Materials Literature
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Abstract The evaluation of filler dispersion in compounding machines is an important part of their design. Calcium carbonate–filled polypropylene (PP) was used as a model compound to study filler dispersion. The evolution of dispersion was followed in a twin‐screw extruder where several types of mixing sections were e…
The intended function of barbed needle punching is to transport loose fibers through the thickness of the web to consolidate them into a cohesive fabric. Needle punching inevitably causes some fibers to weaken and even break. Parts II and III will deal with the experimental determination of these changes caused by nee…
Two extremely long lived metastable states (SI and SII) can be accessed by irradiation with light in the blue-green spectral range at temperatures below 200 K in Cs(2)[Ru(ox)(NO)Cl(3)], [Ni(cyclam)][Ru(ox)(NO)Cl(3)].3H(2)O, and [Ru(terpy)(NO)(OH)Cl][PF(6)]. The crystal structures of the ground states of the oxalate-co…
The genus Frustulia was found to be an abundant and important component of the attached algal community in a suite of dilute, poorly buffered, and acidic ponds situated in the Ocala National Forest in north-central Florida. Six species were found in the study, including Frustulia krammeri Lange-Bertalot & Metzelti…
The concentration distribution and microstructure of NiTi shape memory alloys produced in vacuum induction furnaces operating at high and medium frequencies are compared with those of materials melted in vacuum resistance furnaces. The production procedure consisted of charging pure metals into a graphite crucible; ra…
The viscosity of peraluminous Na 2 O-Al 2 O 3 -SiO 2 melts of constant SiO 2 content is essentially independent of Al 2 O 3 content. The addition of more Al 3+ to the peraluminous melts does not result in a decrease in viscosity. This finding indicates that the Al 3+ in these melts does not enter the structure as a vi…
The diatom genus Haslea Simonsen was erected to accommodate spindle-shaped valves with acute apices, convex margins, straight raphe and approximate central pores, inconspicuous areas, and transapical striae crossed at a right angle by a longitudinal pattern with a slit apically oriented in each areola. Investigations…
In the last two decades, a variety of techniques for signal-to-noise ratio (SNR) estimation in scanning electron microscope (SEM) images have been proposed. However, these techniques can be divided into two groups: first, SNR estimators of good accuracy, but based on impractical assumptions; second, estimators based o…
Many problems related to the quality of protective coatings for more sophisticated applications can be solved on the basis of the wettability of their surfaces measurements. The equilibrium (static) or dynamic contact angle (CA) of solids can be measured and the sessile drop method or Wilhelmy method are usually appli…
Gelatin microspheres were prepared by water/oil emulsion polymerization and by cross-linking with glutaraldehyde. For the microsphere preparation procedure, two different gelatin (5 or 10% w/v) and three different glutaraldehyde (5, 0.5 or 0.1% v/v) concentrations were used. The influence of preparation compositions o…
Abstract Summary: The phase‐morphology inversion in two blend systems of polystyrene/poly(methyl methacrylate) (PS/PMMA) and polystyrene/poly( ε ‐caprolactone) (PS/PCL) has been studied after their thin films were prepared on glass substrates by spin‐coating from a co‐solvent tetrahydrofuran (THF). Phase‐contrast micr…
properties of natural rubber (NR) / linear low-density polyethylene (LLDPE) blends have been investigated. The blends were prepared by melt blending in a Haake Rheomix at 140°C, 15 min mixing time and a rotor speed of 50 rpm. Fillers were incorporated into the blends for 10-60 vol.%. The mechanical and physical proper…
Abstract Summary: In this paper, a mathematical model describing olefin polymerization with metallocene catalysts is presented. It is an improvement of a previous model, the “particle growth model” (PGM) proposed by, among others, one of the authors of the present work and derives from the so‐called “multigrane model”…
Abstract Thermodynamic properties of an iron(II) spin crossover complex [Fe(2-pic)3]Cl2·H2O (2-pic: 2-picolylamine or 2-aminomethylpyridine), for which an unusually large thermal hysteresis with a width of [Tc(↑) − Tc(↓) = 91 K] in its spin-state transition has been observed by 57Fe Mössbauer spectroscopy, were invest…
Isolation of microstructural and microchemical effects on irradiation assisted stress corrosion cracking (IASCC) was attempted by means of low-dose high-temperature neutron irradiation in a material test reactor to get better understanding on IASCC. Microstructure, grain boundary segregation, hardness and SCC suscepti…
We present a holographic lens with novel features recorded in an azopolymer film. Two holographic modulations, bulk birefringence and surface relief, are induced in the medium at the same time. The resultant holographic element has two focal planes, and the polarization of light in the focal points depends on the pola…
This research was conducted to clarify the membrane formation mechanism of cross-linked polyurea microcapsules by phase separation method, especially the role of polymeric surfactant, such as poly(ethylene-alt-maleic anhydride) (poly(E-MA)) at the interface of O/W emulsion. It was found that poly(E-MA) was necessary f…
Abstract This paper reports the influence of moisture and internal partial discharges on the degradation of metal oxide varistors in high‐voltage surge arresters. Both factors cause an increase in the varistor current under the operating voltage. This phenomenon is dangerous and can cause a total outage of the metal o…
Five homologous series of 4-(4-substituted phenylazo)phenyl 4-alkoxybenzoates (Ia–e) were prepared in which the substituent (X) was taken from CH3O, CH3, Cl, NO2, and CN, while, within each homologous series, the length of the terminal alkoxy group varied between 6 and 16 carbon atoms. Compounds prepared were characte…
Alkylarenes were catalytically and selectively oxidized to the corresponding benzylic acetates and carbonyl products by nitrate salts in acetic acid in the presence of Keggin type molybdenum-based heteropolyacids, H(3+)(x)()PV(x)()Mo(12)(-)(x)()O(40) (x = 0-2). H(5)PV(2)Mo(10)O(40) was especially effective. For methyl…