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Polyurethanes with POSS pendent on flexible hard segments: Morphology and glass transition

Koutsoumpis, Stefanos; Ozimek, Jan; Raftopoulos, Konstantinos N.; Hebda, Edyta; Klonos, Panagiotis; Papadakis, Christine M.; Pielichowski, Krzysztof; Pissis, Polycarpos

Customer publications

Polyurethanes with POSS pendent on flexible hard segments: Morphology and glass transition

Koutsoumpis, Stefanos; Ozimek, Jan; Raftopoulos, Konstantinos N.; Hebda, Edyta; Klonos, Panagiotis; Papadakis, Christine M.; Pielichowski, Krzysztof; Pissis, Polycarpos

Polyhedral Oligomeric Silsesquioxanne (POSS) moieties are tethered on a polyurethane chain, as side groups on the hard domains, which are based on the flexible hexamethylene diisocyanate (HDI). Their effect on morphology, and consequently on molecular dynamics, is studied in detail by microscopy, scattering, spectroscopic, thermal, and dielectric techniques. Albeit the…
Emulsion-Based RIR-MAPLE Deposition of Conjugated Polymers: Primary Solvent Effect and Its Implications on Organic Solar Cell Performance

Ge, Wangyao; Li, Nan K.; McCormick, Ryan D.; Lichtenberg, Eli; Yingling, Yaroslava G.; Stiff-Roberts, Adrienne D.

Customer publications

Emulsion-Based RIR-MAPLE Deposition of Conjugated Polymers: Primary Solvent Effect and Its Implications on Organic Solar Cell Performance

Ge, Wangyao; Li, Nan K.; McCormick, Ryan D.; Lichtenberg, Eli; Yingling, Yaroslava G.; Stiff-Roberts, Adrienne D.

Emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) has been demonstrated as an alternative technique to deposit conjugated polymer films for photovoltaic applications; yet, a fundamental understanding of how the emulsion target characteristics translate into film properties and solar cell performance is unclear. Such understanding is crucial to enable the…
Effect of Source on the Properties and Behavior of Cellulose Nanocrystal Suspensions

Schütz, Christina; Van Rie, Jonas; Eyley, Samuel; Gençer, Alican; van Gorp, Hans; Rosenfeldt, Sabine; Kang, Kyongok; Thielemans, Wim

Customer publications

Effect of Source on the Properties and Behavior of Cellulose Nanocrystal Suspensions

Schütz, Christina; Van Rie, Jonas; Eyley, Samuel; Gençer, Alican; van Gorp, Hans; Rosenfeldt, Sabine; Kang, Kyongok; Thielemans, Wim

Sulfuric acid hydrolysis of native cellulose fibers results in colloidally stable suspensions of cellulose nanocrystals (CNCs). We have investigated the effect of the cellulose source on the suspension properties of CNCs extracted from cotton and wood sources using a comparable preparation strategy. The structural properties were revealed to be similar…
Fabrication and characterization of Ba3Zn2Fe24O41 (Zn2Z) hexaferrites films on silicon substrates

Al-Hwaitat, Eman; Al-Hussein, Mahmoud; Mahmood, Sami H.; Bsoul, Ibrahim

Customer publications

Fabrication and characterization of Ba3Zn2Fe24O41 (Zn2Z) hexaferrites films on silicon substrates

Al-Hwaitat, Eman; Al-Hussein, Mahmoud; Mahmood, Sami H.; Bsoul, Ibrahim

We report the fabrication and characterization of Ba3Zn2Fe24O41 (Zn2Z) hexaferrite films on silicon substrates using a simple sol-gel drop casting method. A combination of X-ray diffraction (XRD), scanning electron microscope (SEM), grazing incidence wide angle X-ray scattering (GIWAXS) and vibrating sample magnetometer (VSM) was used to characterize the structural and…
Densely grafted liquid crystalline copper phthalocyanine side chain polymer: synthesis and characterization

Heinrich, C. David; Kostakoğlu, Sinem Tuncel; Thelakkat, Mukundan

Customer publications

Densely grafted liquid crystalline copper phthalocyanine side chain polymer: synthesis and characterization

Heinrich, C. David; Kostakoğlu, Sinem Tuncel; Thelakkat, Mukundan

A new polymeric donor material with pendant copper phthalocyanine side chains (PCuPc) was synthesized. The excellent suitability of a grafting-to approach, combining the controlled radical polymerization of propargyloxystyrene followed by “click” chemistry, was demonstrated. A polymer with a high molecular weight (Mn = 88 000 g mol−1) and a narrow…
On the Formation and Morphology of Lipid Nanoparticles Containing Ionizable Cationic Lipids and siRNA

Kulkarni, Jayesh A.; Darjuan, Maria M.; Mercer, Joanne E.; Chen, Sam; van der Meel, Roy; Thewalt, Jenifer L.; Tam, Yuen Yi C.; Cullis, Pieter R.

Customer publications

On the Formation and Morphology of Lipid Nanoparticles Containing Ionizable Cationic Lipids and siRNA

Kulkarni, Jayesh A.; Darjuan, Maria M.; Mercer, Joanne E.; Chen, Sam; van der Meel, Roy; Thewalt, Jenifer L.; Tam, Yuen Yi C.; Cullis, Pieter R.

Lipid nanoparticles (LNPs) containing short interfering RNA (LNP-siRNA) and optimized ionizable cationic lipids are now clinically validated systems for silencing disease-causing genes in hepatocytes following intravenous administration. However, the mechanism of formation and certain structural features of LNP-siRNA remain obscure. These systems are formed from lipid mixtures (cationic lipid,…
Extensional Strain Hardening Induced by $ensuremath{pi}text{ensuremath{-}}ensuremath{pi}$ Interactions in Barely Entangled Polymer Chains: The Curious Case of Poly(4-vinylbiphenyl)

López-Barrón, Carlos R.; Zhou, Huaxing

Customer publications

Extensional Strain Hardening Induced by $ensuremath{pi}text{ensuremath{-}}ensuremath{pi}$ Interactions in Barely Entangled Polymer Chains: The Curious Case of Poly(4-vinylbiphenyl)

López-Barrón, Carlos R.; Zhou, Huaxing

Aromatic π−π interactions between phenyl groups of adjacent chains in poly(4-vinylbiphenyl) (PVBP) have profound effects on the dynamics of this polymer. We report two unexpected nonlinear viscoelastic responses of PVBP when subjected to uniaxial flow. One is the unprecedented observation of extensional strain hardening (SH) in a barely entangled polymer…