Materials Literature
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The distribution of imperfections within the interior of crystals has been studied using ``projection topographs'' which are x-ray diffraction images showing a projection of a slice of crystal and the imperfections in it. Individual dislocations have been observed in single crystals of diamond, silicon, germanium, lit…
Abstract Chemical and clay mineralogical properties of Memphis, Grenada, Calloway and Henry series were determined and related to degree of internal drainage and genesis. Percent base saturation and other chemical data indicated that the more poorly drained profiles were more severely leached than better drained membe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Energy Electron Irradiation of n-HexaneJean H. FutrellCite this: J. Am. Chem. Soc. 1959, 81, 22, 5921–5924Publication Date (Print):November 1, 1959Publication History Published online1 May 2002Published inissue 1 November 1959https://pubs.acs.org/doi/10.1021/ja01531a020…
Abstract The crystal structure of bis(glutaro-nitrilo)copper(I) nitrate has been determined by the two-dimensional Fourier method. It is tetragonal P\bar421c with two formula units in a cell of dimensions: a=8.25±0.01 Å and c=9.71±0.01 Å. The crystal consists of infinite two-dimensional networks of complex ion [Cu(NC–…
The large $p$-type surface conductivity and field-induced surface conductivity of the cleaned germanium surface have been measured over the temperature range 77\ifmmode^\circ\else\textdegree\fi{}-300\ifmmode^\circ\else\textdegree\fi{}K. It is found that the surface conductivit and the field-induced surface conductivit…
Abstract Polymer molecules are characterized by the unique structural feature of being composed of a large number of chain units covalently linked together. Despite this complexity of structure macromolecular systems still retain the ability to exist in different states, a property common to all substances. Two of the…
The purpose of this study was to try to find out why BaTiO 3 (essentially a cubic structure) can consistently be grown from KF solutions as large flat plates when a more equant morphology is expected. It is suggested that the size, shape, and perfection of the platelike “butterfly” twin crystals can be qualitatively r…
Abstract Experimental details are given for the interfacial polycondensation of thirteen polyamides having widely different structures. The method involves the fast, room‐temperature reaction in a two‐phase system between diamines and diacid chlorides. Aliphatic, alicyclic, and aromatic reactants, primary and secondar…
Abstract Reinforcement has been described as “the enhancement of one or more properties of an elastomer by the incorporation of some ingredient thus making it more suitable for a given application”. This definition gives an excellent qualitative description of the reinforcement of an elastomer, but lacks the quantitat…
Abstract High molecular weight polyterephthalamides were synthesized from a homologous series of primary diamines (ethylenediamine to hexamethylenediamine) by the interfacial polycondensation method. These polymers were found to be extremely high‐melting (300–450°C). and difficult to dissolve. Fibers were prepared by…
It is widely recognized that electron tube failures may be classified into two types: sudden and delayed. A mixture of two Weibull distributions, each representing one type of tube failure, is proposed, and a simple graphical method for estimating the parameters of the mixed Weibull distribution described.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic Spiropyrans. I. The Effect of Substituents on the Rate of Ring ClosureElliot Berman, Richard E. Fox, and Francis D. ThomsonCite this: J. Am. Chem. Soc. 1959, 81, 21, 5605–5608Publication Date (Print):November 1, 1959Publication History Published online1 May 2002…
Abstract Heretofore, the master stress relaxation curves of amorphous polymers could only be resolved by approximation methods into a continuous distribution of relaxation times. This is obviously not entirely satisfactory in all cases, e.g., for Maxwellian stress decay or if the Rouse distribution for the rubbery flo…
Abstract Contrary to what has been thought before, polyesters containing meta phenylene groups can be crystallized. The entropies and enthalpies of melting of isomeric poly‐isophthalates and polyterephthalates have been determined. It is shown that the lower crystal melting points of the polyisophthalates are due main…
Abstract A compound between aluminum oxide and aluminum nitride can be produced in a reductive atmosphere above 1650°C. A new spinel formula AlN–Al2O3 should be adopted instead of the previous one Al2O–5Al2O3 or Al3O4. The physical constants of AlN-Al2O3 are as follows: crystal structure Fd3m, Z=8, a=7.940 Å; density…
A high temperature diffractometer has been used to determine the lattice spacing-temperature relations for both α- and β-titanium. For α-titanium, the mean coefficients of thermal expansion over the temperature range 0-600°C are 9.55 x 10 -6 deg -1 for the a spacing, and 10.65 x 10 -6 deg -1 for the c spacing; for β-t…
The thermal conductivity of clear fused silica was measured over the temperature range 300–2100°K in an experiment which minimized radiative energy transport. This was a steady-state experiment involving the measurement of the electric current and voltage drop through a fine tungsten wire which was embedded along the…
A high‐water‐pressure high‐temperature study has been conducted of the systems Y 2 O 3 ‐H 2 O, Sm 2 O 3 ‐H 2 O, Nd 2 O 3 ‐H 2 O, and La 2 O 3 ‐H 2 O. The trihydroxides La(OH) 3 , Nd(OH) 3 , and Sm(OH) 3 are isomorphous, but Y(OH) 3 does not belong to this group. On the other hand, the oxyhydroxides YOOH, SmOOH, and Nd…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAssociation Reactions for Poly(alkylene Oxides) and Polymeric Poly(carboxylic Acids)K. L. Smith, A. E. Winslow, and D. E. PetersenCite this: Ind. Eng. Chem. 1959, 51, 11, 1361–1364Publication Date (Print):November 1, 1959Publication History Published online1 May 2002Publishe…
Abstract Deterioration in poly(vinyl chloride) is due primarily to zipperlike elimination of hydrogen chloride from the polymer chain, with formation of colored and easily oxidizable polyenes. Baum and Wartman have shown that elimination is initiated by rupture of certain particularly labile carbon‐chlorine bonds. The…