Materials Literature
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This work describes the effect of the addition of EPDM to polypropylene on the mechanical performance of EPDM/PP blends prepared in different composition ranges and mixing conditions, and evaluates the effect on the mechanical properties when controlled degraded polypropylene is added to these blends as a third compon…
Keggin-type heteropolyacids (water-soluble H 3 PMo 12 O 40, H 4 PMo 11 VO 40, and H 8 PMo 10 VCuO 40 and water-insoluble K 3 PMo 12 O 40 and H 3 - x Cs x PMo 12 O 40, x = 1, 2, 2.5, 3) deposited on highly oriented pyrolytic graphite (HOPG) surfaces were successfully imaged by scanning tunneling microscopy (STM). All o…
The esterification of aqueous lactic acid solution with methanol and its reverse reaction catalyzed by acidic cation exchange resins in the H+ form were carried out in a batch system. The inhibiting effects of water and methanol on the resins were evaluated. The experimental data were correlated by a kinetic model tha…
The thiazole orange derivative, TO-PRO-3, and its dimeric analogue, TOTO-3, bind strongly to both double- and single-stranded DNA. Both the bound and the free dye undergo efficient nonphotochemical hole burning. From the structure of the hole burned and the fluorescence line-narrowed spectra, it is concluded that ther…
Crack growth in silica optical fibers was measured directly in a wide range of crack velocities d a/ d t (10 −13 < d a /d t < 10 −5 m/s) by improving our previous method. The slope in log‐log plots of the crack velocity versus the stress intensity factor data was revealed to increase with the crack velocity, e.g…
Advanced ceramic materials can be synthesized and processed using a large variety of different techniques. Synthesis and processing methods of oxide and non-oxide ceramic materials is reviewed with emphasis on solution techniques and high-temperature gas phase and condensed phase syntheses. Net-shape methods such as c…
The reaction between salicylaldehyde, diethylenetriamine and lanthanide(III)(Ln3+) nitrates in refluxing methanol produced new acyclic dimeric Schiff-base compounds [{LnL7(NO3)}2](H2L7 is the 2 : 1 Schiff-base condensation product of salicylaldehyde and diethylenetriamine) in which the coupled Ln3+ ions are bridged by…
The dark‐field diffraction contrast of helical nanotubes (NTs) is shown to be asymmetric when an NT is tilted at appropriate angle with respect to the incident electron beam. This phenomenon was used for the chirality determination of multi‐shell NTs observed in MoS 2 layered compound. Both kinds of NT — helical and n…
The mechanisms of the molecular and dissociative adsorption of formic acid HCOOH on a ZnO(101̄0) surface were investigated by means of the ab initio molecular orbital method using a Zn 4 O 4 cluster embedded in an electrostatic field represented by 464 point charges at the crystal ZnO lattice positions. cis -Formic ac…
Stress, strain, and optical birefringence were measured for cross-linked natural rubber in compression and tension over a range of strains. The experimental data were compared to the constrained-junction theory (Flory, P. J.; Erman, B. Macromolecules 1982, 15, 800) and to the constrained-chain theory (Kloczkowski, A.;…
The phase behavior in ternary blends of polystyrene (PS), poly(methyl methacrylate) (PMMA), and poly(styrene- co -methyl methacrylate) has been determined as a function of sequence distribution at 150 °C. Two copolymers were investigated which have comparable compositions (48−50 mol % methyl methacrylate monomer units…
This paper examines the effects of hydration and plasticization on relaxation in cellulose acetate as revealed in the collated data from a number of techniques which include NMR, differential scanning calorimetry, dynamic mechanical thermal analysis and dielectric spectroscopy, the latter over an extended range of fre…
Hydrothermal synthesis of tetraborate, B 4 O 5 (OH) 4 2 -, -pillared hydrotalcites was investigated, and an efficient way of preparing them was found. The structures of the pillared materials were characterized using a combination of techniques such as powder X-ray diffraction, FT-IR, 11 B and 27 Al MAS NMR, DTA/TGA,…
Bicontinuous microemulsions made from oil, water, and surfactants were examined as substitutes for organic solvents in carbon−carbon bond-forming reactions. Conjugated additions of primary alkyl iodides 3a − c to 2-cyclohexen-1-one ( 4 ) to give 3-alkyl cyclohexanones 5a − c and cyclization of 2-(4-bromobutyl)-2-cyclo…
The first phthalocyanine derivative decorated with peripheral tetrathiafulvalene (TTF) units has been synthesized. The synthetic design strategy and the derivative's spectroscopic and electrochemical characterization are described. It is noted that the tendency of phthalocyanine units to assemble in solution is not pr…
Colloidal nanosheets of an exfoliated titanate start to be reassembled from a novel associated pair, accommodating an interlayer water cluster of > 100 Å thickness, to produce a restacked layer structure.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFormation of an Unstable Photodimer from 9-Anthracenecarboxylic Acid in the Solid StateYoshikatsu Ito and Haruo FujitaView Author Information Department of Synthetic Chemistry & Biological Chemistry, Faculty of Engineering, Kyoto University, Kyoto 606, Japan Cite this: J. Org.…
The polyethylene for the study was ultra-high molecular weight polyethylene (UHMW-PE) reactor powder extrusion drawn to a low draw ratio (DR) of ∼6 (first-stage draw). The structural change during the second-stage tensile draw of the extrudate has been studied above the static melting point by real-time wide-angle X-r…
The influence of a poly(styrene- graft -ethylene oxide) (P(S- g -EO)) copolymer on poly(2,6-dimethyl- p -phenylene oxide)/poly(methyl methacrylate) (PPO/PMMA) blends was studied by a number of different techniques in order to characterize the properties of the interphase. Scanning electron microscopy shows that the co…
The potentially toxic diatom Pseudonitzschia pungens f. multiseries was grown on different sources of nitrogen in batch cultures. Ammonium did not support growth at concentrations >200 μM, and even lowered the growth rate, when it was supplied in addition to growth-saturating nitrate concentrations. This seemed to be…