Schindler, Torben; González, Adrián; Boopathi, Ramachandran; Roda, Marta Marty; Romero-Santacreu, Lorena; Wildes, Andrew; Porcar, Lionel; Martel, Anne; Theodorakopoulos, Nikos; Cuesta-López, Santiago
Kinky DNA in solution: Small-angle-scattering study of a nucleosome positioning sequence
Physical Review E, 2018, vol 98, 4, pp. 42417DOI:Back to the overview
Modular Synthesis and Structure Analysis of P3HT-b-PPBI Donor–Acceptor Diblock Copolymers
Heinrich, C. David; Fischer, Matthias; Thurn-Albrecht, Thomas; Thelakkat, Mukundan
While donor–acceptor block copolymers (BCPs) are widely discussed to be optimal model materials for studying the morphology-dependent processes in organic photovoltaics, the observation of the desired microphase-separated structures is rare. We present a novel modular approach for the synthesis of donor–acceptor block copolymers offering a fast and flexible way for…
Sulfophenylated Terphenylene Copolymer Membranes and Ionomers
Skalski, Thomas J. G.; Adamski, Michael; Britton, Benjamin; Schibli, Eric M.; Peckham, Timothy J.; Weissbach, Thomas; Moshisuki, Takashi; Lyonnard, Sandrine; Frisken, Barbara J.; Holdcroft, Steven
The copolymerization of a prefunctionalized, tetrasulfonated oligophenylene monomer was investigated. The corresponding physical and electrochemical properties of the polymers were tuned by varying the ratio of hydrophobic to hydrophilic units within the polymers. Membranes prepared from these polymers possessed ion exchange capacities ranging from 1.86 to 3.50 meq g−1 and…
QCM detection of molecule–nanoparticle interactions for ligand shells of varying morphology
Marsh, Zachary M.; Lantz, Kayla A.; Stefik, Morgan
Nanoparticles (NP) have widespread applications from sensing to drug delivery where much behavior is determined by the nature of the surface and the resulting intermolecular interactions with the local environment. Ligand mixtures enable continuously tunable behavior where both the composition and morphology influence molecular interactions. Mixed ligand shells form multiple…
The Underestimated Effect of Intracrystalline Chain Dynamics on the Morphology and Stability of Semicrystalline Polymers
Schulz, Martha; Seidlitz, Anne; Kurz, Ricardo; Bärenwald, Ruth; Petzold, Albrecht; Saalwächter, Kay; Thurn-Albrecht, Thomas
Semicrystalline polymers have been classified into crystal-mobile and crystal-fixed polymers, depending on the existence or absence of intracrystalline chain dynamics. Although it was claimed that polymers with intracrystalline chain dynamics generally have a higher crystallinity, its effect on the semicrystalline morphology is not known in detail. Using a new approach…
Aligning in-plane polarization multiplies piezoresponse in P(VDF-TrFE) films on graphite
Roth, Robert; Koch, Martin; Schaab, Jakob; Lilienblum, Martin; Syrowatka, Frank; Band, Tino; Thurn-Albrecht, Thomas; Dörr, Kathrin
New Journal of Physics, 2018, vol 20, 10, pp. 103044DOI:10.1088/1367-2630/aae8b6Visit the full articleBack to the overview
Enthalpy of formation and disordering temperature of transient monotropic liquid crystals of poly(butylene 2,6-naphthalate)
Androsch, René; Soccio, Michelina; Lotti, Nadia; Jehnichen, Dieter; Göbel, Michael; Schick, Christoph
Melt-crystallization of poly(butylene 2,6-naphthalate) (PBN) at temperatures lower than about 160 °C follows Ostwald's rule of stages via intermediate formation of a smectic liquid crystalline phase (LC-phase). The transient LC-phase has been isolated by interruption of the isothermal crystallization process at 140 °C at sub-second timescale, and then its disordering was analyzed…
Stretching PEO–PPO Type of Star Block Copolymer Gels: Rheology and Small-Angle Scattering
Mortensen, Kell; Annaka, Masahiko
Cross-linked Tetronic star block copolymer gels, based on poly(ethylene oxide) and poly(propylene oxide), behave quite regular with respect to mechanical properties, but exhibits unusual absence of structural response to strain. The elastic response is linear up to more than 100% strain, with a steady-state modulus of the order of 0.01…
Microstructures of cellulose coagulated in water and alcohols from 1-ethyl-3-methylimidazolium acetate: contrasting coagulation mechanisms
Hedlund, Artur; Köhnke, Tobias; Hagman, Joel; Olsson, Ulf; Theliander, Hans
Coagulation of cellulose solutions is a process whereby many useful materials with variable microstructures and properties can be produced. This study investigates the complexity of the phase separation that generates the structural heterogeneity of such materials. The ionic liquid, 1-ethyl-3-methylimidazolium acetate (), and a co-solvent, dimethylsulfoxide (DMSO), are used to…
Ion Transport in Glassy Polymerized Ionic Liquids: Unraveling the Impact of the Molecular Structure
Heres, Maximilian; Cosby, Tyler; Mapesa, Emmanuel Urandu; Liu, Hongjun; Berdzinski, Stefan; Strehmel, Veronika; Dadmun, Mark; Paddison, Stephen J.; Sangoro, Joshua
The impact of molecular structure on ion dynamics and morphology in ammonium- and imidazolium-based glassy polymerized ionic liquids (polyILs) is investigated using broadband dielectric spectroscopy (BDS), wide-angle X-ray scattering (WAXS), and classical molecular dynamics (MD) simulations. It is shown that ammonium-based polyILs exhibit higher dc ionic conductivity at their respective…