Materials Literature
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Abstract The cocrystallization behavior of poly( n ‐octadecyl methacrylate) (POMA) and its blends with corresponding fatty acid ( n ‐octadecanoic acid) (C 18 ) was explored by differential scanning calorimetry (DSC) and X‐ray diffraction studies. The DSC curves for blended samples of POMA with C 18 show the characteri…
The structure of core–shell latex particles of polymethylmethacrylate (the core) and polyurethane (the shell) have been investigated by methods of small-angle X-ray scattering (SAXS) and atom-force microscopy. A set of SAXS patterns has been obtained using contrast variation method. Indirect methods have been used to…
In the tropical and subtropical regions, there is a large number of species which has not been yet described. The high possibility of extinction makes their inventory a priority. In this paper, 23 diatoms taxa from Andean lotic systems and lentic waterbodies localized in the Departments of Antioquia, Santander and Cho…
Abstract The chemical modification of isotactic polypropylene was performed by the free‐radical‐promoted grafting of 1,1,1‐trimethylolpropane trimethacrylate (TMPTMA) in the presence of dicumyl peroxide (DCP) as the initiator. The reaction was carried out both in a batch internal mixer and in a corotating twin‐screw e…
Abstract Nonisothermal melt crystallization kinetics of biodegradable PBSU/PVPh blend was investigated with differential scanning calorimetry (DSC) from the viewpoint of practical application. PBSU/PVPh blends were cooled from the melt at various cooling rates ranging from 2.5 to 40°C/min. The crystallization peak tem…
Abstract A series of organic‐soluble polynaphthalimides (PNI) bearing flexible ether links and phthalide cardo group were synthesized from 1,4,5,8‐naphthalenetetracarboxylic dianhydride (NTDA) with 3,3‐bis[4‐(4‐aminophenoxy)‐3‐methylphenyl]phthalide (BAMP) and its equimolar mixtures with other dietheramines by high‐te…
The structure of glasses is characterized by the existence of density and composition fluctuations on the nanometre scale. We present three examples of the use of small-angle X-ray scattering to get information about these density fluctuations. The thermal history and OH content were observed to have a huge influence.…
Abstract An analysis of the crystallization kinetics of different grades of isotactic polypropylene (iPP) is here presented. To describe the crystallization kinetics as a function of molecular and operating parameters, the methodological path followed was the preparation of quenched samples of known cooling histories,…
Linear absorption spectra, resonance Raman spectra and excitation profiles, and two-photon-resonant hyper-Rayleigh and hyper-Raman scattering hyperpolarizability profiles are reported for the push-pull chromophore N,N-dipropyl-p-nitroaniline in seven solvents spanning a wide range of polarities. The absorption spectra…
The various quantum chemical models of catalytic active site in Cu−ZSM-5 zeolites are analyzed. The density functional theory (DFT) is used to calculate the electronic structure of molecular cluster (HO) 3 Al−O−Cu−O−Cu modeling the catalytic active site in Cu−ZSM-5 zeolites and study the interaction and decomposition…
Abstract Hydrosilylation of α,ω‐bis(trimethylsiloxy)methylhydrosiloxane to alkenes in the presence of a catalyst was performed at several temperatures (30–70°C). Comb‐type methylsiloxane oligomers with various alkyl substituted groups in the side chains have been obtained. Not all active ≡SiH groups participate in th…
Abstract Graft copolymers of sodium carboxymethylcellulose with N ‐vinyl‐2‐pyrrolidone were prepared in aqueous solutions with azobisisobutyronitrile as the initiator. The graft copolymers [sodium carboxymethylcellulose‐ g ‐poly( N ‐vinyl‐2‐pyrrolidone)] were characterized with Fourier transform infrared spectroscopy,…
In this paper, the proof of principle of microwave-accelerated aggregation assay technology, which shortens the solution-based aggregation assays' run time to seconds (>100-fold increase in kinetics) with microwave heating, was demonstrated using a model aggregation assay based on the well-known interactions of biotin…
Integer quantum Hall effect is studied for a noninteracting electron in a monolayer graphene. We calculate the Hall conductivity within a single Landau level in the presence of randomness in the bond couplings and in the on-site potential, and estimate the critical energies for the quantum Hall transition. We show tha…
SUMMARIES Our aim was to investigate the behaviour of iron species (Fe(II), Fe(III) in prepared iron-gall inks deposited on the Whatman paper and their destructive effects on cellulose chains during accelerated ageing at 60°C and 65% relative humidity, constant. The attention was focused to examine the changes of opti…
Centimeters-long double-walled carbon nanotube strands were irradiated by a 355 nm pulsed laser. Multiwalled carbon nanofibers, hollow and solid onion-like nanoparticles, were found to be changed from DWNTs, induced by UV laser irradiation. As-grown Fe catalysts were also found to aggregate and were conveniently able…
Lead zinc niobate–lead zirconate titanate (PZN–PZT) nano‐sized powders with a diameter of ∼35 nm were fabricated by a high‐energy stirred media mill using 50 μm diameter zirconia beads as the milling media at a rotation speed of 4000 rpm for 1 h. The sintering temperature of PZN–PZT was greatly reduced, and a fully de…
The crystallization behavior of microbially synthesized poly(3-hydroxybutyrate) was studied in detail using time-resolved small-angle X-ray scattering. This polyester was found to undergo primary crystallization as well as secondary crystallization. In the primary crystallization, the thicknesses of the lamellar cryst…
Abstract Multiwalled carbon nanotubes (MWNTs) with acyl chloride functional groups and a metallocene polyethylene–octene elastomer (POE) or an acrylic acid‐grafted metallocene polyethylene–octene elastomer (POE‐ g ‐AA) were used to prepare hybrids (POE/MWNTs or POE‐ g ‐AA/MWNTs) using a melting method, with a view to…
Abstract According to the classical nucleation theory, the free energy barrier for bubble nucleation, and thereby the nucleation rate, are functions of the initial bubble pressure, P bubble, 0 . In almost all of the previous studies that have used computer simulations to investigate polymeric foaming processes, the va…