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Correlating molecular and crystallization dynamics to macroscopic fusion and thermodynamic stability in fused deposition modeling; a model study on polylactides

Srinivas, Varun; van Hooy-Corstjens, Catharina S. J.; Harings, Jules A. W.

Customer publications

Correlating molecular and crystallization dynamics to macroscopic fusion and thermodynamic stability in fused deposition modeling; a model study on polylactides

Srinivas, Varun; van Hooy-Corstjens, Catharina S. J.; Harings, Jules A. W.

To define molecular parameters for fused deposition modeling of mechanically integral polylactide parts, the effect of intrinsic local heat fluctuations on morphology and structure evolution is studied. Macroscopic fusion during melt deposition is governed by molecular dynamics of solidification and positively affected by low print speed, low molar mass. However,…
In Operando Small-Angle X-ray Scattering Investigation of Nanostructured Polymer Electrolyte for Lithium-Ion Batteries

Möhl, Gilles E.; Metwalli, Ezzeldin; Müller-Buschbaum, Peter

Customer publications

In Operando Small-Angle X-ray Scattering Investigation of Nanostructured Polymer Electrolyte for Lithium-Ion Batteries

Möhl, Gilles E.; Metwalli, Ezzeldin; Müller-Buschbaum, Peter

Electrochemical energy storage still presents one of the biggest challenges that society has to face by developing alternative lithium-ion batteries (LIBs) as they already satisfy important preconditions by providing the highest energy and power densities of all battery systems. Nowadays, the employed liquid electrolytes in LIBs do not merge the…
Long Walks in Hierarchical Porous Materials due to Combined Surface and Configurational Diffusion

Vattipalli, Vivek; Qi, Xiaoduo; Dauenhauer, Paul J.; Fan, Wei

Customer publications

Long Walks in Hierarchical Porous Materials due to Combined Surface and Configurational Diffusion

Vattipalli, Vivek; Qi, Xiaoduo; Dauenhauer, Paul J.; Fan, Wei

Hierarchical materials with porous structures at different length scales (i.e., micropore and mesopore) are an emerging class of materials. However, the lack of fundamental understanding of mass transport properties significantly limits rational development of these materials for applications in catalysis and separation. In this study, we evaluated the mass transport…
Ion Transport and Interfacial Dynamics in Disordered Block Copolymers of Ammonium-Based Polymerized Ionic Liquids

Harris, Matthew A.; Heres, Maximilian F.; Coote, Jonathan; Wenda, André; Strehmel, Veronika; Stein, Gila E.; Sangoro, Joshua

Customer publications

Ion Transport and Interfacial Dynamics in Disordered Block Copolymers of Ammonium-Based Polymerized Ionic Liquids

Harris, Matthew A.; Heres, Maximilian F.; Coote, Jonathan; Wenda, André; Strehmel, Veronika; Stein, Gila E.; Sangoro, Joshua

A series of diblock copolymers bearing a polymerized ionic liquid (polyIL) block (poly(N-(methacryloyloxy)ethyl-N,N-dimethyl-N-ethylammonium bis(trifluoromethylsulfonyl)imide)) and a noncharged block (poly(methyl methacrylate) (PMMA)) or poly(n-butyl methacrylate) (PBuMA)) were studied using differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), wide-angle X-ray scattering…
Cellulose gelation in NaOH solutions is due to cellulose crystallization

Pereira, Ana; Duarte, Hugo; Nosrati, Pegah; Gubitosi, Marta; Gentile, Luigi; Romano, Anabela; Medronho, Bruno; Olsson, Ulf

Customer publications

Cellulose gelation in NaOH solutions is due to cellulose crystallization

Pereira, Ana; Duarte, Hugo; Nosrati, Pegah; Gubitosi, Marta; Gentile, Luigi; Romano, Anabela; Medronho, Bruno; Olsson, Ulf

Cellulose gelation in 2 M NaOH aqueous solution was followed by time resolved turbidity and rheology measurements. The kinetics of gelation is observed to change from several hours down to few seconds when the temperature is increased from 25 to 30 °C. The increase of turbidity upon gelation demonstrates the…
Complex effect of graphite nanoplatelets on performance of HDPE/PA66 microfibrillar composites

Kelnar, Ivan; Bal, Ümitcan; Zhigunov, Alexander; Kaprálková, Ludmila; Fortelný, Ivan; Krejčíková, Sabina; Kredatusová, Jana

Customer publications

Complex effect of graphite nanoplatelets on performance of HDPE/PA66 microfibrillar composites

Kelnar, Ivan; Bal, Ümitcan; Zhigunov, Alexander; Kaprálková, Ludmila; Fortelný, Ivan; Krejčíková, Sabina; Kredatusová, Jana

The effect of nanofillers (NF) on parameters of polymer blends in microfibrillar composites (MFC) is complex due the effect of NF on melt drawing. This work concerns HDPE/PA66 modified with graphite nanoplatelets (GNP) prepared by different mixing protocols. GNP influence the dispersed phase size in the original blend negligibly and…
Effects of isolated chemical and mechanical degradation stressors on the ionomer morphology in fuel cell membranes

Venkatesan, Senthil Velan; Kjeang, Erik

Customer publications

Effects of isolated chemical and mechanical degradation stressors on the ionomer morphology in fuel cell membranes

Venkatesan, Senthil Velan; Kjeang, Erik

The present work aims to understand the specific effects of isolated chemical and mechanical degradation stressors on the morphology and physico-chemical properties of fuel cell membranes. Chemical and mechanical degradation stressors are isolated in two specific, carefully designed accelerated stress tests of fuel cells. Degraded membranes are then extracted and…