Polymere Hydrogele in der Abdichtungstechnik – Untersuchungen zum Quellungsdruck

Abstract

Polymere Hydrogele werden in der letzten Zeit vermehrt auch im Bereich der Abdichtungstechnik eingesetzt. Die Anwendung der Materialien erfolgt dabei zumeist empirisch und basiert auf dem Quellungsdruck, den die Polymere bei der Aufquellung in einem fest vorgegebenen Volumen entwickeln. Die hier entwickelte Methode der Bestimmung des Quellungsdrucks bei vorgegebenem Endvolumen der Quellung ist für detaillierte Untersuchungen, wie sie im Hinblick auf die Optimierung von Materialien für die Abdichtungstechnik notwendig sind, sehr gut anwendbar. Darüber hinaus ermöglicht sie auch mechanistische Aussagen zum Stofftransport während des Quellungsprozesses.

Glucose-Responsive Polymeric Hydrogel Materials: From a Novel Technique for the Measurement of Glucose Binding toward Swelling Pressure Sensor Applications

“…If glucose is added, it binds to PBA and therefore occupies possible binding sites for hydrogen bonds. This is the reason why a smaller Φ is causing larger changes of ΔSP. , When the Φ of the hydrogel inside the chamber is lower, it contains more water at the beginning of the measurement and more bound water can be released due to glucose binding. Although it is generating a smaller initial pressure, the impact on the relative change is larger.…”

“…Moreover, pressure sensors are robust, established for long-term use and are therefore advantageous over other sensing concepts . In our previous research, we had already established the use of sensor setups measuring the swelling pressure of hydrogels. − In the present work, the representation of measurement conditions of a medical application was considered by the construction of the sensing setups. The hydrogels shall in the future be available as a sensor material in medical implants.…”

“…Finally, we anticipated the results from swelling measurements in free volume being transferrable to the swelling pressure measurements. Although the polymer volume fraction has a high influence on the absolute swelling pressure, − the general behavior of the hydrogels should be the same. The swelling pressure as a function of glucose concentration was analyzed, revealing that, with some of the synthesized hydrogels, glucose can be analyzed quantitatively under physiologically relevant conditions by using a pressure sensor setup.…”

Preparation and properties of swellable thermoplastic elastomer alloys based on elastomeric powder, polypropylene, and superabsorbent polymer

“…In this work, we will focus on the development of water swellable materials that can be used as self‐repairing systems in the field of sealing technology by combining the properties of elastomeric powders (EP), thermoplastics (TP), and superabsorbent polymers (SAP). With the materials obtained, new self‐repairing sealing systems can be developed, as already established for polymeric hydrogels 14. The products that can be realized from the material obtained are applicable particularly in the field of civil engineering and pipe technology,15 e.g., in the form of a sealing ring for sealing sewer pipes or sealing gas/water house service lines as well as cable wall ducts.…”