Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.64: Poster

Donnerstag, 3. April 2014, 15:00–19:00, P2

Using small angle neutron scattering and light scattering to investigate thermoresponsive copolymer microgels — •Bastian Wedel, Johannes Bookhold, and Thomas Hellweg — Universität Bielefeld, Universitätsstraße 25, Bielefeld, Germany

Temperature responsive microgels undergo a volume phase transition (VPT) at a certain temperature (VPTT). It is this specific property that makes such kind of structures interesting for various applications, such as sensors, nanoactuators or as drug delivery systems. An optimal performance of microgels requires a method for an adjustment of the application-specific properties. A suitable and easy method is constituted by the copolymerization of different monomers.

We present a study dealing with the investigation of the physical and structural properties of copolymer microgels based on different temperature responsive alkylacrylamide derivatives with consimilar structures. The used monomers are N-n-propylacrylamide (NNPAM), N-isopropylacrylamide (NIPAM) and N-isopropylmethacrylamide (NIPMAM) with VPTTs of the homopolymer microgels of 22 ^∘C, 32 ^∘C and 43 ^∘C respectively.

We analyzed the dependence of the feed composition and the surfactant concentration in the reaction solution at various temperatures to get an insight into the structural changes during the volume phase transition. Photon correlation spectroscopy and static light scattering were used to investigate the swelling behavior and the overall structure. Furthermore, we performed small angle neutron scattering experiments to clarify the structure on the lengthscale of the polymer network.