TY  - JOUR
A1  - Sauter, Tilman
A1  - Lützow, Karola
A1  - Schossig, Michael
A1  - Kosmella, Hans
A1  - Weigel, Thomas
A1  - Kratz, Karl
A1  - Lendlein, Andreas
T1  - Shape-memory properties of polyetherurethane foams prepared by thermally induced phase separation
JF  - Advanced engineering materials
N2  - In this study, we report the preparation of two structurally different shape-memory polymer foams by thermally induced phase separation (TIPS) from amorphous polyetherurethanes. Foams with either a homogeneous, monomodal, or with a hierarchically structured, bimodal, pore size distribution are obtained by adoption of the cooling protocol. The shape-memory properties have been investigated for both foam structures by cyclic, thermomechanical experiments, while the morphological changes on the micro scale (pore level) have been compared to the macro scale by an in situ micro compression device experiment. The results show that the hierarchically structured foam achieves higher shape-recovery rates and a higher total recovery as compared to the homogeneous foam, which is due to an increased energy storage capability by micro scale bending of the hierarchically structured foam compared to pure compression of the homogeneous foam.
Y1  - 2012
U6  - https://doi.org/10.1002/adem.201200127
SN  - 1438-1656
VL  - 14
IS  - 9
SP  - 818
EP  - 824
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - CHAP
A1  - Sauter, Tilman
A1  - Lützow, Karola
A1  - Schossig, Michael
A1  - Kosmella, Hans
A1  - Weigel, Thomas
A1  - Kratz, Karl
A1  - Lendlein, Andreas
T1  - Pore morphology as structural parameter to tailor the shape-memory effect of polyuetherurethane foams
T2  - Abstracts of papers : joint conference / The Chemical Institute of Cananda, CIC, American Chemical Society, ACS
Y1  - 2013
SN  - 0065-7727
VL  - 245
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Wischke, Christian
A1  - Baehr, Elen
A1  - Racheva, Miroslava
A1  - Heuchel, Matthias
A1  - Weigel, Thomas
A1  - Lendlein, Andreas
T1  - Surface immobilization strategies for tyrosinase as biocatalyst applicable to polymer network synthesis
JF  - MRS Advances
N2  - Enzymes have recently attracted increasing attention in material research based on their capacity to catalyze the conversion of polymer-bound moieties for synthesizing polymer networks, particularly bulk hydrogels. hi this study. the surface immobilization of a relevant enzyme. mushroom tyrosinase, should be explored using glass as model surface. In a first step. the glass support was functionalized with silanes to introduce either amine or carboxyl groups, as confirmed e.g. by X-ray photoelectron spectroscopy. By applying glutaraldehyde and EDC/NHS chemistry, respectively, surfaces have been activated for subsequent successful coupling of tyrosinase. Via protein hydrolysis and amino acid characterization by HPLC, the quantity of bound tyrosinase was shown to correspond to a full surface coverage. Based on the visualized enzymatic conversion of a test substrate at the glass support. the functionalized surfaces may be explored for surface-associated material synthesis in the future.
Y1  - 2018
U6  - https://doi.org/10.1557/adv.2018.630
SN  - 2059-8521
VL  - 3
IS  - 63
SP  - 3875
EP  - 3881
PB  - Cambridge Univ. Press
CY  - New York
ER  -