Materials Literature
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The preparation of poly(dimethylsiloxane)s having part of the siloxane units substituted with a model organic thioether was investigated. The sulfur group was generated by the ene−thiol addition to the vinyl function bound to silicon. Two synthetic routes to this copolymer were compared (i) one-step kinetically contro…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSegmental Relaxation in Poly(dimethylsiloxane)C. M. Roland and K. L. NagiView Author Information Naval Research Laboratory, Washington, D.C. 20375-5320Cite this: Macromolecules 1996, 29, 17, 5747–5750Publication Date (Web):August 12, 1996Publication History Received12 January 1…
Designing basketball uniforms for female athletes is a challenge for soft goods manufacturers. Data were collected from 503 female collegiate basketball players concerning body cathexis, body form, garment fit satisfaction, uniform design preferences and demographic characteristics. Of the three areas of the body (upp…
By incorporating high molecular weight poly(styrenesulfonate) as the counter-ion in poly(aniline) films good electroactivity and stability can be achieved for the resulting molecular composite in buffered aqueous solution at pH 7. For short times (e.g. 30 min) in pH 7 solution the redox process is reversible and repro…
The second-order nonlinear optical response of amine and phenol/ether derivatives ( 1 − 8 ) has been evaluated using experimental and theoretical techniques. Electric-field-induced second-harmonic generation (EFISH) measurements establish that N -phenyl substitution of 4-nitroaniline ( 1 ) produces a greater increase…
Highly faceted, regular, lathlike lamellar single crystals of syndiotactic polypropylene (s-PP) fractions have been investigated through transmission electron microscopy (TEM), atomic force microscopy (AFM), and electron diffraction (ED). Single crystals of s-PP over 1 μm in size can be grown from the melt in thin fil…
The electrochemistry and spectroelectrochemistry of (TPPBr(x)())FeCl (TPPBr(x)() is the dianion of beta-brominated-pyrrole tetraphenylporphyrin and x = 0-8) were examined in PhCN containing tetra-n-butylammonium perchlorate (TBAP) as supporting electrolyte. Each compound undergoes two reversible to quasireversible one…
Following the characterization of polyoxypregnane esters and esterified glycosides from the less polar extracts of Leptadenia hastata, 34 new congeners have been isolated from the more polar extracts. They possess sarcostin or deacetylmetaplexigenin as the aglycons and acetyl, benzoyl, cinnamoyl, nicotinoyl, and m -hy…
In this study, a tubular hybrid vascular tissue composed of vascular cells and collagen was implanted as a venous substitute, and its remodeling process was histologically investigated. First, a hybrid medial tissue was prepared by pouring a cold mixed solution of canine jugular smooth muscle cells (SMCs) and Type I c…
In the Leibler description of copolymer systems containing only two kinds of monomers, the state of the system is described by one order parameter, ψ( r ), representing the deviation of the local composition from the space-averaged value. The Landau free energy is expanded up to fourth order in powers of ψ( r ) and su…
Freeze-fracture electron microscopy was used to characterize the microstructure of a novel multivesicular liposome (MVL) currently under investigation as a depot-type drug delivery vehicle. The interior of the MVL includes bilayer-enclosed, water-filled compartments surrounded by an encapsulating outer membrane. The c…
The in vitro antibacterial effect of the combination of various polyoxometalates with beta-lactam antibiotics on methicillin-resistant Staphylococcus aureus (MRSA) strains is investigated by the use of both the National Committee for Clinical Laboratory Standards (NCCLS) disk method and the agar dilution method. Keggi…
Galena oxidation was investigated by AFM in acetate buffer under potentiostatic control and by photoelectron spectroscopy on potentiostatically pretreated specimens. At +236 mV (SHE) formation of sulfur protrusions could be observed with AFM. XPS showed the formation of elemental sulfur to start at potentials more ano…
29 Si NMR is used to quantify the polymerization kinetics of silicon alkoxide intermediates in acidic sol−gel processes well before gelation. Reaction conditions are chosen (a) to minimize interference by hydrolysis kinetics and differing degrees of hydrolysis and (b) to investigate the possibility of single-step copo…
Surfaces of medical grade silicone rubber (Q7-4750, Dow Corning) were modified by repeated (six times) RF plasma treatments using various discharge gases: oxygen, argon, carbon dioxide, and ammonia. The treated samples were stored for a period of 3 months in ambient air, water, or liquid nitrogen. Subsequently, the te…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEfficient Photochemical Oxygenation of Cyclohexene with Water as an Oxygen Donor Sensitized by Dimethoxy-Coordinated Tetraphenylporphyrinatoantimony(V)Tsutomu Shiragami, Kyouichi Kubomura, Daisuke Ishibashi, and Haruo InoueView Author Information Department of Industri…
The title compound [NEt4]3[WOS3(CuI)3(µ2-I)]· H2O has been synthesized by the reaction of (NH4)2WO2S2, CuI and Et4NI. Single-crystal X-ray diffraction data show that the anionic cluster [WOS3(CuI)3(µ2-I)]3– has a half-open cage structure. Non-linear optical (NLO) properties of the cluster were investigated with a puls…
The specific epithet of Halobacterium salinarium is a grammatically incorrect form for the genitive of salinae (salt works). Therefore, we propose that the name of the type species of the genus Halobacterium should be changed to Halobacterium salinarum nom. corrig. This species includes strains often designated Haloba…
The rheology and microstructure of aqueous dispersions containing Mg–Al layered double hydroxides (LDHs) are considered. The thickening and gelling of such dispersions can be controlled by the addition of electrolyte or, within a certain composition range, by the application of shear. In addition to electrolyte and LD…
A new series of bis-macrocyclic bola-amphiphiles were prepared, and their transport activities in vesicle and planar bilayer membranes were evaluated. From vesicle experiments, the apparent kinetic order in transporter indicates that aggregates are the kinetically active species. Step-conductance changes observed in p…