Abstract
AbstractThough widely applied in various technological areas, the knowledge about the molecular behavior of poly‐p‐xylylene and its derivatives prepared via chemical vapor deposition polymerization is still far from comprehensive, as for this polymer the characterization is limited due to the insolubility in most common solvents. This report presents the investigation of the swelling properties of aminomethyl‐functionalized poly‐p‐xylylene as a means to elucidate the influence of various process parameters on the structural properties of the polymer layer. The swelling of films with varying thickness, storage time and conditions, thermal treatment and deposited by varying the temperature of the deposition stage is measured. To gain deeper insight into the origin of the observed effects, the swelling measurements by spectroscopic ellipsometry are complemented using additional characterization methods.
Highlights
Though widely applied in various technological areas, the knowledge about polymer films is inherent to the vaporthe molecular behavior of poly-p-xylylene and its derivatives prepared via chemical vapor deposition polymerization is still far from comprehensive, as for this polymer the characterization is limited due to the insolubility in most common solvents
If the probability for one of these processes changes over the course of the deposition, this should result in a change in molecular weight of the polymer chains and in the crosslinking density, which will in turn be reflected in the swelling properties of the polymer film
The polymer chains are not mobile enough to arrange according to the interaction with the substrate or alternatively the orientation in the first layer in direct vicinity to the substrate is kept throughout the layer, since the chains are not able to relax into the confirmation they would take on under the influence of polymer–polymer interactions only
Summary
PPX-AM thin films were prepared via CVD of 4-aminomethyl-[2.2] paracyclophane (PCP-AM) using varying precursor amounts and varying deposition temperatures. These samples were subjected to thermal annealing or storage processes, and the influence on the pH-responsive swelling properties was studied using in situ spectroscopic ellipsometry (SE) and supplemental methods
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