Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The NMR spectra of polyamide 46/polyamide 6I copolymers, which were obtained by reaction in the molten sate, are studied. Using 13 C NMR, a physical blend of polyamide 46 and polyamide 6I and a polyamide 46/polyamide 6I copolymer could be discriminated. Four kinds of diad sequences are observed in the carbonyl resonan…
The adsorption of different ethoxysilanes on Al was studied. It was established that during polymolecular adsorption of ethoxysilanes from the vapor phase on aluminum the first monolayer is adsorbed irreversibly with adsorption van der Waals bonds between silane molecules and the aluminum surface. The covalent bonding…
Chain-folded single crystals of the five even−even nylons 4 4, 6 4, 8 4, 10 4, and 12 4 were grown from solution and their structures and morphologies studied using transmission electron microscopy, both imaging and diffraction. Sedimented mats were examined using X-ray diffraction. All these nylons have room temperat…
In catalysis, it has been suggested that the addition of CeO2 and other rare-earth metal oxides to alumina can stabilize the surface area and the spinel transition phases of the alumina support used in automotive catalysis. As this structural stabilizing effect by CeO2 was recently observed to occur only to a very lim…
A new family of nonionic water-soluble lutetium bisphthalocyanines and a copper monophthalocyanine have been synthesized and characterized. Optical absorption determinations demonstrate aggregation processes in water. Optical microscopy, differential scanning calorimetry (DSC), and X-ray diffraction measurements have…
Absorption and emission spectra of monomers and dimers of [tetramethoxytetrakis(octyloxy)phthalocyaninato]silicon have been measured as a function of solvent and concentration. In contrast to the monomer, the fluorescence of the dimer is shifted to lower energy by about 4000 cm -1, and the emission quantum yield is re…
The addition of calcium (1.23−9.73 mg/g of protein) during neutralization of isoelectric precipitate modified the thermal behavior of soybean protein isolates. In the samples that did not undergo thermal treatment, the calcium content increase caused an increase in thermal stability, especially in the 11S fraction, bu…
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…