Materials Literature
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Abstract The annealing at 373 K of ultrastrong, gel‐spun polyethylene (PE) has been studied. At this temperature, the fibers show no significant shrinkage. Still, a significant decrease in the mechanical properties is observed. The fibers have been analyzed with differential scanning calorimetry (DSC), temperature‐mod…
Abstract Silicic acid produced from sodium metasilicate hydrate and metallocene polyethylene–octene elastomer (POE) were chosen as the ceramic precursor and the continuous phase, respectively, for preparation of new hybrids by an in situ sol–gel process. To obtain a better hybrid, the acrylic acid‐grafted polyethylene…
Antimony silicates doped with a metal, (M)x,ySb2-xSi2-yO7 (M=W, Ti, Nb), were studied for the removal of the key radionuclides 85Sr, 134Cs, and 57Co from nuclear waste solutions. Emphasis was given to the removal of radionuclides from acidic effluents for which no efficient commercial exchangers are available. Initial…
Abstract The preparation of microcellular polystyrene (PS), lightly sulfonated polystyrene (SPS), zinc‐neutralized lightly sulfonated polystyrene (ZnSPS), and blends of PS/SPS and PS/ZnSPS via supercritical CO 2 was carried out with the pressure‐quench process. Both higher foaming temperature and lower pressure result…
Polymer crystallization from a uniaxially stretched amorphous state was investigated by molecular dynamics simulation using a realistic molecular model of poly(ethylene). Simulations for crystallization were performed at temperatures between 280 and 350 K. Structure formations to crystalline states having lower symmet…
Molecular weight (M) dependence of the equilibrium melting temperature of isotactic polypropylene (iPP) with high tacticity ([mmmm]=99.6%) was studied. Four fractionated iPPs with M n=23×103, 64×103, 94×103, and 263×103 were used. was obtained by using an improved method based on the Gibbs–Thomson plot proposed in pre…
The present study focuses on the creation of a framework and methodology to span three orders of magnitude in scale with interconnected models that relate performance of single wall carbon nanotubes (SWCN) at the nanometer scale to a nanoarray, nanowire, and microfiber with self-similar geometries. The geometry chosen…
Abstract The variations in the molecular orientation of uniaxially drawn rigid‐rod polyimide films were systematically characterized in all three dimensions with polarized attenuated total reflection/Fourier transform infrared spectroscopy. The second‐order orientation coefficients were directly deduced from the aniso…
An aluminium single crystal with [110] initially parallel to the tensile axis and (1&1macr;1) initially parallel to the front face of the crystal was elongated by 30%. Macroscopic deformation bands were visible on the broad face of the crystal after deformation. To explore the deformation–band characteristics, crystal…
This paper reports the formation of novel hydrogen-bonded assemblies 1(3).CA obtained upon mixing cyanuric acid (CA) with melamine derivatives 1, in which two of the three possible H-bonding arrays have been blocked. The four components are held together by 9 hydrogen bonds and form a rigid planar structure in which a…
10.1021/ma025662i
We report the preparation and solution properties of metal-free [1b(H(2))] and cobalt [1c(Co)] porphyrazines (pz's), where three pyrroles are functionalized with a S(2)O(3) crown ether for metal-ion binding and the fourth pyrrole is appended with two long-chain alcohols (bis((11-hydroxyundecyl)thio)) for potential use…
Segmented conducting polymers based upon a calix[4]arene scaffold are reported. The cone conformation creates a zigzag orientation of the polymer segments. Their acid-dependent conductivities are similar to the strong pH conductivity dependence of polyaniline which is said to be acid dopable. On the other hand, they h…
Abstract Polycarboxylic acids have been used as nonformaldehyde durable press finishing agents for cotton fabrics. Previously, we found that itaconic acid (IA) polymerized in situ on cotton fabric and also in an aqueous solution in the presence of a K 2 S 2 O 8 /NaH 2 PO 2 initiation system. Both poly(itaconic acid) (…
Three new germanate solids, ASU-19, ASU-20-DAPe, and ASU-20-DACH, have been synthesized under hydrothermal conditions using respectively 1,4-diaminobutane (DAB), 1,5-diaminopentane (DAPe), and 1,4-diaminocyclohexane (DACH) as bases. The structures of ASU-19 and ASU-20-DACH have been characterized by single-crystal X-r…
High quality semiconducting famatinite (Cu3SbS4) nanofibers and tetradrite (Cu12Sb4S13) nanoflakes have been selectively synthesized through mild hydrothermal and solvothermal synthesis routes, respectively. The morphology and phase of the products can be successfully controlled by choosing appropriate reaction media…
Amorphous poly(l-lactide) (PLLA) was annealed in two different ways: amorphous samples were heated at a given temperature to induce crystallization (one-step annealing); and amorphous samples were first crystallized at a low temperature and subsequently annealed at a higher temperature than the crystallization tempera…
In revisiting the original argument of de Gennes and Hervet [J. Phys. (Paris) 44, L351 (1983)]] leading to "hollow-core" dendrimers, we show that a self-consistent application of their model leads to the "filled-core" model first elucidated by Lescanec and Muthukumar [Macromolecules 23, 2280 (1990)]]. The monomer dens…
A simple thermodynamic model for determining the wetting free energy of a small, sessile drop spreading on a solid surface has been derived by assuming that the process can be treated as adsorption. According to the model, free energies are expected to be small for large contact angles and increase exponentially as co…
Mono-urea serine derivatives with low molecular weights were prepared in one step and show remarkable self-assembling and gelation properties in water.