Materials Literature
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Abstract Crosslinking in AFR700B polyimide was studied using several techniques. Crosslinking could not be detected using Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). Swelling in n‐methyl pyrrolidone (NMP) showed network formation occurs at cure temperatures ≥325°C (617°F…
Abstract tert‐Butanolate von Germanium(II), Zinn(II) und Blei(II) der Formel {M[OC(CH 3 ) 3 ] 2 } n (M Ge, n = 2; M Sn, n = 2; M Pb, n = 3) sowie die entsprechenden Heterometallalkoxide M′M 2 [O‐C(CH 3 ) 3 ] 6 (M Ge, M′ Sr, Ba; M Sn, M′ Ca, Sr, Ba; M Pb, M′ Ca, Ba) wurden in einem CVD‐Prozeß (Chemic…
Plasma-IAD with the APS (advanced plasma source) has been introduced into the market in 1992. Up to now this technique is used worldwide in almost 100 coating systems. A large number of different layer systems has been investigated in R&D and applied in production. For ophthalmic applications plasma-IAD with the APS i…
Anionic random and block copolymerization of isobornyl methacrylate (IBMA) and methyl methacrylate (MMA) has been studied in THF at −78 °C by using (1,1-diphenyl-3,3-dimethylbutyl)lithium (DDBLi) as initiator in the presence of LiCl. The random copolymerization of MMA and IBMA has also been carried out at 0 °C, all th…
All articles of this category The Horner-Wadsworth-Emmons reaction of the first, third and fourth generation of aldehyde terminated dendrimers 1-[Gn] ( n =1: 6 CHO, n =3:24 CHO, n =4:48 CHO groups, respectively) with phosphonates unsubstituted at the carbon α to the phosphoryl group 2a-i affords in moderate yield dend…
The influence of p -acetoxyacetanilide (PAA) as an additive in the surrounding paracetamol solution was investigated during growth and dissolution of paracetamol crystals. The different crystal faces of paracetamol, {110}, {201̄}, and {001}, exhibited two different mechanisms of interaction with the additive. Accordin…
We have developed a technique using laser-light scattering for monitoring and controlling precipitate formation during pulsed-laser deposition of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ (YBCO) films. By laser ablating a stoichiometric YBCO target under o…
Studies on the synthesis, preliminary in vivo biological activity, singlet oxygen and fluorescence yields of a dimeric porphyrin (D1) are described. The pharmacokinetic behavior and photodynamic properties of the dimer D1 were examined in Balb/c mice bearing an MS-2 fibrosarcoma. Compound D1 shows a high selectivity f…
Scanning electron microscopy (SEM) and x-ray microanalysis (EDS) were used to investigate stress corrosion cracking (SCC) in plain tinplate food cans, product discoloration, filiform corrosion, pitting/perforation corrosion, and loss of coating adhesion in enameled food cans. Intergranular SCC of uncoated tinplate occ…
Thin solid SnO 2 and SnO 2 / Mo (10%, 2:1 and 1:1) films with an ion‐storage capacity of 20 to 30 mC/cm 2 and weakly expressed cathodic electrochromism were deposited using the dip‐coating technique. The films were deposited from peroxo sols prepared by reacting SnCl 2 ⋅ 2 H 2 O and a metallic molybdenum precursor wit…
A novel grayscale-memory ferroelectric liquid crystal device with polymer dispersion has been studied. The ferroelectric liquid crystal molecules are stabilized by a low-concentration doped polymer, which induces an enormous number of small liquid crystal domains with different threshold voltages for bistable switchin…
Tensile and fracture tests were conducted at 20° and 1200°C on a ceramic‐matrix composite that was composed of an alumina (Al 2 O 3 ) matrix that was bidirectionally reinforced with 37 vol% silicon carbide (SiC) Nicalon fibers. The composite presented nonlinear behavior at both temperatures; however, the strength and…
The propeptides of bacterial subtilisin BPN' and Carlsberg were synthesized to investigate their inhibitory function on the enzymes. Kinetically, pro-BPN' inhibits the proteolytic activities of subtilisin BPN' and Carlsberg separately in a slow binding mode. Pro-Carlsberg behaves as a typical rapid equilibrium competi…
The optimal layup with least weight or cost for a symmetrically laminated plate subject to a buckling load is determined using a hybrid composite construction. A hybrid construction provides further tailoring capabilities and can meet the weight, cost and strength constraints while a non-hybrid construction may fail t…
Magnetic structure is studied for several π-networks of graphite-like structures with edge and/or topological defects using the tight-binding model (the Hückel model). Zigzag-edged graphite have edge states, which form a partly flat band at the Fermi energy. Short range repulsion (the Hubbard U) is enough to induce hu…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSalt-Controlled Lamellar Spacing in Ionically End-Capped Symmetric Diblock CopolymersVolker Schädler and Ulrich WiesnerView Author Information Max-Planck-Institut für Polymerforschung, Postfach 3148, D-55021 Mainz, Germany Cite this…
Abstract Scanning force microscopy (SFM) was used to study the lamellar morphology of α and β spherulites in bulk intruded isotactic polypropylene (iPP) samples deformed under shear stress. The iPP specimens were sheared at a constant shear rate at room temperature. Just beyond yielding, at a shear strain level of 0.5…
Crystallization-temperature ( T c ) dependence of the probability of the presence of stacking faults, p, in the solution-grown β-form single crystal of syndiotactic polystyrene (s-PS) was analyzed on the basis of the growth theory of the polymer crystal. By comparing the experimentally obtained T c dependence of p wit…
The present study examines photoinduced electron transfer within self-assembled complexes between cytochrome c and either free base uroporphyrin (URO) or free base tetrakis(4-carboxyphenyl)porphyrin (4CP). In both systems, complexation of the porphyrin to the protein results in bathochromic shifts in the absorption ba…
Existing theory cannot account for the experimentally-observed thermal boundary resistance between deposited layers and substrates at room temperature. This is due to microstructural disorder in the deposited film within tens of nanometers of the interface. This work develops a model for the resulting thermal resistan…