Materials Literature
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A novel spirobichroman unit containing dietheramine, 6,6′-bis(4-aminophenoxy)-4,4,4′,4′,7,7′-hexamethyl-2,2′-spirobichroman (3), was prepared by the nucleophilic substitution of 6,6′-dihydroxy-4,4,4′,4′,7,7′-hexamethyl-2,2′-spirobichroman with p-chloronitrobenzene in the presence of K2CO3 followed by hydrazine catalyt…
Drastic behavior changes occur for power transducers using PZT type of ceramics. A better characterization under high excitations is then required for piezoelectric materials Indeed, characteristic nonlinear behaviors such as resonance frequency shift with hysteresis effect and overtones generation are observed experi…
The influence of physical aging on the dielectric α-relaxation of three amorphous polymers is investigated by means of time domain dielectric experiments. It is found that the dielectric relaxation behavior in a, “isostructural” state out-of-equilibrium can be well described by the Kohlrausch−Williams−Watts (KWW) func…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTBiodegradation of Cross-Linked Chitosan Gels by a MicroorganismHiroyuki Yamamoto and Masato AmaikeView Author Information Institute of High Polymer Research, Faculty of Textile Science and Technology, Shinshu University, Ueda 386, JapanCite this: Macromolecules 1997, 30, 13, 39…
To investigate if corrosion inhibition by aerobic biofilms is a general phenomenon, carbon steel (SAE 1018) coupons were exposed to a complex liquid medium (Luria-Bertani) and seawater-mimicking medium (VNSS) containing fifteen different pure-culture bacterial suspensions representing seven genera. Compared to sterile…
The influence of titanium surface properties on in vitro adsorption isotherms of fibronectin, promotion of Staphylococcus aureus adhesion, and binding of a monoclonal antibody to the cell-binding domain of fibronectin was examined. Treatments producing different surface roughness were applied to a single side of comme…
A review of the feasibility of imaging receptors was made using published literature. The results suggest that there is no physical limitation to imaging the classical biochemical receptors using currently available compounds. Limitations occur because of biological constraints. These constraints are those of delivery…
The thermal decomposition of a synthetic hydrotalcite-type (HT) sample [Mg 0.71 Al 0.29 (OH) 2 (CO 3 ) 0.145 · m H 2 O] has been investigated by neutron diffraction using a programmed temperature control facility. The evolution from HT phase to mixed oxide leading ultimately to the partial segregation of a spinel phas…
The stability of sandwich panels subjected to the simultaneous action of a uniform temperature and a uniaxial compression is considered. At elevated temperatures, the buckling load can be increased by using shape memory alloy (SMA) fibers in resin sleeves embedded within the core, at the midplane of the sandwich panel…
Abstract Multiple viscoelastic properties were determined for poly(methyl methacrylate) in the context of examining experimental limitations on deriving other properties from these measurements, specifically time dependent bulk modulus behavior. By means of master curves for uniaxial extension on plate and cylinder sp…
The relaxor ferroelectric lead zinc niobate (Pb(Zn 1/3 Nb 2/3 )O 3 ) has been intensively investigated, because of its large dielectric and piezoelectric properties for applications in actuators and transducers. In this study, the in‐situ behavior of the domains in Pb(Zn 1/3 Nb 2/3 )O 3 single crystals has been observ…
Abstract Isotactic polypropylene (PP) resin was doped with pimelic acid, sodium pimelate, and calcium pimelate to stimulate the growth of hexagonal crystalline polypropylene (β‐PP). The doped resin was crystallized in a differential scanning calorimeter (DSC) and during compression molding and injection molding. The e…
The reduction of [Mn(II)-salophen] derivatives [salophen = N, N ‘-ethylenebis(salicylideneaminato) dianion] led to the formation of C−C bridged dimers. Such C−C bonds function as two electron shuttles in electron-transfer reactions. The reduction of [Mn(salophen)(THF)] 2 ( 1 ) and [Mn(3,5-Bu t 4 salophen)(THF)] 2 ( 3…
Nickel oxide thin films were deposited by reactive sputtering in a 20% oxygen/argon atmosphere for use as oxygen evolution catalysts in the photoelectrochemical production of hydrogen. The optical properties of the films were also characterized to evaluate their application as window layers. The polycrystalline films…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis, Solution and Solid State Structures, and Aqueous Chemistry of an Unstable Polyperoxo Polyoxometalate: [P2W12(NbO2)6O56]12-Deborah A. Judd, Qin Chen, Charles F. Campana, and Craig L. HillView Author Information Department of Chemistry, Emory University Atlant…
The energies of strained two-member and three-member rings of ${\mathrm{SiO}}_{4}$ tetrahedra are calculated using models based on continuous ${\mathrm{SiO}}_{2}$ networks. These rings are considered to form highly reactive ``defect'' centers in vitreous ${\mathrm{SiO}}_{2}$ and at its surface. The calculations are ba…
This work takes a micromechanical approach to fabric tensile modeling. The entire uniaxial tensile stress-strain behavior of the fabric is modeled from the constitutive yarn properties (tensile, bending, flattening, and consolidation behavior) and the original fabric geometry. Techniques for measuring these yarn prope…
Tetragonal zirconia solid solutions were prepared by the additions of ceria, titania, germania, and cassiterite into 2‐mol%‐Y 2 O 3 ‐stabilized t ‐ZrO 2 (2Y‐TZP), and the effect of the dopant size on the changes in the Raman spectra of t ‐ZrO 2 was investigated. The frequencies of the Raman modes that were associated…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorBonding at Symmetric Polymer/Polymer Interfaces below the Glass Transition TemperatureYuri M. Boiko and Robert E. Prud'hommeView Author Information Centre de recherche en sciences et ingénierie des macromolécules, Chemistry Department,…
Abstract The synthesis of new functionalised macromers containing perfluoropolyether structures (PFPE) is reported. They are obtained by reaction of bis‐CH 2 OH terminated PFPE with isocyanato‐ethyl methacrylate (EIM), giving rise to the formation of perfluoropolyether bisurethane methacrylate (PFEUMA) oligomers. The…