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Search results for: emerytowany profesor Uniwersytetu
Łódzkiego. Zajmuje się kulturą i recepcją literatury romantycznej; poeta-
mi dwudziestolecia międzywojennego Krystyna Ratajska – prof. dr hab.
Models have been proposed to describe the rheology of immiscible polymer blends in relation to their morphologies, either for dilute droplet emulsions or for concentrated blends with complex interfaces. The morphologies obtained in reactively compatibilized blends are the result of a complex interplay between instabilities due to chemical reaction at interfaces and drop breakup and coalescence processes...
Waste electrical and electronic equipment (WEEE) have attracted attention due to their high pollutant potential and increasing volume produced in recent years as function of the modernization and continuum substitution of the current equipment that quickly become obsolete. Among polymeric materials that make up the WEEE, acrylonitrile-butadiene-styrene (ABS) and high-impact polystyrene (HIPS) copolymers...
The influence of oleic acid modified Fe3O4 (OA-Fe3O4) nanoparticles on the morphology and foaming behavior of cocontinuous linear low density polyethylene/polystyrene (LLDPE/PS) immiscible blends (60/40 by weight) was studied. The morphology observation showed that the addition of nanofillers resulted in the increased dispersion degree of both LLDPE and PS components and even the transformation of...
Corn starch based polylactide acid (PLA) and 2,5-furandicarboxylic acid (FDCA) based poly(butylene 2,5-furan dicarboxylate) (PBF) are melt blended together, and the binary bio-based blends show high reflectivity by several processing methods, including hot pressing, injection molding and 3D printing. We use optical microscopy to study the underlying structures and find that the phase separated and...
We proposed a systematic and simulation-free strategy for the structure-based coarse graining of multi-component polymeric systems using the polymer reference interaction site model theory, and as an example applied it to a simple model system of binary polymer blends. Our structure-based coarse graining ensures that the original and coarse-grained (CG) systems have the same intra- and intermolecular...
In this study, we investigate the effect of multi-walled carbon nanotube (MWCNT) on the rheology, morphology and broadband dielectric properties of polypropylene:polystyrene (PP:PS) blends (PP:PS—10:90, 50:50 and 90:10). Transmission electron microscopy showed that MWCNTs were localized at the interface and inside the PS phase, regardless of the polymer blend ratio. Employing scanning electron microscopy,...
By influencing both the interfacial adhesion and the morphology, compatibilizers determine the mechanical properties of polymer blends. Here, we study the mechanical properties, in particular the fatigue crack propagation (FCP) of immiscible blends of poly(2,6-dimethyl-1,4-phenylene ether)/poly(styrene-co-acrylonitrile) (PPE/SAN), compatibilized with Janus nanoparticles (JPs) and linear polystyrene-block-polybutadiene-block-poly(methyl...
The mechanism governing the electrical properties for phase separating blends containing multiwall carbon nanotubes (MWNTs) is unravelled by tuning the compatibilization efficiency. Thereto, compatibilization by interfacially segregated block and random copolymers (cp) of poly(styrene-random/block-methyl methacrylate)(PS-r/b-PMMA) was achieved in phase separating blends of poly[(α-methyl styrene)-co-acrylonitrile]/poly(methylmethacrylate)...
Two solution reactors in series are utilized to synthesize poly(ethylene-cb-propylene) comb block copolymers, P(E-cb-P), where the first reactor prepares vinyl terminated atactic polypropylene (aPP) macromers from propylene using an organometallic catalyst favoring beta methyl elimination and the second reactor copolymerizes aPP macromers with ethylene using a different organometallic catalyst capable...
Computer simulation could be a useful technique to scrutinize the properties of individual polymers as well as their blends. However, there is no work on computer simulation of thermoplastic elastomer from rubber-plastic blends. As representative example, binary compatibility of polyamide 6 (PA6) with fluoroelastomer (FKM) for a 40/60 composition of PA6/FKM thermoplastic elastomer was investigated...
This paper investigates the porphyrin de-aggregation in a set of guest-host films, prepared by spin coating, in a series of poly(n-alkyl methacrylate)s matrices. UV–Vis optical absorbance and steady-state photoluminescence spectroscopy in association with the fluorescence lifetime imaging technique (FLIM) helped to characterize the film blends. All the PnMA matrices de-aggregated the porphyrin molecules...
We reported the first Monte Carlo study of incompressible symmetric binary homopolymer blends. Using fast lattice Monte Carlo simulations (Q. Wang, Soft Matter 5 (2009) 4564–4567) in a semi-grand-canonical ensemble with the cooperative motion algorithm generalized in our previous work (P. Zhang, Q. Wang, J. Phys. Chem. B 118 (2014) 12059–12067) and the finite-size scaling theory, we studied the critical...
Polypropylene (PP)/ethylene propylene diene rubber (EPDM) thermoplastic vulcanisates (TPVs) were prepared by electron induced reactive processing without use of any chemical vulcanizing agent, co-agent or other type of additive. Thus, the composition of PP/EPDM blend is not changed by this novel process and relationships between raw material, process, morphology and properties of TPVs can be studied...
In this report, hierarchical self-organization of poly(tert-butyl acrylate) (PtBA) brush- and mixed PtBA/polystyrene (PS) brush-grafted silica nanoparticles (NPs) in PtBA-b-PS block copolymer and PtBA/PS polymer blend matrices having different molecular weights was investigated using transmission electron microscopy (TEM). Driven by the entropic interactions between the brushes and the polymer matrices...
Silica/polystyrene Janus hybrid nanoparticles (JHNPs) were synthesized at the gram scale via miniemulsion polymerization technique and then incorporated into polystyrene/polyamide-6 melted blends. Due to their intrinsic amphiphilic properties, the JHNPs migrate to the interface of the PS/PA6 blend during the mixing process and play the role of a compatibilizing agent. First, a significant decrease...
The polymer regioregularity has a dramatic effect on device performance of organic photovoltaics in terms of material crystallinity and phase separated morphology. In this study, we investigated the molecular regioregularity induced morphological evolution of P3HT and PF12TBT blend thin films processed by solvents with different solubility and boiling point. After cast by good solvents chloroform...
A study of the structure and properties of binary blends of syndiotactic polypropylene (sPP) having different degrees of stereoregularity and synthesized by different metallocene catalysts, is reported. The blends have been prepared by mixing a stereoregular and crystalline sample with [rrrr] = 78% with low stereoregular and poorly crystalline samples having [rrrr] = 54.6 and 45.8%, and a nearly atactic...
The glass transition temperature (Tg) of a polystyrene (PS) nanolayer is shown to be strongly tuned by the presence of neighboring immiscible polymer layers over a 100 °C range spanning temperatures above and below the bulk PS Tg. Fluorescence spectroscopy is used to measure the glass transition temperature (Tg) of the ultrathin dye-labeled PS layers at specific regions within multilayer films of...
The effect of compatibilization with a symmetrical polystyrene-block-polybutadiene-block-poly(methyl methacrylate) (SBM) triblock terpolymer on the morphological and mechanical properties (specifically toughness) of immiscible poly(2,6-dimethyl-1,4-phenylene ether)/poly(styrene-co-acrylonitrile) (PPE/SAN) blends with different blend (w/w) ratios is investigated. We study the effect of blend viscosity...
This work studies the effects of thermodynamic and kinetic parameters on the localization and migration of spherical micro- and nano-silica particles in the high interfacial tension blend system of poly (lactic acid), (PLA)/low density polyethylene (LDPE). The surface modification of micro-silica particles from a high to a low energy surface was carried out by the grafting of (2-Dodecen-1-yl) succinic...
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