Polymer-Nanoschäume aus Mikroemulsion (English shop)

Preview

Table of Contents, Datei (48 KB)
Extract, Datei (73 KB)

Nanocellular materials can contribute to energy efficiency in various ways, e.g. as a perfect insulating material (nanofoam) or as a thin layer with a low refractive index for more efficient light extraction from organic light-emitting diodes (OLEDs). Nanoscale microemulsions provide the optimal starting point for producing closed- or open-cell nanofoams. After formulating a microemulsion with a supercritical fluid, still nanometre-sized gas bubbles are formed from the nanometre-sized microemulsion droplets upon pressure reduction according to the Principle of Supercritical Microemulsion Expansion (POSME) (DE 10260815B4). The foam is fixed by polymerisation. The fixation of the resulting nanofoam is impeded by coalescence and Ostwald ripening. In this work, strategies were developed to suppress these ageing processes. In this way, the finest possible, monodisperse foam is to be achieved. Using several examples from various polymer classes, such as melamine-formaldehyde resins, polyurethanes, electrically conducting polymers based on oxetane-functionalised triphenylamine dimers and polymethacrylates, first nanofoams were obtained and further approaches were outlined, bringing the industrial production of nanofoams according to POSME within reach.