Materials Literature
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Abstract Rubber elasticity may be operationally defined as very large deformability with essentially complete recoverability. In order for a material to exhibit this type of elasticity, three molecular conditions must be met: (1) the material must consist of polymeric chains, (2) the chains must be joined into a netwo…
Shrink-resist finishing of wool fabrics using aqueous based polymer systems is usually carried out using an energy intensive pad → dry → heat cure technique. This paper describes fabric shrink-resist finishing using the Bunte salt terminated polyether, Lankrolan SHR3 (Diamond Shamrock), by a simple pad → store (room t…
Electronic conductivity in Fe‐doped β‐alumina containing up to 40 w/o Fe has been measured using four techniques: ( i ) two‐electrode a‐c (complex impedance), ( ii ) two‐electrode d‐c, ( iii ) four‐electrode d‐c, and ( iv ) Wagner polarization using electrodes. The first three techniques gave consistent results while…
Abstract The influence of ammonium polyphosphate (APP) on the smoke emission of poly(acrylonitrile) (PAN) has been examined, and its mechanism of action as a smoke suppressant agent has been investigated. Smoke density and corresponding residual char data, as a function of temperature, were obtained in order to charac…
(1982). THE KINETICS OF THIXOTROPIC BEHAVIOUR IN CLAY/KAOLIN AQUEOUS SUSPENSIONS. Chemical Engineering Communications: Vol. 17, No. 1-6, pp. 13-22.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeactivation by carbon of nickel, nickel-ruthenium, and nickel-molybdenum methanation catalystsA. Douglas Moeller and Calvin H. BartholomewCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 3, 390–397Publication Date (Print):September 1, 1982Publication History Published o…
Abstract The viscosity data available for four anionically polymerized polystyrenes ranging in molecular weight from 1100 to 47,000 for the temperature range T g to T g + 100°C have been fitted by computer programs to both the Vogel, Fulcher, Tamman, and Hesse (VFTH) equation and to two optimum intersecting Arrhenius…
Abstract X-ray diffraction, optical and microprobe studies of a kaolinized oligoclase—orthoclase—two-mica—granite (Southern Armorican Massif) indicated that low-temperature metasomatism had produced three series of minerals. 1. Partial alteration of muscovite resulted in the formation of ferrous-magnesium-phengite. Bi…
The antisymmetric exchange term (AET) in the exchange spin hamiltonian, d. S1×S2 , can have sizeable effects on the EPR spectra of hetero-dinuclear transition metal complexes. In this paper we review briefly the symmetry aspects of the AET and give a general formulation for its matrix elements for any pair of S 1, S 2…
Abstract Die bei 4,2 K aus dem 121 Sb‐Mößbauer‐Effekt ermittelten Meßparameter der Isomerieverschiebung und der Quadrupolaufspaltung werden für Me 3 Sb(OH) 2 ( I ), Me 3 SbO ( II ) und Ph 3 SbS ( III ) mitgeteilt. Danach ergeben sich für I und II trigonal‐bipyramidale Umgebung der Sb‐Atome mit den Methylgruppen in äqu…
Optical absorption, emission, and excitation spectra, as well as lifetime values, are presented for ${\mathrm{Er}}^{3+}$ ions in RbMg${\mathrm{F}}_{3}$. Previous workers have demonstrated that ${\mathrm{Er}}^{3+}$ ions can reside in a number of different site symmetries in crystalline hosts such as Ca${\mathrm{F}}_{2}…
Time resolved emission measurements of Ln2[Pt(CN)4]3⋅yH2O single crystals (LnCP) at T = 1.9 K are reported. The time dependence of the E⊥c polarized emission of these crystals—with the exception of LuCP—deviates considerably from that of other tetracyanoplatinates (MCP, M≠Ln). The results can be explained assuming an…
Abstract The mechanism by which carbon black reinforces elastomers is one of the most interesting problems of modern technology and still a subject of much speculation. The effect itself was discovered by S. C. Mote of the India-Rubber, Gutta-Percha and Telegraph Works Co. of Silvertown, near London, as a result of an…
ABSTRACT The range of Cladophora glomerata 2 along the east and north shorelines of the Great Lakes and St. Lawrence Seaway extends form just east of Montreal to Thunder Bay on Lake Superior. However, it does not occur at sites sampled in Georgian Bay, the North Channel or eastern Lake Superior. The dominant epiphytes…
The isomer shift observed by means of 155 Gd Mossbauer spectroscopy in intermetallic compounds composed of Gd and one of the metals M=Al, In, Pb, Sn, Zn, Cu, Ni, Co, Fe or Mn was analysed in terms of a model proposed earlier for the 197 Au isomer shift in Au based materials by Miedema and van der Woude (1980). In comb…
Abstract Polymer melt devolatilization (DV) was studied using a single‐screw extruder with extruder RPM and polymer flow‐rate as the key parameters varied. DV efficiency was studied at atmospheric pressure under nitrogen and also at reduced pressure. Preliminary results are applied to current mathematical models.
Influence of electron beam irradiation on the electrical conductivity of I 2 doped trans-(CH) x and its temperature dependence are studied. The electrical conductivity of I 2 doped sample decreases and its activation energy increases with increasing irradiation dose. Imperfections such as chain breaks or cross-linking…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for cobalt(II)-substituted zinc metalloenzymes. 2. Comparisons of the crystal structures of complexes of the type [M(RCOO)2(2-X-Im)2] (Im = imidazole; M = Co, Zn; R = CH3, C2H5, C3H7; X = CH3, C2H5). An unusual type of linkage isomerismWilliam D. Horrocks Jr., Joseph…
A recently burned area near Wallsburg, Wasatch County, Utah, was sampled to determine if differences existed between the soil algal flora of a burned area and that of an adjacent ecologically similar unburned area. Soil samples were cultured and analyzed to determine presence and relative frequency of living algae. Th…
Magnetizations of hexagonal compounds YbFe 2 O 4+ x (polycrystals with x =-0.027, -0.003 and +0.015 and a single crystal with x =+0.03) have been measured in a temperature range between 4.2 K and room temperature. Remanent magnetizations are induced by magnetic fields applied during cooling below about 250 K. Dependen…