Materials Literature
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The effect of the interchange reactions of poly(ethylene terephthalate) (PET) on its molecular weight distribution (MWD) was analyzed using a Monte Carlo simulation method. Three kinds of motions, which correspond to the direct ester(SINGLEBOND)ester interchange reaction, alcoholysis, and internal alcoholysis in polye…
Cross-like rigid multipodes consisting of a spyro center unit and arms containing one or two phenyl units designed for molecular reinforcement effects are considered. The expectation based on theoretical considerations was that such multipodes would display an enhanced solubility both in low molar mass solvents and in…
Cavitation bubbles were generated by the 193 nm argon fluoride excimer laser delivered with a specially designed tip into absorbing NaCl solution. The dynamics of bubble formation and collapse have been studied using fast flash photomicrography. The bubble dimensions were measured at different time delays as a functio…
An atomic level analysis of the effect of crystal defects such as free surfaces, dislocations and grain boundaries on the martensitic transformation in bcc Ti, Ti - 15V (atom %) and Ti - 25V (atom %) has been carried out using the embedded atom method (EAM) interatomic potentials to quantify the atomic interactions an…
We present non-equilibrium molecular dynamics (NEMD) simulations of planar Couette flow for models for normal (n-butane) and isomeric butane (i-butane) molecules. Two of the three classes of models used here are collapsed atom models while the third class is an atomistically detailed model. In general agreement with p…
Image processing has been used as a tool to determine the trash content in cotton webs. The experiments showed that in particular seed coat particles are difficult to separate from the cotton during cleaning processes whereas neps, leaf and wooden fragments can easily be removed. A correlation between the number of se…
L’augmentation de la vitesse de refroidissement sur la table de sortie du train à bandes doit permettre de produire des aciers de résistance à partir d’une composition chimique moins chère et de développer de nouvelles qualités d’acier.
The effect of discharge treatments such as low-temperanire plasma treatment, atmospheric lowtemperature plasma treatment and sputter-etching on the surface characteristics of different textile fibres and polymeric materials has been investigated. The plasma treatment causes mainly chemical modification and increases w…
Control of supramolecular organization by weak noncovalent interactions is demonstrated in a series of crystalline materials based on functionalized porphyrin building blocks. The monomeric units associate via metal-ligand binding, hydrogen-bonding and halogen-halogen interactions into pseudo-rigid polymeric arrangeme…
Some of the 4-arylmethyleneamino-TEMPO (2,2,6,6-tetramethyl-piperidin-1-oxyl) radical crystals showed an intermolecular ferromagnetic interaction. The X-ray structure analyses were performed on 4-arylmethyleneamino-TEMPO crystals (aryl = phenyl, p-chlorophenyl, p-biphenyl, p-phenoxyphenyl, p-bromophenyl, 3,5-dichlorop…
Abstract Die Darstellung von Li 2 PtH 2 gelang aus Li 5 Pt 2 H 9 durch eine Abbaureaktion bei 220°C in einer Argonatmosphäre. Röntgenographische Untersuchungen an pulverförmigen Proben und elastische Neutronenbeugungsexperimente an der deuterierten Verbindung führten zur vollständigen Strukturaufklärung. Li 2 PtH 2 kr…
Abstract Interpretation of K-Ar determinations of the apparent age of crystallization of diagenetic potassic layer silicates should take into account the current ideas concerning the smectite to illite conversion of clay minerals. These minerals are the major K-bearing neogenic phases in sedimentary rocks and, therefo…
Abstract A discussion of the electronic energy bands and lattice dynamics of pure and lithium‐intercalated InSe is presented. After a review of the structure of this material and its polytypes, experimental results on both optical absorption and photoluminescence are compared for the pure and lithiumintercalated cases…
Ti-13Nb-13Zr (Ti-13-13TM) is a new titanium alloy developed for medical implant applications. In the oxygen diffusion hardened condition, Ti-13-13 and titanium alloys which possess zirconium, are hardenable at temperatures of 400 to 600°C with the end result being a passive, mechanically stable, abrasion resistant oxi…
Abstract Concurrent measurements of transmitted polarized light intensity and recording of the phenomenon of crystallization through polarized optical microscopy have resolved some of the controversies on the bulk crystallization behavior of poly(aryl ether ether ketone) (PEEK). The process of bulk crystallization was…
SUMMARY The brown alga Sphacelaria rigidula Kützing synthesizes cellulose microfibrils as determined by CBH I‐gold labeling. The cellulose microfibrils are thin, ribbon‐like structures with a uniform thickness of about 2.6 nm and a variable width in the range of 2.6‐30 nm. Some striations appear along the longitudinal…
Abstract New fluoropolyether polyolic resins are presented suitable to be cured with conventional hardeners as polyisocyanates or melamines. These resins are prepared by addition of fluoropolyether macrodiols (Fomblin® ZDOLTX) of various molecular weights to isophorone diisocyanate (IPDI) to give oligomeric NCO‐termin…
The isothermal section of the Ti‐B‐C system at 1600°C for compositions in and adjacent to the TiB 2 ‐TiC x ‐Ti 3 B 4 compatibility triangle was revised to reflect the fact that Ti 3 B 4 is an equilibrium phase in this system. Lattice parameter measurements together with image analyses of SEM micrographs of densifled c…
Abstract The properties of ultralow‐density polyethylenes (ULDPE) have been studied using temperature rising elution fractionation (TREF) as both an analytical and preparative process. TREF was employed to determine the short chain branch distribution and to fractionate the polymer into fractions that enabled further…
Layered polysilane synthesized according to a new recipe was characterized mainly by photoluminescence (PL) measurement. The PL spectrum of the as-prepared sample had a broad peak at 2.0 eV. The PL peak of a sample annealed at 300°C was also at 2.0 eV, and its PL intensity was several times greater than that of the as…