Materials Literature
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Abstract A study has been made of the mechanical, thermal, and morpholigical characteristics of melt‐crystallized isotactic polypropylene containing high levels of the β or pseudohexagonal crystalline form. Different levels of β‐form crystallinity were produced in the polymer by blending in low levels of quinacridone…
Dipolar interactions between silver particles arranged on a square two-dimensional grating give rise to characteristic features in the wavelength dependence of surface-enhanced Raman scattering from adsorbed molecules. The interactions produce two pronounced effects: first, they shift and broaden the plasmon resonance…
An homogeneous stirred reactor designed for kinetic studies of hydrocarbon oxidation in the intermediate temperature range is described. The originality of this reactor lies in its ability to operate under pressure up to 10 atm ( approximately 1 MPa). The design of the injectors makes it possible to move a thermocoupl…
The chapter on thermophysical properties, curtailed from that in the first edition, should be different by giving uniformly the latest internationally-agreed property data and by giving information for modern materials: e.g., Table 65, reproduced from the 1950's, includes in its "selected nonmetals" none of the polyme…
The detrimental aging phenomenon observed in ZrO 2 ‐Y 2 O 3 materials, which causes tetragonal ZrO 2 to transform to its monoclinic structure at temperatures between 150 and 400°C, was investigated with respect to the gaseous aging environment and the Y 2 O 3 and SiO 2 content of the material. It is shown that the agi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymers. 2. Infrared temperature studies of nylon 11Daniel J. Skrovanek, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1986, 19, 3, 699–705Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published in…
Examination of the porhyrins from the viewpoint of the “annulene chemist” has led to the discovery of the novel, simple porphin isomer porphycene 2. The path from conception to the synthesis of the molecule was surprisingly short. 2 is formed as a stable compound upon McMurry reaction of 1.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocalization of benzene in sodium-Y-zeolite by powder neutron diffractionA. N. Fitch, H. Jobic, and A. RenouprezCite this: J. Phys. Chem. 1986, 90, 7, 1311–1318Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986h…
The results are given of an investigation of the luminescence and stimulated emission spectra of powder phosphors of the Na 5 La 1- x Nd x (MoO 4 ) 4 composition prepared by the method of solidstate synthesis. Stimulated emission of neodymium was observed under the influence of strong pumping with laser pulses of 30-n…
The reaction of Dy2O3 or Tb4O7 with Nd15Fe77B8 powder during the sintering increases the coercivity of the sintered magnets. These oxides are reduced to metal during the sintering process, resulting in magnets with properties similar to those prepared from the Nd13.5Dy1.5Fe77B8 alloy.
The positions of atoms in icosahedral crystals are shown to correspond to arrangements of three-dimensional hypersurfaces in six-dimensional periodic lattices. The six-dimensional space-group symmetry allows for crystals which cannot be formed by space-filling decorated tilings (quasicrystals). Structures with continu…
Volume 1 of this outstanding resource concentrates on safety and environmental concerns in the manufacture and use of resins, and thoroughly discusses theories of degradation, plasticization, solvation, and stabilization.
Abstract The rotating bed plasma reactor described here permits uniform surface modification of relatively large amounts of powder materials. Scale‐up to even larger batches of solids appears to be feasible. Some preliminary experimental data on the plasma surface modification of polymer powders have been presented. T…
Calculations are presented for the collective plasmon modes of a superlattice consisting of two-dimensional electron gas layers separated by media of alternating thickness and/or dielectric constant. The theory is developed for bulk plasmon modes in an infinite superlattice, and for bulk and surface modes in a semi-in…
Abstract Blending of nylon‐6 and nylon‐66 was carried out by coextrusion in the whole range of compositions with particular emphasis on small amounts of one polymer in the other. Most significant improvement in properties is achieved at low blend compositions in which the minor component remains amorphous while severe…
It has been found that the thermoacidophilic archaebacterium, Thermoplasma acidophilum , can metabolise glucose via a modified Entner‐Doudoroff pathway involving non‐phosphorylated intermediates. Pyruvate and glyceraldehyde are the first products, the glyceraldehyde then being further metabolised to a second molecule…
(CH3NH3)3Sb2Cl9 single crystals are grown which appear to be isomorphous with Cs3Sb2Cl9 crystals of β-modification. They are characterized by the space group Pmcn with the lattice constants: a = 0.7920(5), b = 1.3334(11), and c = 1.966(2) nm. In the crystal one can distinguish the poly-anionic (Sb2Cl9)3- stacks direct…
Olivine-like structures of NaGdGeO4, NaYGeO4, and NaLuGeO4 germanates are refined from precise X-ray diffractometry data. Acentric and center-symmetrical variants of structure models are checked. The obtained experimental data gives an opportunity to establish center-symmetrical Fedorov Pnma group. Interatomic distanc…
The process of isothermal compositional ordering in the Pb2ScNbO6 ferroelectric and Pb2InNbO6 antiferroelectric is studied. Variation in the degree of the compositional long-range order is brought about by annealing at high temperature and the subsequent quenching and is registered by its effect on dielectric characte…
Crystals of KTiOPO4, RbTiOPO4, and TlTiOPO4 are grown, studied, and found to be ferroelectrics with Curie points of 934, 789, and 581 °C, respectively. The phase transitions are of displacive type and nearly of second order. These crystals have also a high ionic conductivity and can exhibit a strong low-frequency diel…