A5026961238- Polymer crystallization and properties
- Flame retardant materials and properties
- biodegradable polymer synthesis and properties
- Rheology and Fluid Dynamics Studies
- Block Copolymer Self-Assembly
- Polymer Foaming and Composites
- Carbon Nanotubes in Composites
- Polymer Nanocomposites and Properties
- Fiber-reinforced polymer composites
- Material Dynamics and Properties
- Synthesis and properties of polymers
- Advanced Polymer Synthesis and Characterization
- Fire dynamics and safety research
- Polymer composites and self-healing
- Additive Manufacturing and 3D Printing Technologies
- Surfactants and Colloidal Systems
- Advanced Sensor and Energy Harvesting Materials
- Spectroscopy and Quantum Chemical Studies
- Lattice Boltzmann Simulation Studies
- Polymer Surface Interaction Studies
- Composite Material Mechanics
- Electrospun Nanofibers in Biomedical Applications
- Mechanical Behavior of Composites
- Nanopore and Nanochannel Transport Studies
- Carbon dioxide utilization in catalysis
Swiss Federal Laboratories for Materials Science and Technology
2017-2024
Maastricht University
2022-2024
Montanuniversität Leoben
2015-2017
Polymers are indispensable to humans in different applications due their ease of manufacturing and overall performance. However, after a material lifetime, there is large amount polymer-based waste, which greatly contributes the loss valuable resources environmental pollution. Thermoplastics may be readily recycled, but because flammability, amounts flame retardant (FR) additives required for many applications. This results significant volume FR polymeric wastes too, particularly halogenated...
This study addresses very important aspects of the sustainable development new flame retardant materials: (i) preparation a novel (FR) additive from bio-resource, (ii) its use as FR in poly(lactic acid) (PLA) based composites and, (iii) vitro toxicity assessment FR. The synthesis this bio-based was achieved through phospha-Michael addition diphenylphosphine oxide (DPPO) and naturally occurring compound coumarin, yielding 4-(diphenylphosphoryl)chroman-2-one (CU-DPPO). flame-retarded CUDPPO...
Flame-retarded polymers, such as polyester textiles and sheets, are attracting attention with regard to their sustainability. Mechanical recycling is currently the most frequently used technique for improving circularity of plastics. However, one complication mechanical associated (still) inevitable mixtures polymers additives, which can influence material stability significantly deteriorate properties recycled products. In this study, we aim specifically investigate interactions between...
Partially aromatic polyamides owing to their excellent thermal stability are widely used in high temperature applications, however, like aliphatic counterparts, they readily flammable and more challenging process. In this work, several organophosphorus flame retardants were synthesized compounded with partially polyamide evaluated for processability, thermal, fire behaviour. The compounds containing a commercial retardant, Exolit® OP 1230 (EX), two new retardants, namely...
Abstract This study attempts to promote biobased polyamide 56 (PA56) as a sustainable candidate replace commercial PA6 and PA66 when blended with polyethylene terephthalate (PET). Scanning transmission electron microscopy of the blends different PA56 contents reveals an immiscible morphology increase in size dispersed domains by increasing content. The steady‐state mixing torque kneader is decreased half adding 10 wt% PET. Further addition gradually increases this but does not surpass neat...
Luminescent solar concentrators (LSCs) collect incoming sunlight and direct it to a smaller-area photovoltaic cell. In the presented work, form factor illumination angle-dependent performance of LSCs consisting bi-component melt-spun fibers is demonstrated. Three thermoplastic polymers act as dispersing host material for luminescent dye Lumogen Red 305 (LR305). Molecular dynamics simulations provide numerical access Hildebrand solubility parameters, which are an estimate mixing compatibility...
Poly(ethylene terephthalate) (PET) has wide usage in packaging and fiber industries thanks to its superior mechanical, thermal, barrier properties. It is also one of the "big five" recyclable plastics with well-established procedures. In many textile film products, flame retardants (FRs) are added PET for fire-safe applications. However, PET/FR products often not designed recycling, downgrade during thermomechanical recycling due polymer degradation. To address this issue, we study behavior...
