Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Focus: Smart Hydrogels and Hydrogel Based Devices II - organized by Gerald Gerlach, Walter Richtering and Thomas Hellweg

CPP 37.6: Vortrag

Mittwoch, 14. März 2018, 11:30–11:45, C 130

Smart membranes by electron beam cross-linking of copolymer microgels — •Johannes Bookhold and Thomas Hellweg — Universität Bielefeld, Bielefeld, Deutschland

The aim of this contribution is the preparation of free-standing, transferable microgel layers from cross-linkable microgels. The approach is based on the deposition of microgels, containing aromatic moieties, by spincoating on a sacrificial gold layer. During this work NIPAm has been copolymerized with N-Benzylhydrylacrylamide (BHAm) in order to manufacture novel cross-linkable microgels. After confirmation of the incorporation of the copolymer via PCS and IR-spectroscopy measurements into the polymer network, monolayers of the microgels were spin-coated onto gold coated silicon-wafers. Afterwards the incorporated aromatic comonomers were irradiated using an electron beam leading to a cross-linking of the microgels. The cross-linked microgel-monolayer was detached from the wafer through the dissolving of the gold coating in an acidic environment. In order to perform temperature dependent diffusion measurements the detached membrane was transferred onto a silica-nitrate chip with a pinhole. In a microfluidic device the diffusion through the covered pinhole was determined using conductivity measurements.