Daniele; et al. (2019). Tunable Properties of MAPLE-Deposited Thin Films in
the Presence of Suppressed Segmental Dynamics. ACS Publications. Collection. https://doi.org/10.1021/acsmacrolett.9b00406