Three novel alkyl sulfone bridged phosphorus (P) compounds namely 6,6′-(sulfonylbis(ethane-2,1-diyl))bis(dibenzo[c,e][1,2]oxaphosphinine 6-oxide) (SEDOPO), sulfonylbis(ethane-2,1-diyl))bis(diphenylphosphine oxide) (SEDPPO), and tetraphenyl (sulfonyl bis(ethane-2,1-diyl)) bis(phosphonate) (SEDPP) (i.e. phosphine oxide, phosphinate phosphonate, respectively) were synthesized via a Michael addition reaction with good yields (≥ 85%) at 200-g scale. They exhibited thermal stability above 250 °C,...
The (re-)processing and degradation behavior of polypropylene (PP) blends with high-density polyethylene (HDPE) is a crucial topic in mechanical recycling due to the prevalence PP/HDPE mixtures. In particular, small amounts cross-contamination (below 10.0 wt.%) between these polyolefins are quite common. While much empirical data available, systematic studies on such scarce rarely account for polymers' chain structure. This study employs time-resolved rheology, atomic force microscopy (AFM),...
The deformation of carbon nanotube (CNT)‐filled PA6 droplets in PP matrix was examined under simple shear flows. morphology blends with various CNT contents were probed by FE‐SEM. Based on the wetting coefficient calculations and rheological measurements, it noted that majority CNTs selectively located phase for concentrations up to 2 wt%. TEM micrographs evidenced results a sample 0.5 wt% PA6. Optical microscopy during flows revealed reduced deformability breakups filled‐droplets. Such...
ABSTRACT The aspect ratio of rod‐like nanofillers is an important factor that governs their percolation threshold in nanocomposites with a polymer interest. Controlling the length distribution filler effective way to manipulate onset network formation and thereby materials properties are related latter. use two or more different types dissimilar special case achieve such control. We here report modification existing mechanical model describe binary nanofillers. was exemplarily applied...
We have investigated the structural response of melt-spun poly-3-hydroxybutyrate (P3HB) fibers to stress and temperature its impact on mechanical properties. Low-stress (≤1.6 MPa, 100–130 °C) annealed P3HB showed a considerable viscoelastic behavior remained ductile up at least two months. Stress annealing with high weights (≥32 MPa), however, lead higher tensile strength (182 MPa) lower elongation break (22%). These significant differences in properties are closely related changes, which we...
Poly(hydroxybutyrate-co-3-hexanoate) (PHBH) is a biodegradable thermoplastic polyester with the potential to be used in textile and medical applications. We have aimed at developing an upscalable melt-spinning method produce fine PHBH filaments without use of ice water bath or offline drawing techniques. evaluated effect different polymer grades (mol% 3-hydroxy hexanoate, molecular weight etc.) production parameters on tensile properties melt-spun filaments. monofilaments (diameter < 130 µm)...
The interactions and conformational characteristics of confined molten polypropylene (PP) chains between ferric oxide (Fe2O3) substrates were investigated by molecular dynamics (MD) simulations. A comparative analysis the adsorbed amount shows strong adsorption on high-energy surface Fe2O3. Local structures formed in polymer film studied utilizing density profiles, orientation bonds, end-to-end distance chains. At interfacial regions, backbone carbon-carbon bonds preferably orient direction...
The orientation of a three-layered silicate particle in uncompatibilized and compatibilized polymer melts is studied under shear flows utilizing dissipative dynamics (DPD). Based on trajectories, pair distribution functions are calculated orthogonal planes. Regardless the applied flow direction, it shown that layers rearrange themselves so their surfaces would be normal to velocity gradient direction. maximum stress values fall numerical uncertainties systems while they show characteristic...
Polydisperse linear polymers are studied in startup of steady shear flow simulations using dissipative particle dynamics. The results show that with an increase polydispersity the stress overshoot declines while steady‐state increases. Various physical characteristics systems including frequency nonbonded interactions, gyration radius data, alignment angles, and average bond lengths. patterns data suggest higher forces necessary to orient stretch long chain fractions direction. Relaxation...
The adhesion of the polymer to ceramic nanoparticles is a key aspect in manufacturing parts by additive and injection molding, due poor separation results during processing. purpose this research investigate, means molecular dynamics simulations experimental methods, role improved interfacial interactions acrylic acid grafting-high density polyethylene on zirconia composite properties. grafting high nanoparticles, increases dispersion improves viscoelastic mechanical properties required for molding.