Materials Literature
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Abstract The composites of polyaniline (PAn) and zinc sulfonated ethylene–propylene–diene rubber (EPDM) ionomer were made by polymerization of aniline in the presence of the ionomer by using a direct, one‐step in situ emulsion polymerization technique. The ionomers were prepared by sulfonation of EPDM rubber with acet…
Abstract The morphology of a polypropylene/polyethylene (PP/PE) blend and a maleic anhydride modified PP and PE (PPg/PEg) blend was studied. The initial morphology, at the extruder die, after the melt blending into a twin‐screw extruder, was first characterized. Then, the evolution of this initial morphology was follo…
Abstract Synthesis of crosslinked chitosan using γ irradiation in the presence of carbon tetrachloride as a sensitizer is carried out. The resultant crosslinked product, which is yellow in color, is characterized by elemental analysis, which shows the presence of chlorine. Crosslinked chitosan on hydrolysis with alkal…
Nanocrystalline PbSe films were grown on GaAs(100) and on the As face of GaAs(111) substrates using chemical solution deposition. The microstructure of the films was found to be strongly affected by the deposition temperature over a surprisingly narrow temperature range. In PbSe deposited on GaAs(100), gradual increas…
Up to four link types are found between the stereocilia of chick vestibular hair bundles: tip links, horizontal top connectors, shaft connectors and ankle links. A fifth type, the kinocilial link, couples the hair bundle to the kinocilium. Brownian-motion microinterferometry was used to study the mechanical properties…
Abstract Poly(styrene‐ co ‐maleic anhydride) (SMA)/silica and poly(styrene‐ co ‐acrylonitrile) (SAN)/silica hybrids were prepared via a sol‐gel route by using silicic acid oligomer (SAO) from water glass in this article. This convenient route is different from the traditional one from tetraethoxysilane (TEOS). The pol…
Abstract Epiclon [3a,4,5,7a‐tetrahydro‐7‐methyl‐5‐(tetrahydro‐2,5‐dioxo‐3‐furanyl)‐1,3‐isobenzofurandione] or [5‐(2,5‐dioxotetrahydrofurfuryl)‐3‐methyl‐3‐cyclohexyl‐1,2‐dicarboxylic acid anhydride] (1) was reacted with L ‐isoleucine (2) in acetic acid and the resulting imide acid (3) was obtained in high yield. The di…
Abstract Side‐by‐side bicomponent meltblown fiber webs were developed on REICOFIL® bicomponent (bico) meltblown line at The University of Tennessee's Textiles and Nonwovens Development Center (TANDEC), using polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), poly…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPoly(methyl methacrylate)-graft-poly- [bis(trifluoroethoxy)phosphazene] Copolymers: Synthesis, Characterization, and Effects of Polyphosphazene IncorporationHarry R. Allcock, Eric S. Powell, Andrew E. Maher, and Erik B. BerdaView Author Information Department of Chemistry, The…
Abstract Silk fibroin/alginate blend sponges were examined through IR spectroscopy, X‐ray diffractometry, and differential scanning calorimetry to determine the structural changes of silk fibroin. The effects of fibroin/alginate blend ratios on the physical and mechanical properties were investigated to discover the f…
[reaction: see text] Modulation of the fluorescein fluorescence in the presence of spiropyran and ferric ion by light was observed. Such fluorescence modulation was due to the low oxidation potential of complex MC.Fe(2+), which made the electron transfer from MC.Fe(2+) to Flu(+)()(*)() thermodynamically favorable. As…
Abstract The effect of the stearic acid coated fillers and their geometry on the shear/dynamic viscosity and complex viscosity has been investigated using polypropylene (PP) compounds filled with stearic acid uncoated and coated talc, calcite, and mixed talc/calcite particles. The viscosity was measured over a wide ra…
This article reviews recent advances in research of the dendrimer synthesis in connection with the design, synthesis and reaction of photoresponsive dendrimers. Dendrimers with photoreversible stilbene cores undergo mutual cis–trans isomerization in organic solvents to give photostationary state mixture of cis and tra…
A series of polyurethane elastomers containing aromatic azobenzene chromophore in the hard segment was synthesized by a one-step method. AFM surface study showed that particles on the order of 100 nm to several micrometers appeared after annealing the polymer films. Birefringence was induced in these polymer elastomer…
Aberration-corrected atomic number contrast scanning transmission electron microscopy (Z-STEM) was used to study CdSe nanocrystals prepared using different surfactants. With an optimal probe size of 0.8 Å, unprecedentedly detailed images of the nanocrystal's lattice structure and surface morphology were obtained. This…
We have studied the dehydration process of formic acid on a TiO 2 (110) surface by using first-principles theoretical calculations. Formic acid dissociatively adsorbs to form formate and hydroxyl. It turns out that simple decomposition processes of the formate on the stoichiometric surface are energetically unfavorabl…
Template synthesis is a powerful method for the preparation of nanoscale materials with specific size and shape. We describe the template synthesis of polypyrrole nanowires and CdS nanoparticles within monolithic nanoporous polymer templates prepared from ordered block copolymer precursors. SAXS measurements confirmed…
Two thermodynamic models have been developed to interpret the preferential accumulation or exclusion of solutes in the vicinity of biopolymer surface and the effects of these solutes on protein processes. The local-bulk partitioning model treats solute (and water) as partitioning between the region at/or near the prot…
Abstract Glycidyl azide polymers (GAPs), containing different diol units, were prepared by treating the corresponding poly(epichlorohydrin)s (PECHs) with sodium azide in DMF solvent at 110°C for 8–10 h. The poly(epichlorohydrin)s containing different diol units were synthesized by the polymerization of epichlorohydrin…
Hierarchical features of the thermal unfolding-refolding structural transition of hen egg white lysozyme (HEWL) have been studied in the temperature range from 13 to 84 degrees C by using high-resolution wide-angle X-ray scattering (WAXS) measurements at a third-generation synchrotron source. We have gathered high-sta…