Materials Literature
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Abstract Self‐condensing vinyl hyperbranched polymerization (SCVP) with A‐B* type monomer is simulated applying Monte Carlo method using 3 d bond fluctuation lattice model in three‐dimensional space. The kinetics of SCVP with zero active energy of reaction is studied in detail. It is found that the maximal number–aver…
Systematic examinations for new phases on the quasi-binary section AgX−Ag 2 Q (with X = halide and Q = chalcogenide) led to the exploration of the three new compounds Ag 19 Te 6 Br 7, Ag 19 Te 6 Br 5.4 I 1.6, and Ag 19 Te 5 SeBr 7 . All of them crystallize in new structure types with rigid anion and highly disordered…
The effects of extracellular matrix (ECM) proteins and cationic polymers on the adhesion and proliferation of rat islet cells, RIN-5F cells, were investigated. ECM proteins of laminin, fibronectin, vitronectin, type I collagen, type II collagen, and type IV collagen, and cationic polyelectrolytes of poly(L-lysine) and…
Abstract Makrofol DE 1‐1 CC polycarbonate samples were exposed to alpha particles of initial energies at levels between 5.1 and 34 MeV. The modifications induced in polycarbonate samples due to the alpha particle irradiation have been studied through different characterization techniques such as X‐ray diffraction (XRD…
By observing with low-energy electron microscopy whether individual alumina islands grow or shrink for different substrate temperatures and ${\mathrm{O}}_{2}$ pressures, we determine the stability of thin oxide layers on the NiAl(110) surface. At each temperature, a well-defined ${\mathrm{O}}_{2}$ pressure exists wher…
A simple, geometry controllable method is presented for fabricating multiscale hierarchical polymer structures that exhibit superhydrophobic water-repellent properties with near-zero sliding angle over a large area. A UV-assisted micromolding technique is used to create a microtexture with an ultraviolet (UV)-curable…
Industrial ethanol fermentation is a non-sterile process and contaminant microorganisms can lead to a decrease in industrial productivity and significant economic loss. Nowadays, some distilleries in Northeastern Brazil deal with bacterial contamination by decreasing must pH and adding bactericides. Alternatively, con…
By employing molecular dynamics computer simulations, the phase behavior of systems of rodlike particles with varying degree of internal flexibility has been traced from the perfectly rigid rod limit till very flexible particles, and from the high density region till the isotropic phase. From the perfectly rigid rod l…
Uptake and release processes of various fluorescent rhodamine dyes and antitumor drugs to/from an ordered mesoporous silica film are investigated by means of UV/Vis absorption and fluorescence spectroscopies. The pores in the 160 nm-thick silica film strongly withdraw the dyes from water, thus allowing the storage of…
Abstract Poly(ether‐ester‐amide)s (PEEAs) based on poly(tetramethylene oxide) and tetra‐amide segments were synthesized by a solution/melt polymerization. The tetra‐amide segments (T6A6T) were based on adipic acid (A), terephthalic acid (T), and hexamethylene diamine (6), and were synthesized prior to the polymerizati…
We report the site-specific synthesis of mixed valence TiIV-O-FeII complexes within the pores of ordered mesoporous silica (SBA-15). By using 6-di- tert-butylpyridine as the selective activator of tripodally linked TiIV-OH groups of Ti-grafted SBA-15, the FeCl2.4H2O complexes reacted selectively with the nucleophilic…
Abstract This article described the temperature dependence of electrical resistivity for carbon nanofiber (CNF)/unsaturated polyester resin (UPR) nanocomposites prepared by a solvent evaporation method. It was found that the CNF/UPR nanocomposites had quite low electrical percolation threshold due to CNFs having a lar…
Abstract Crystalline proteins may offer superior properties for drug delivery compared to standard protein formulations such as aqueous solutions or amorphous precipitated lyophilisates. In this study, a new approach using biocompatible, hydrophilic, substituted alkylammonium‐based ionic liquids (ILs) as additives for…
Abstract This article presents the effects of the die geometry on the expansion ratio of extruded polystyrene foams blown with CO 2 . Three groups of interchangeable filamentary dies were used to represent the die parameters. The experimental results reveal that a strong relationship exists between the expansion ratio…
Abstract The water equilibrium concentration has been determined for three aromatic polysulfones differentiated essentially by the sulfone concentration, in the 0–0.9 activity range, at temperatures of 50, 60, and 70°C, using a dynamic vapor sorption apparatus. In all the cases, Henry's law was obeyed. The correspondi…
The alpha-helical coiled coil is a structurally simple protein oligomerization or interaction motif consisting of two or more alpha helices twisted into a supercoiled bundle. Coiled coils can differ in their stoichiometry, helix orientation, and axial alignment. Because of the near degeneracy of many of these variants…
Abstract Fourier transform infrared (FTIR) spectroscopy was used to reveal intermolecular interactions between carbon dioxide (CO 2 ) and the carbonyl groups of poly( L ‐lactide) (PLLA), poly( D,L ‐lactide) (PDLLA), and poly(ε‐caprolactone) (PCL). After exposing polymer films to high pressure CO 2 , the wave number of…
Abstract A high‐melt‐strength polypropylene (HMSPP) was prepared using a twin‐screw reactive extruder from a commercial isotactic polypropylene through two stages, first, maleic anhydride is grafted to polypropylene to obtain a maleic anhydride‐grafted polypropylene (PP‐g‐MA), and then the grafted polymer is reacted w…
Abstract Novel biobased polyurethanes were synthesized from rubber seed oil (RSO), a renewable resource. The RSO monoglyceride, together with xylene and hexamethylene diisocyanate (HMDI), was employed to synthesize the desired urethane‐based prepolymer with isocyanate (NCO)‐terminated end groups followed by curing. Th…
Abstract Cyanate ester (CE) resin was modified with renewable resource, i.e. epoxidized soybean oil (ESO), and the effects of ESO content on the curing co‐reaction, morphologies, water absorption behaviors, thermal and mechanical properties of CE/ESO blends were studied. Differential scanning calorimeter (DSC), Fourie…