Materials Literature
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The temperature dependences of the second moments M2 of the proton magnetic resonance absorption spectra and of the proton spin–lattice relaxation times T1 of perovskite layer compounds (CnH2n+1NH3)2CdCl4 with n=1–3 and (NH3– (CH2)n–NH3) CdCl4 with n=2−5 have been studied together with the frequency dispersion of T1.…
Infrared reflection spectra and Raman spectra at several temperatures between 2 K and 350 K have been observed for triglycine sulphate and the isomorphous compound triglycine selenate. A complete group theoretical enumeration of the phonon modes is given and the observed frequencies have been tabulated for different t…
A sample of p-Hexyl-Oxy-Benzylidne-p'-Amino-2-Chloro-Propyle-Cinnamate, Chiral liquid crystal, is oriented in the ferroelectric smectic C-phase by a square wave field ± E; its permanent polarization orients itself from + P to — P in a time adjustable with E. This time is chosen to obtain an induced transient current,…
The lecture provides a survey on the actual status of the heat and light stabilization of PVC with special emphasis on the mode of action of the stabilizers. In the first part a brief treatment of the most important facts of the thermal degradation of PVC are given, followed by a discussion of some proved specific fun…
X-ray diffraction experiments of a single crystal of magnetite at 84 K were carried out to investigate the crystal symmetry below the transition temperature. A new lattice deformation which makes the crystal symmetry lower than rhom-bolaedral was clarified. The extra reflections which appear in the low temperature pha…
The static dielectric constants of the following compounds have been measured as functions of temperature in their nematic and isotropic phases: (i) 4'-n-alkyl-4-cyanobiphenyls, (ii) tras-p-n-alkoxy-α-methyl p'-cyanophenyl cinnamates and (iii) CBOOA. All these exhibit a very large positive dielectric anisotropy becaus…
Freeze-fracture electron microscopy has been used to examine defect structures such as confocal domains, screw dislocations, disclinations, and walls in lamellar phospholipid phases containing known amounts of water (from about 5 to 65% by weight). In a concurrent study (Costello and Gulik-Krzywicki 1976) all samples…
Non-linear behaviors of nematic-isotropic transition temperatures and the appearance of the “solid-like” phase found in the mixtures between MBBA and 4-cyano-4-n-pentylbiphenyl (CPB)1 are now found to be quite general among many other nematogens. The cyano-group containing nematogens do not have to be biphenyl derivat…
Pitting potentials have been measured and some gravimetric testing has been carried out on a series of experimental austenitic stainless steels with varying chromium, molybdenum and nitrogen contents. All three of these elements were found to contribute to the resistance to the initiation of pitting corrosion, and syn…
We extend the generalized van der Waals (GVDW) theory to fluids of anisotropic molecules interacting through angle-dependent potentials which can be broken up into strong short-ranged repulsions and weak long-ranged attractions. This approach provides a description of the gas–liquid phase transition in which correspon…
Rotary replication has been adapted to freeze-etching and evaluated using T4 polyheads, erythrocyte ghosts, and chloroplast membranes. Conventional electron microscopy, electron diffraction, and optical diffraction and filtering indicate that platinum-carbon rotary replication renders radially symmetrical contrast and…
Abstract Uni‐ and biaxial stretching of various polymer films has been studied under well‐defined conditions of temperature and elongational strain rate in order to determine the relationship between stress and recoverable strain for both modes of deformation. The extent of molecular orientation has been investigated…
The alkali halides are very susceptible to radiation damage in the halogen sublattice when exposed to ionizing radiation, the primary products being F-centres and interstitial halogen atoms (H-centres). Experimental observations have shown that clustering of the H-centres leads to the formation and growth of perfect i…
Description This book covers analysis of the crack arrest problem, numerical analysis methods for fast fracture and crack arrest, crack arrest determination using the double cantilever beam specimen, and experimental methods for fast fracture and crack arrest in 24 papers.
Amorphous thin films of carbon have been prepared by the decomposition of acetylene in a radio frequency glow discharge. The specimens were deposited on substrates held at temperatures T d between 400 and 650 K. Measurements of the optical absorption show that glow discharge carbon has an optical gap of the order of 2…
SYNOPSIS Transmission electron microscopy of suitably prepared specimens makes possible the direct observation of the multiphase morphology of block and graft copolymers, and polymer blends. Transmission specimens less than 1000 Å in thickness are made by ultramicrotome techniques. Several staining methods are now in…
A device capable of converting directly the kinetic energy of charged particles into electrical energy is considered. The device differs from earlier ones (such as Post's periodic focus electrostatic direct convertor) in that it makes use of the space charge repulsion in a high density charged particle beam. The beam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Polymerization of α,α,α',α'-Tetrachloro-2-cyano-p-xylyleneShouji Iwatsuki and Kimio InoueCite this: Macromolecules 1977, 10, 1, 58–63Publication Date (Print):January 1, 1977Publication History Published online1 May 2002Published inissue 1 January 1977https://…
"Fundamental aspects of nuclear reactor fuel elements." International Metals Reviews, 22(1), pp. 258–259
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopolymer Chain Statistics. The Pseudo-Stereochemical Equilibrium Approach within the Continuum of Rotational States. The Unperturbed Dimensions of Atactic PolypropyleneG. Allegra and S. BrücknerCite this: Macromolecules 1977, 10, 1, 106–113Publication Date (Print):January 1…