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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.
In this work, we have systematically studied the miscibility and phase structure of a hydrogen-bonded polymer blend composed of short rigid poly(N-acryloyl piperidine) (PAP) and long flexible poly(acrylic acid) (PAA). Ultrathin PAP/PAA blend films with various compositions were prepared by solution-casting method. It was found that the spin-coated blend films had distinct surface features with many...
The addition of ethyl ester l-lysine tri-isocyanate (LTI) to mixtures of poly(lactide)/poly(ε-caprolactone) has been reported to improve the compatibility of the resulting blends. In the present work, we have investigated the influence of adding increasing amounts of LTI to the mechanical and thermal properties of the blends. Torque trends, plate-plate rheology, differential scanning calorimetry,...
Grazing incidence small angle X-ray scattering (GISAXS) methods are frequently very successfully utilized for morphological investigations of thin polymer blend films used in organic photovoltaics. However, conventional GISAXS does no longer provide material sensitivity when the blend consists of more than two components due to the contrast conditions. In case of multi-component blends the use of...
Semi-crystalline polylactide (PLA)/polyolefin multi-component blends were used as precursors for the generation of a new class of micro-cellular polymers. Either a polypropylene-based elastomer (PBE) or polypropylene (PP) homopolymer were utilized as dispersed phases at the 10 wt% level. An epoxy-functionalized terpolymer (PEGMMA) was introduced (1 wt%) as a reactive compatibilizer to reduce the dispersed...
Polymorphic crystallization behaviors in amorphous/crystalline polymer blends of cis-1,4-polyisoprene/trans-1,4-polyisoprene (CPI/TPI) have been not fully understood so far. In this work, we investigated the effects of CPI content and crystallization temperature on crystal nucleation, spherulite growth rate and crystallinity of α- and β-TPI crystals with X-ray diffraction (XRD) and polarized optical...
Interphase transfer of di-2-ethylhexyl adipate (DOA) between ethylene-propylene copolymer (EPR) and polyisobutylene (PIB) in the laminated sheets was studied. It was found that the amount of DOA in each phase is determined by the ambient temperature. DOA moved to EPR from PIB at −20 °C and vice versa at 40 °C, when the DOA content before lamination was 10 phr. This is attributed to the change of interaction...
The technique of surface segregation was applied to prepare a bio-inert polymer interface. A small amount, 10 wt%, of poly(2-methoxyethyl acrylate) (PMEA), which exhibits excellent bio-inertness properties, fed into a matrix polymer was able to suppress platelet adhesion sufficiently to be of practical use. PMEA was effective because it was preferentially segregated at the outermost region of the...
Hierarchically porous polymers with controllable pore size were generated through a novel polymer blending strategy in an A/B/C–B–C ternary blend system. Polylactide/high-density polyethylene/poly(styrene-ethylene/butylene-styrene) triblock copolymer (PLA/HDPE/SEBS) was used as a model system to demonstrate this technique. During melt blending, the SEBS was driven into the HDPE phase owing to the...
We have fabricated ternary blend solar cells based on poly(3-hexylthiophene) (P3HT) as a donor material, poly{[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} (N2200) as an acceptor material, and a silicon naphthalocyanine derivative (SiNc) as a near-IR sensitizer. In order to discuss how molecular structures impact the dye sensitization in P3HT/N2200...
Co-continuous polycarbonate (PC)/poly(styrene-acrylonitrile) (SAN) = 60/40 wt.% blends were filled with 1 wt.% multi-walled carbon nanotubes (MWCNTs), which selectively localized within the PC component. To study the influence of the viscosity ratio, PCs with different viscosities were selected resulting in PC/SAN viscosity ratios (at 100 rad/s) between 1.2 and 4.5. With increasing viscosity ratio,...
Structurally well-defined C 4 F 9 , C 7 F 15 , C 10 F 21 and C 13 F 27 end-functionalized polystyrene (RF-PS) and polybutylmethacrylate (RF-PBMA) were prepared by Atom Transfer Radical Polymerization using RF–tagged initiators. Blends (1/1 wt/wt) of these polymers were studied by differential scanning calorimetry (DSC), atomic force microscopy...
Temperature dependence of lamellae orientation of a branched low molecular weight polyethylene (B-LMWPE)/ultra-high molecular weight polyethylene (UHMWPE) blend film has been studied by using transmission electron microscopy (TEM), two-dimensional wide angle X-ray diffraction (2D-WAXD) and two-dimensional small angle X-ray scattering (2D-SAXS). The film was prepared by solution casting under a controlled...
Janus particles are superior to ordinary Pickering emulsifiers. Widespread industrial usage is however hampered by the restricted accessibility of these polar colloids. Whereas established synthesis protocols that allow for breaking the symmetry of colloid surfaces are laborious and expensive, here we use Janus particles that are based on the ubiquitous layered silicate kaolinite. As a consequence...
To analyze the interplay between crystallization and liquid–liquid phase separation (LLPS), isothermal crystallization behavior of poly(ethylene glycol) (PEG) in blends with isotactic poly(methyl methacrylate) (i-PMMA) was investigated by differential scanning calorimetry (DSC). The blend system had an upper critical solution temperature (UCST) type phase diagram. When the crystallization occurred...
The complete transfer of multiwalled carbon nanotubes (MWCNTs) from a poly(styrene acrylonitrile) (SAN) precompound into an initially unfilled polycarbonate (PC) phase during 5 min of discontinuous melt mixing in a microcompounder has been observed recently. However, the typical time scale of the occurring transfer is presently still unknown. Morphological investigations within our study revealed...
The mechanical behavior of binary polymer blends polystyrene/polypropylene were studied by a continuous mesoscopic simulation method. The dynamic density functional theory approach embodied in MesoDyn method was adopted to obtain the meso-structures of polymer blends. The output of MesoDyn serves as the input of a micromechanical lattice spring model (LSM), which consists of a three-dimensional network...
Partial wetting in a ternary polymer blend is the thermodynamic state where all three phases meet at a three-phase line of contact. Pickering emulsions, where solid particles situate at the interface of two other phases is a classic example of this state. This paper studies the presence of partial wetting in PE/PP/PS and in PE/PP/PC ternary polymer blends and examines, in particular, the influence...
Within small molecules, the hydrogen-bonding behaviors affected by delocalization have been studied thoroughly, but rare publication in macromolecules. Therefore, three poly(N-phenyl methacrylamide)s, poly(N-phenyl methacrylamide) (PNPAA), poly(N-4-methoxyphenyl methacrylamide) (PMPMA) and poly(N-4-bromophenyl methacrylamide) (PBPMA), with different inductive substitution at para position of benzene...
In this work we report on the preparation of a solid, 3D, low percolation threshold conductive device prepared through the control of multiple encapsulation and multiple percolation effects in a 5 component polymer blend system through melt processing. Conductive polyaniline (PANI) is situated in the core of the 5 component continuous system comprised of high-density polyethylene (HDPE), polystyrene...
The co-continuous morphology of polymer blends has received much attention not only because of its potential promotion of mechanical or electrical properties of polymer blends, but also due to its importance in phase separation by spinodal decomposition. Compared to the recent advances in the characterization of co-continuous structure, the rheology of co-continuous blends has not been understood...
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