Materials Literature
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(γ-Aminopropyl)triethoxysilane (APTES) and simpler molecules having at least one common function with APTES (i.e., propylamine and mono-, di-, or triethoxyalkylsilane) were adsorbed at the silica/heptane interface at 25 °C. The hydrolysis of ethoxy functions by surface water is observed only for APTES, which stresses…
Adiabatic heat capacity measurements were made on triphenylphosphite, molecular formula C 18 H 15 O 3 P, between 140 and 335 K. The results confirm the existence of a phase which is intermediate in stability between the undercooled liquid and the crystal phase. This phase, called the glacial phase, was recently report…
Article Definitions of terms relating to degradation, aging, and related chemical transformations of polymers (IUPAC Recommendations 1996) was published on January 1, 1996 in the journal Pure and Applied Chemistry (volume 68, issue 12).
Photoreduction of [SbV(tpp)(OH)2]+(tpp = dianion of 5,10,15,20-tetraphenylporphyrin) yields either the metastable π-radical anion [SbV(tpp˙–)(OH)2] or the two-electron reduced[SbIII(tpp)]+ complex; product formation can be channelled in the desired direction by an appropriate choice of the reaction medium and dioxygen…
According to the Rietveld refinement, Ca2CrNbO6 and Sr2CrNbO6 have been found to be monoclinic with a= 5.4195 (1)Å, b= 5.4907 (1)Å, c= 7.7073 (2)Å, and cubic with a= 7.8732 (1)Å(Fmtext-decoration:overline3m, No. 225), respectively. Under atmospheric pressure, Ba2CrNbO6 crystallizes into an 8H hexagonal structure with…
The MCM-41 molecular sieve, a member of the M41S family, is prepared for the first time in the presence of fluoride ions; the mesophase obtained from surfactant : silicon molar ratios in the range 0.2–2:1 is always hexagonal.
The distribution of the magnetization in planar ferrite devices is nonuniform due to the non-uniformity of the demagnetizing field. A method for calculating the local demagnetizing tensor for arbitrary 3-dimensional shapes, using the Finite Difference Method (FDM), is developed. The sample is discretized into rectangu…
Sulfated zirconia catalysts were prepared using a sol−gel method with zirconium n -propoxide as the alkoxide precursor and a water/alkoxide ratio of 40. The strength of the sulfuric acid solution used to activate the zirconia was found to be an important variable in the synthesis of the superacid catalyst. A maximum b…
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In this article we describe the synthesis, characterisation and phase behaviour of some phasmidic liquid crystals containing the diaza 18-crown-6 macrocyclic core. Seven compounds were synthesised, five tetracatenar and two hexacatenar. The terminal alkoxy chains were varied in length from ten to eighteen carbon atoms…
The complex bis(acetylacetonato)platinum(II) is inactive in the dark but forms a highly reactive hydrosilation catalyst upon irradiation with near-UV light. Vinyldimethylsilane is polymerized with it. Poly[(dimethyl)vinylsilane] is the major product; minor components consist of the dimers 1,1,2,3,3-pentamethyl-1,3-dis…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorRing-Opening Copolymerization of (R)-β-Butyrolactone with Cyclic Carbonates: New Biodegradable Poly(ester carbonate)sYoji Hori, Yoshiharu Gonda, Yoko Takahashi, and Toshimitsu HagiwaraView Author Information Central Research Laboratory,…
Poly( l -lysine) was reacted with p -phenylazobenzenesulfonyl chloride to give polypeptides containing azobenzene units linked to the Lys chains by means of sulfonamide functions. The azo-modified polymers were soluble in hexafluoro-2-propanol (HFP), in which they exhibited photochromism due to the trans/cis photoisom…
We have developed the WPI cavitational materials process for the production of phase-pure, nanostructured materials. Hydrodynamic cavitation is generated mechanically using a high-pressure fluid system. The method begins with a precipitant stream that experiences a large pressure drop (21 000 psi ambient) across a pat…
Extracorporeal therapies based on membrane hybrid liver support devices using primary hepatocytes are an interesting approach to the treatment of acute hepatic failure. In such devices, semipermeable polymeric membranes are effectively used as immunoselective barriers between a patient's blood and the xenocytes in ord…
The kinetics of the solid-state phase transformation of form β to γ of sulfanilamide in powdered samples have been investigated using energy-dispersive X-ray diffraction (EDXRD) combined with synchrotron radiation. The β to γ transformation which is relatively fast has been followed in real time, courtesy of the high…
Two homologous series of polymers based on poly(vinyl chloride) (PVC) have been prepared by chemical reduction of PVC with lithium aluminum tetrahydride and by chemical substitution of PVC with sodium benzenethiolate. The general formula for both series of copolymers is (CH 2 CHCl) m −(CH 2 CHX) n, with X = H or SC 6…
The synthesis and structural characterization of three mixed-valence π-cation radical derivatives of (octaethylporphinato)metal(II) species, [M(OEP • /2 )] 2 +, (M = Ni, Cu, and (Zn,H 2 )), are reported. The species thus have the same formal ring oxidation level as the photooxidized special pair of photosynthetic reac…
Simple conditions were discovered to afford tripyrranes by reaction of 2,5-bis(α-hydroxymethyl)furan or 2,5-bis(α-hydroxy-α-phenylmethyl)thiophene with excess pyrrole in the presence of acid catalyst. Stepwise synthesis of porphyrins with core-ligand modification and synthesis of meso-tetraarylporphyrins bearing two d…
Behaviour: the contribution of micromechanical approaches to the modelling of inelastic behaviour of polycrystals micromechanisms of plasticity under multilaxial cyclic loading stacking fault energy and cyclic hardening FOC solid solutions undermultiaxial nonproportional loadings yield surfaces and dislocation structu…