Materials Literature
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Abstract The kinetics of melt intercalation of poly(propylene)/montmorillonite nanocomposites was studied by a rheological approach. The experimental sample was elaborately prepared to investigate the whole intercalating process. The intercalation process was demonstrated by the changes of the viscoelastic response wi…
Robust noncentrosymmetric polymer networks with a net polarization and bulk pyroelectric properties are achieved by aligning a polymerizable bent-core mesogen in the liquid-crystalline state and cross-linking under a static electric field (see schematic representation).
In this paper, we report the fabrication and characterization of polyaniline colloid (PANIC) multilayer thin films prepared from PANIC aqueous dispersion and a polyelectrolyte solution. Both chiral and achiral PANICs were used to fabricate multilayer thin films of up to 30 bilayers. Transmission electron microscopy, a…
Abstract Silk fibers and membranes were acylated with octadecenylsuccinic anhydride (ODSA) at 75°C for different times. Swelling [ N,N ‐dimethylformamide (DMF) and dimethyl sulfoxide (DMSO)] and nonswelling (xylene) solvent media were used for the reaction. Silk membranes that reacted in DMF or DMSO displayed faster r…
Abstract The aim of this study was to compare different models, either originating from literature or originally proposed in this study, for the interpretation of the melting behavior of polymers. In particular, these models, tested with a linear low‐density polyethylene widely used in rotational molding, are suitable…
Abstract β‐Methyl‐α‐methylene‐γ‐butyrolactone (MMBL) was synthesized and then was polymerized in an N,N ‐dimethylformamide (DMF) solution with 2,2‐azobisisobutyronitrile (AIBN) initiation. The homopolymer of MMBL was soluble in DMF and acetonitrile. MMBL was homopolymerized without competing depolymerization from 50 t…
Raman spectroscopy has been used to investigate picosecond vibrational dynamics of the molecular glass-former phenyl salicylate (salol). The study has concentrated on the elucidation and comparison of molecular dynamics of salol subjected to different local environments, namely in bulk, in a dilute CCl4 solution, and…
A remarkable and unprecedented increase in catalyst selectivity in dendrimer catalysis is observed for the Pyrphos-Pd catalysed allylic amination of 1,3-diphenyl-1-acetoxypropene as a function of the dendrimer generation (with up to 64 metal sites). This steady increase in ee-values for the allylic amination is less p…
Abstract Two kinds of regenerated cellulose membranes for hemodialysis were prepared from casting solutions of N ‐methylmorpholine‐ N ‐oxide (NMMO) and cuprammonium (denoted NMMO membranes and cuprammonium membranes, respectively). The concentration of cellulose in the casting solution investigated was 6–8 wt %. The p…
Abstract Controlled thermolysis of gold(I) complex, [Au(C13H27COO)(PPh3)], at 180 °C for 5 h under an N2 atmosphere affords the new type of monodispersed spherical gold nanoparticles capped by myristate and a small amount of PPh3 ligands (average diameter 23 ± 1.5 nm), in spite of no use of solvent, reducing agent and…
IR irradiation of a boron thin film coated on a Si(001) wafer in the presence of Mg vapor in an Ar/O2 atmosphere results in the formation of magnesium borate nanotubes (see picture). The structural characterizations demonstrated that the nanotubes are single crystalline orthorhombic Mg3B2O6 (3 MgO⋅B2O3). The formation…
N-acetylneuraminate lyase (NAL) and dihydrodipicolinate synthase (DHDPS) belong to the NAL subfamily of (betaalpha)(8)-barrels. They share a common catalytic step but catalyze reactions in different biological pathways. By rational design, we have introduced various mutations into the NAL scaffold from Escherichia col…
The surface of a polypropylene (PP) film was modified using acetone and acetone/oxygen. Significant improvement in surface energy was observed due to plasma treatment. The chemical nature and stability of the surface modification was studied by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectros…
Abstract Rheological properties of nylon‐1212 have been studied by means of Haake Rheometer. The effect of shear rate and temperature on the apparent vicosity of nylon‐1212 was discussed. A correlation of non‐Newtonian index with the temperature was obtained. The results showed that the apparent viscosity decreases wi…
By highly correlated ab initio methods and DFT calculations, we have shown that alkaline metals can stabilize planar tetracoordinate carbon-containing molecules with the C(C4) skeleton. This family of molecules is C5M2, where M is an alkaline metal. The stability of these compounds is rationalized in terms of the delo…
Abstract The search for new materials for tailor‐made applications and new devices involves not only solid‐state chemists, physicists or materials engineers, but also the area molecular and organo‐metallic chemistry, and even biochemistry. This is especially clear in the field of organic–inorganic multifunctional mate…
The hole story? A super-supertetrahedral anionic cluster of 214 atoms and 80 tetrahedral units is prepared. The crystal structure has finite tetrahedral units of [Cd16In64S134]44− ions composed of four T4 supertetrahedra (see picture). Each cluster is nearly a regular tetrahedron with edge lengths of 31.06 and 31.07 Å…
We consider a few dipolar organic molecules in several of their packing arrangements to understand the aggregation effect. We have performed an extensive semiempirical calculations based on multireference doubles configuration interactions for the dimer arrangements. This is coupled with a simple theory based on dipol…
Bridging the generation gap: Building up molecules of considerable molecular weight in a step-by-step manner from small units generally consumes energy and produces a lot of waste. This is not the case here since only three steps are necessary to built a dendrimer of generation 3 (MW around 265 000), bearing 750 phosp…
Three effects define deformation‐twinning based metal strengthening: reduction of the free slip distance (Hall‐Petch effect), transformation of glissile to sessile dislocations (Basinski mechanism), and, additionally, textural softening due to reorientation of the material to a favourable orientation for slip. The rel…