1 research outputs found
Molecular Dynamics of Swollen Poly(2-vinylpyridine) Brushes
The influence of
swelling on the molecular dynamics of poly(2-vinylpyridine)
(P2VP) brushes is measured by broadband dielectric spectroscopy (BDS)
in a broad temperature (350–420 K) and spectral (0.1 Hz–1
MHz) range with nanostructured, highly conductive silicon electrodes,
separated by 35 nm high insulating silica spacers. A “grafting-to”
method is applied to prepare P2VP brushes with a grafting density
σ = 0.12 nm<sup>–2</sup> and a film thickness <i>d</i> = 7.3 nm as measured by ellipsometry. Swelling of the
P2VP brushes is realized with tetrahydrofuran (THF) vapor using a
flow cell. In the dry state, the segmental dynamics of the P2VP brushes
coincides with the dynamic glass transition of the bulk system while
in the swollen state it becomes faster by up to 1–2 decades
due to the plasticizing effect of THF