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Customer publications

Customer publications

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…
Xenocs
12 March 2019
Customer publications

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…
Xenocs
12 March 2019
Customer publications

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…
Xenocs
12 March 2019
Customer publications

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…
Xenocs
12 March 2019
Customer publications

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…
Xenocs
12 March 2019
Customer publications

Ferrihydrite Nanoparticle Aggregation Induced by Dissolved Organic Matter

Gentile, Luigi; Wang, Tao; Tunlid, Anders; Olsson, Ulf; Persson, Per

Ferrihydrite (Fh) nanoparticles are omnipresent in nature and often highly mobile because of their colloidal stability. Thus, Fh serves as a vector for iron as well as associated nutrients and contaminants. Here, we demonstrate, using small-angle X-ray scattering combined with cryo-transmission electron microscopy (cryo-TEM), that dissolved organic matter (DOM), extracted…
Xenocs
12 March 2019
Customer publications

Highly Entangled α-Olefin Molecular Bottlebrushes: Melt Structure, Linear Rheology, and Interchain Friction Mechanism

López-Barrón, Carlos R.; Tsou, Andy H.; Hagadorn, John R.; Throckmorton, Joseph A.

Linear viscoelastic response and melt microstructure of ultra-high molecular weight poly(α-olefins) (UHMW PO) with bottlebrush architectures, from poly(1-hexene) to poly(1-octadecene) synthesized by metal coordinative insertion polymerization, were measured as a function of side-chain length, Nsc. All these bottlebrush POs are highly entangled, with an average number of entanglements per chain,…
Xenocs
12 March 2019
Customer publications

Ring-Banded Spherulitic Crystals of Poly(3-butylthiophene) via Controlled Solvent Evaporation

Armas, Jeremy A.; Reynolds, Karina J.; Marsh, Zachary M.; Stefik, Morgan; Scott, Gregory E.; Zhang, Shanju

The preparation of ring-banded spherulites in poly(3-butylthiophene) via controlled solvent evaporation of solution-cast films is reported. The spherulites display unusual concentric ring-banded structures under both polarized and unpolarized lights. The size of the ring-banded spherulites is 300 ± 100 µm in diameter and the periodicity of the bands is 15…
Xenocs
12 March 2019