Materials Literature
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5-Aminolevulinic acid (5ALA) is the key synthetic building block in protoporphyrin IX (PpIX), the heme chromophore in mitochondria. In this study density functional theory calculations were performed on the tautomers of 5ALA and the tautomerization reaction mechanism from its enolic forms (5-amino-4-hydroxypent-3-enoi…
Thin polymer films containing polyaniline doped with several organic dopants were manufactured and their conductivity was measured. The effect of chloroform vapour on the composite film conductivity was examined. The possibility of fabricating polyaniline-based chemiresistors working as gas detectors was taken into co…
Effects of maleimidophenylmethacrylates on thermal stability of polystyrene have been examined by dynamic thermogravimetric analysis in air conditions. The maleimidophenylmethacrylates with substitutes of various molecular architecture in imide cycle have been built in polystyrene macromolecular chains (as much as 1 m…
Ionic conductivity of four chitosan based electrolyte systems viz., chitosan–H3PO4, chitosan–H3PO4–Al2SiO5, chitosan–H3PO4–NH4NO3 and chitosan–H3PO4–NH4NO3–Al2SiO5 were studied by impedance spectroscopy in the frequency range from 50 Hz to 1 MHz and varying temperatures from 293 K to 373 K. The sample 0.62 chitosan −…
Molecular switch: Porphyrin dimers incorporating a quinone or hydroquinone unit as the bridge have been synthesized by palladium-catalyzed cross-coupling reactions. Their electronic absorptions and electrochemistry show that this type of molecules acts as a switchable molecular wire (see scheme).
This work presents a cyclic voltammetry study of the polyaniline/polyluminol copolymer on platinum electrodes. The results show that under determined conditions it is possible to obtain the copolymer deposited on a metallic surface. The luminol presence clearly affects the oxidation of aniline in the nucleation proces…
Abstract The supramolecular structure in pipe walls of isotactic PP‐R is a function of compound composition and processing parameters, which both influence the mechanical properties of the pipes. µFTIR shows a gradient of the crystallinity across the pipe wall, with a lower‐crystalline outer layer, and a higher‐crysta…
In this article the temperature dependence of absorption spectra of vacuum sublimed cobalt phthalocyanine (CoPc) thin layer is presented. For comparison the optical properties of CoPc solution were also investigated. Absorption measurements revealed strong intermolecular interaction in the solid form as well as the pr…
In this work, transparent luminescent nanocomposites were obtained using manganese – doped ZnS nanoparticles with crystallite sizes of about 10 nm, dispersed in the monomer isobornyl acrylate (IBOA). Suited nanocrystals of Mn2+-doped ZnS have been prepared by arrested precipitation in the presence of capping agents li…
Abstract A series of novel biodegradable aromatic– aliphatic poly(ester amide)s containing approximately equal amounts of amide and ester groups were successfully prepared through the interfacial polycondensation of 1,6‐hexanediamine and aromatic diacylchlorides containing ethylene oxide moieties. The structure of the…
Hereinafter we discuss our last five years investigations in the field of new highly efficient polymers for liquid crystal (LC) photoalignment. New polymers finally proposed are based on methacryloylaminoarylmethacrylates with two methacryloyl groups of different reactivity. Fries rearrangement and photocrosslinking/p…
Static and dynamic characteristics of layerwise growth in two-dimensional quasiperiodic Ito-Ohtsuki tilings are studied. These tilings are the projections of three-dimensional stepped surfaces. It is proved that these tilings have hexagonal self-similar growth with bounded radius of neighborhood. A formula is given fo…
The aim of this work is to study the replacement of currently used thermoplastics by composites reinforced with vegetable fibers with several advantages, mainly better mechanical properties, low weight and competitive cost compared to its counterparts. Extrusion and injection molding processes were studied using polyp…
Abstract The nonisothermal crystallization kinetics of a metallocene‐made isotactic polypropylene (m‐iPP) and its compounds with 0.1 wt % and 0.3 wt % of a sorbitol derivative [1,3:2,4‐bis(3,4‐dimethylbenzylidene)sorbitol (DMDBS); an α nucleator] were investigated by differential scanning calorimetry at different cool…
A highly fluorescent s-triazine (ST) bridged p-phenylene vinylene (PPV) polymer was synthesized by the Wittig polycondensation reaction of 4, 6-bis (4-formylphenoxy)-2-diphenylamino-s-triazine and 2, 5-bis (triphenylphosphonionmethyl)-1, 4-bis (trimethylsilyl) benzene dibromide, to afford ST bridged PPV polymer (DTTPV…
In this study, oil palm empty fruit bunch fibres (EFB) reinforced polypropylene (PP) composites were prepared by two different methods i.e. physical treatment of the composites using electron beam irradiation and chemical treatment by adding coupling agent such as maleated PP. The composites pellets were then subjecte…
In the case of doped polymer system SHG efficiency is proportional to the concentration and orientation degree of NLO-active molecules. Unfortunately, corona poling realised at elevated temperatures causes concentration decrease of NLO-active molecules due to crystallization. On the basis of our studies of the film op…
Abstract Flexible heaters were prepared by extruding platinum‐catalyzed silicone rubber (SR) compound with carbon black (CB)/multiwalled carbon nanotube (MWNT) and CB/SnO 2 ‐Sb coated titanium dioxide (TiO 2 ). MWNT with average particle length of 20 μm and acicular shaped TiO 2 with average particle length of 1.7 μm…
Abstract The effect of different coagents on the physico‐chemical properties of NBR/HDPE composites reinforced with 40 phr (part per hundred part of rubber by weight) HAF carbon black and cured with accelerated electrons was investigated. The coagents N , N ′‐methylene bisacrylamide (MBAAm) and trimethylol propane tri…
The bacterial envelope stress response, which is responsible for sensing stress signals in the envelope and for turning on the sigma(E)-dependent transcription, is modulated by the binding of RseB to RseA. In this study, the solution structures of RseA and its complex with RseB were analyzed using circular dichroism a…