Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Interfaces and Thin Films and Responsive and Adaptive Systems

CPP 37.4: Vortrag

Donnerstag, 8. September 2022, 11:45–12:00, H39

Investigations of ultra-thin film behavior of polycarbonate on inorganic surfaces — •Hassan Omar, Paulina Szymoniak, and Andreas Schönhals — Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany

Thin polymer films are of vital importance due to their low production costs and wide range of applications in sensors, electronics, and coatings. Their geometry is ideal for the study of confinement effects on the thermodynamic properties and segmental dynamics of polymers. However, there is little research into these effects for main chain polymers such as polycarbonate (PC). PC has important applications due to its improved mechanical, optical, and thermal stability compared to other polymers. For this investigation, films of PC ranging from 200 nm to 7 nm were prepared on both glass and silica substrates to measure the dielectric and calorimetric behavior. The methodology consisted of broadband dielectric spectroscopy (BDS), ellipsometry, atomic force microscopy (AFM), and sum frequency generation (SFG). Using ellipsometry, the glass transition was shown to increase with decreasing film thickness. This was further proved by BDS for glassy dynamics for thin films employing different sample geometries (crossed electrode and nanostructured capacitors). The properties and influence of the adsorbed layer on the molecular mobility was also addressed by a combination of AFM, SFG and BDS.