Materials Literature
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D,L-3-Methylglycolide (MG) was synthesized via two step reactions with a good yield (42%). It was successfully polymerized in bulk with stannous octoate as a catalyst at 110 °C. The effects of the polymerization time and catalyst concentration on the molecular weight and monomer conversion were studied. Poly(D,L-lacti…
The influences of the applied stress and the stress concentration factor (Kt) on hydrogen embrittlement were investigated in the commercial JIS SCM440 steel with the tensile strength of 1403 MPa. The applied stress was changed from 0.33 times to 0.72 times the tensile strength of the notched specimen, while the Kt was…
Some polyimide films based on cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA) and aromatic diamines were synthesized to investigate their temperature resistance and percent transmission of light. The preparations of CBDA were investigated; they produced almost 10 times the yield of CBDA in comparison to yields…
The reaction of Se(SiMe3)2 with mixtures of copper(I) chloride and indium(III) chloride in the presence of phosphine ligands PR3 (R = organic group) yielded the new clusters [Cu6In8Se13Cl4(PPh3)6(C4H8O)] 1, [Cu6In8Se13Cl4(PnPr2Ph)12] 2 and [Cu11In15Se16(SePh)24(PPh3)4] 3. The molecular structures of 1, 2 and 3 have be…
The formation of host-guest complexes between C60 and polybenzyl ether dendrimers with different central cores (phloroglucinol, meso-tetraphenylporphyrin, cyclotriveratrylene) has been investigated in organic solvents by means of 13C-NMR and UV-Vis spectroscopy. The interior of the dendrimers with a phloroglucinol cor…
Incorporation of 9(10H)-acridone as a chromophore into a seven-coordinate chelating ligand allows observation of sensitised luminescence from the europium(III) complex, even with excitation wavelengths greater than 410 nm.
A novel blend of polypropylene (PP) with Chlorella, a natural microalga, was synthesized successfully by a melt-mixing method with maleic anhydride-modified polypropylene (MPP) as a compatibilizer. The adhesion of hydrophobic PP to hydrophilic Chlorella is based on the formation of chemical bonds between the maleic an…
Glassy carbon electrodes were electrochemically modified by an anodization/cathodization procedure in aqueous H 2 SO 4 . Depending on the anodization time, the active‐layer thickness could be controlled from less than a micrometer to nearly 100 μm. Electrochemical impedance measurements indicated that the capacitance…
Isotactic polypropylene (iPP) has been crystallized in the presence of talc under the quiescent state and shear flow of injection molding. The resulting morphology has been investigated by means of polarizing microscopy, transmission electron microscopy, and wide angle X-ray diffraction. In the quiescent state, the iP…
The formation and thermal stability of the catalytically important anhydrous acids H3PM12O40 (M = Mo,W,V), of the corresponding anhydrides PM12O38.5 and of a novel first time isolated trihydrate H3PW12O40·3H2O have been studied by high temperature X-ray diffraction (XRD) and thermogravimetry (TG). The corresponding cr…
The packing of beta-1,4-glucopyranose chains has been modeled to further elaborate the molecular structures of native cellulose microfibrils. A chain pairing procedure was implemented that evaluates the optimal interchain distance and energy for all possible settings of the two chains. Starting with a rigid model of a…
The adsorption of myoglobin (MGB) onto various kinds of colloidal synthetic hydroxyapatite [X10(PO4)6(OH)2, noted CaHap, SrHap and CaSrHap for X=Ca, Sr and Ca+Sr, respectively] particles was investigated at 15°C in a 1×10−4 mol dm−3 KCl solution of pH 6.0. The adsorption rate of MGB onto CaHap was comparable to that o…
An X-ray crystal structure determination reveals that 1,4,8,11,15,18,22,25-octaisopentylphthalocyanine adopts a saddle conformation, a geometry which shows modified spectroscopic properties and reduced photostability relative to planar ring structures.
XPS, temperature programmed reduction (TPR) and FTIR spectroscopy of adsorbed CO and the hydrogenation of crotonaldehyde were used to study the nature of the surface species present for two Cu–TiO2 catalysts (2 and 5% Cu) subjected to reduction in hydrogen at 523, 623 and 723 K. Despite TPR and XPS evidence for comple…
To chemically attach β-cyclodextrin (CD) molecules to cotton cellulose, N-methylol-acrylamide (NMA) was used to synthesize a CD containing monomer, which was then grafted onto cellulose fibers. Initiation of the cotton cellulose backbone with ceric ion before the addition of acrylamidomethyl cyclodextrin (CD-NMA) mono…
The improvement in the oxygen-barrier properties of poly(ethylene terephthalate) (PET) by orientation and heat setting was examined. Orientation was carried out at 65 °C by constrained uniaxial stretching to a draw ratio of about 4. Heat setting was performed at temperatures from 90 to 160 °C with the specimen taut. O…
The char-forming characteristics of wool are well known but have been little studied during recent years, although flame-retardant activity may be associated with enhanced char formation in many cases. Recently, intumescent flame-retardants have been shown to react synergistically with flame-retarded cellulosic fibres…
Subjecting illuminated n‐type silicon wafers to anodic bias in an HF containing electrolyte results in the formation of macropores under certain conditions. In this paper the formation of randomly nucleated macropores is studied as a function of the applied potential, the temperature, and the doping levels of the samp…
The mechanisms of reactions are investigated between polyvinyl chloride and oxides such as ZnO, Fe2O3 and ZnFe2O4 under inert gas atmosphere at high temperature with combined thermogravimetry-mass spectrometry (TG-MS) technique. From the experiments under a constant heating rate of 40 K/min, the following results are…
We report variations in the coercivity of CoFe/sub 2/O/sub 4/ nanoparticles as a function of particle size, temperature and light intensity. For 30 nm particles, this change in was 2300 Oe at 10 K, 120 Oe at 170 K, for a light intensity of under 2 milliwatts. The remanent magnetization was nearly unchanged by illumina…