TY - JOUR A1 - Hildebrand, Viet A1 - Heydenreich, Matthias A1 - Laschewsky, Andre A1 - Moeller, Heiko M. A1 - Müller-Buschbaum, Peter A1 - Papadakis, Christine M. A1 - Schanzenbach, Dirk A1 - Wischerhoff, Erik T1 - "Schizophrenic" self-assembly of dual thermoresponsive block copolymers bearing a zwitterionic and a non-ionic hydrophilic block JF - Polymer : the international journal for the science and technology of polymers N2 - Several series of presumed dual thermo-responsive diblock copolymers consisting of one non-ionic and one zwitterionic block were synthesized via consecutive reversible addition-fragmentation chain transfer (RAFT) polymerization. For all copolymers, poly(N-isopropylmethacrylamide) was chosen as non-ionic block that shows a coil-to-globule collapse transition of the lower critical solution temperature (LCST) type. In contrast, the chemical structure of zwitterionic blocks, which all belonged to the class of poly(sulfobetaine methacrylate)s, was varied broadly, in order to tune their coil-to-globule collapse transition of the upper critical solution temperature (UCST) type. All polymers were labeled with a solvatochromic fluorescent end-group. The dual thermo-responsive behavior and the resulting multifarious temperature-dependent self-assembly in aqueous solution were mapped by temperature resolved turbidimetry, H-1 NMR spectroscopy, dynamic light scattering (DLS), and fluorescence spectroscopy. Depending on the relative positions between the UCST-type and LCST-type transition temperatures, as well as on the width of the window in-between, all the four possible modes of stimulus induced micellization can be realized. This includes classical induced micellization due to a transition from a double hydrophilic, or respectively, from a double hydrophobic to an amphiphilic state, as well as "schizophrenic" behavior, where the core- and shell-forming blocks are inverted. The exchange of the roles of the hydrophilic and hydrophobic block in the amphiphilic states is possible through a homogeneous intermediate state or a heterogeneous one. (C) 2017 Elsevier Ltd. All rights reserved. KW - RAFT polymerization KW - Block copolymer KW - Sulfobetaine methacrylate KW - Responsive polymer KW - LCST KW - UCST KW - Schizophrenic self-assembly Y1 - 2017 U6 - https://doi.org/10.1016/j.polymer.2017.06.063 SN - 0032-3861 SN - 1873-2291 VL - 122 SP - 347 EP - 357 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Gyollai, Viktor A1 - Schanzenbach, Dirk A1 - Somsak, Laszlo A1 - Linker, Torsten T1 - Addition of malonyl radicals to glycals with C-1 acceptor groups: remarkable influence of the substituents on the product distribution Y1 - 2002 ER - TY - JOUR A1 - Glatzel, Julia A1 - Noack, Sebastian A1 - Schanzenbach, Dirk A1 - Schlaad, Helmut T1 - Anionic polymerization of dienes in ‘green’ solvents JF - Polymer international N2 - Isoprene and beta-myrcene were polymerized by anionic polymerization in bulk and in the 'green' ether solvents cyclopentyl methyl ether and 2-methyltetrahydrofuran and, for comparison, in cyclohexane and tetrahydrofuran. The polydienes produced in bulk and in cyclohexane contained high amounts of 1,4 units (>90%) whereas those produced in ether solvents were rich in 1,2 and 3,4 units (36%-86%). Comparison of the microstructures and glass transition temperatures of the polydienes obtained in the various solvents suggests that conventionally used solvents can be substituted by environmentally more friendly alternatives. KW - isoprene KW - β‐myrcene KW - anionic polymerization KW - green KW - solvents KW - microstructure KW - glass transition Y1 - 2020 U6 - https://doi.org/10.1002/pi.6152 SN - 0959-8103 SN - 1097-0126 VL - 70 IS - 2 SP - 181 EP - 184 PB - Wiley CY - Hoboken ER - TY - JOUR A1 - Rottmann, Antje A1 - Synstad, Bjoenar A1 - Thiele, G. A1 - Schanzenbach, Dirk A1 - Eijsink, Vincent G. H. A1 - Peter, Martin G. T1 - Approaches towards the design of new chitinase inhibitors Y1 - 1999 SN - 3-9806494-5-8 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Pospieszny, Henryk A1 - Schanzenbach, Dirk A1 - Peter, Martin G. T1 - Biodegradation of chitosan Y1 - 1999 SN - 83-87202-68-1 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Pospieszny, Henryk A1 - Schanzenbach, Dirk A1 - Peter, Martin G. T1 - Biodegradation of chitosan Y1 - 1998 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Pospieszny, Henryk A1 - Schanzenbach, Dirk A1 - Peter, Martin G. T1 - Biodegradation of various chitosans using Aspergillus fumigatus Y1 - 2001 ER - TY - JOUR A1 - Schanzenbach, Dirk A1 - Peter, Martin G. T1 - Chromatography of chito-oligosaccarides Y1 - 1997 ER - TY - JOUR A1 - Schanzenbach, Dirk A1 - Matern, Christa-Maria A1 - Peter, Martin G. T1 - Cleavage of chitin by means of sulfurice acid/acetc anhydride and isolation of peracetylated chito- oligosaccharides Y1 - 1997 ER - TY - JOUR A1 - Reitenbach, Julija A1 - Geiger, Christina A1 - Wang, Peixi A1 - Vagias, Apostolos N. A1 - Cubitt, Robert A1 - Schanzenbach, Dirk A1 - Laschewsky, André A1 - Papadakis, Christine M. A1 - Müller-Buschbaum, Peter T1 - Effect of magnesium salts with chaotropic anions on the swelling behavior of PNIPMAM thin films JF - Macromolecules : a publication of the American Chemical Society N2 - Poly(N-isopropylmethacrylamide) (PNIPMAM) is a stimuli responsive polymer, which in thin film geometry exhibits a volume-phase transition upon temperature increase in water vapor. The swelling behavior of PNIPMAM thin films containing magnesium salts in water vapor is investigated in view of their potential application as nanodevices. Both the extent and the kinetics of the swelling ratio as well as the water content are probed with in situ time-of-flight neutron reflectometry. Additionally, in situ Fourier-transform infrared (FTIR) spectroscopy provides information about the local solvation of the specific functional groups, while two-dimensional FTIR correlation analysis further elucidates the temporal sequence of solvation events. The addition of Mg(ClO4)2 or Mg(NO3)2 enhances the sensitivity of the polymer and therefore the responsiveness of switches and sensors based on PNIPMAM thin films. It is found that Mg(NO3)2 leads to a higher relative water uptake and therefore achieves the highest thickness gain in the swollen state. Y1 - 2023 U6 - https://doi.org/10.1021/acs.macromol.2c02282 SN - 0024-9297 SN - 1520-5835 VL - 56 IS - 2 SP - 567 EP - 577 PB - American Chemical Society CY - Washington ER -