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The rate of isothe rm al bulk crystalli zation of poly (e hloro trifluoroethylene) , 2'm = 221 C, was measured from 170 0 to 200 0 C. The intrinsic bulk cr ystallization, which acc uraLe ly ~o llow e d a n n= 2 la\,:, was. shown t o be a res ult of the i~lj ect ion of primary nu clei spora di cally III Lime, with on e…
Abstract The problem of the mechanism of macromolecule orientation occurring in the formation of fibers from polymer melts has been qualitatively analyzed. As a result of birefringence, x‐ray, and spinning stress investigations carried out on polycapronamide fibers, the main parameters determining orientation have bee…
Abstract Vinyl-(I), allyl-(II), and 3-butenyl-trimethylsilane(III) were polymerized at 70°C in n-heptane with the heterogeneous catalyst of Ziegler’s type. The monomer I gave only a small yield of polymer, while the monomers II and III gave moderate amounts of polymers. The amorphous and crystalline polymers of these…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcetylenic Corrosion InhibitorsG. L. Foster, B. D. Oakes, and C. H. KuceraCite this: Ind. Eng. Chem. 1959, 51, 7, 825–828Publication Date (Print):July 1, 1959Publication History Published online1 May 2002Published inissue 1 July 1959https://pubs.acs.org/doi/10.1021/ie50595a0…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text R. N. Smartt and W. H. Steel, "Birefringence of Quartz and Calcite," J. Opt. Soc. Am. 49, 710-712 (1959) Export Citation BibTex Endnote (RIS) HTML Plai…
Measurements of the electrical conductivity σ, the thermal conductivity K, and the Seebeck coefficient (thermoelectric power) α, of InAs1−xPx have been made at high temperatures with x varying from 0 to 0.4. Between 450° and 800°C, the average thermoelectric figure of merit (z = α2σ/K) increases moderately with x for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacity and Thermodynamic Functions of β-Uranium Hydride from 5 to 350°K.1,2Howard E. Flotow, Harold R. Lohr, Bernard M. Abraham, and Darrell W. OsborneCite this: J. Am. Chem. Soc. 1959, 81, 14, 3529–3533Publication Date (Print):July 1, 1959Publication History Publ…
Abstract A study of the dynamic mechanical properties of a series of polyamide polymers and some related polymers has been made over a wide temperature range at about 100 cycles/sec. by means of a vibrating reed method. The character of the β dispersion of the polyamides occurring at about −40°C. is discussed in relat…
The ferroelectric properties of the calcium borate mineral colemanite are investigated in the ferroelectric and paraelectric temperature regions. It is shown that Devonshire's phenomenological theory may be applied successfully to account for the experimental measurements of spontaneous polarization and electrical sus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of Amorphous SiOGeorge W. BradyCite this: J. Phys. Chem. 1959, 63, 7, 1119–1120Publication Date (Print):July 1, 1959Publication History Published online1 May 2002Published inissue 1 July 1959https://doi.org/10.1021/j150577a020RIGHTS & PERMISSIONSArticle Views433Altme…
Nancy Worner Van Schaik, R Alexander Brink; TRANSPOSITIONS OF MODULATOR, A COMPONENT OF THE VARIEGATED PERICARP ALLELE IN MAIZE, Genetics, Volume 44, Issue
Several techniques useful in the preparation of spores, pollen, hystrichospherids, and similar acid-insoluble microfossils are described. These include oxidation treatments to remove unwanted organic matter; 4 aids in the mechanical separation of organic and mineral matter; and 2 methods for making permanent slides us…
Abstract Improvement in methods of characterizing the stress‐strain properties of vulcanized rubber and of determining its molecular weight prior to vulcanization are described. Experimental results obtained previously by Mullins, Moore, and Watson, in an attempt to relate the physical properties of natural rubber to…
Advantages and disadvantages of x-ray spectroscopy are enumerated. The two energy regions of the method are discussed in reference to differences, resolving power, corrections, and diagrams. Discussions of the extended structures and discrete loss of energy of electrons are presented. Emission bands for sodium, magnes…
Studies of the mechanism of pilling have demonstrated that pilling propensity is determined by the rates of fuzz formation, entanglement, and pill wearoff. Motion pictures of fabrics subjected to an abrading action showed that the abradant acted on exposed fiber sections to pull loops which then opened to form fuzz. A…
X‐ray diffraction data for the high‐temperature phases show that a spinel‐type structure develops with marked orientation at about 925°C. This phase is considered to be an aluminum silicon spinel with vacant cation sites. Mullite is thought to be formed by the decomposition of the spinel. Silica is eliminated progress…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel Calculation of the Temperature Dependence of Small Molecule Diffusion in High PolymersW. Wilfried BrandtCite this: J. Phys. Chem. 1959, 63, 7, 1080–1085Publication Date (Print):July 1, 1959Publication History Published online1 May 2002Published inissue 1 July 1959https…
When small amounts of lanthana, neodymia, niobia, or tantala are added to lead titanate zirconate compositions near the morphotropic (rhombohedral‐tetragonal) phase boundary, the modified ceramics show piezoelectric planar coupling coefficients of about 0.50 and substantially increased dielectric constants of up to 15…
By applying single‐crystal X‐ray techniques, it is shown that kaolinite transforms to meta‐kaolin and subsequently to a cubic spinel‐type phase by a process of orderlyrecrystallization. The dimensional and directional relations between the phases are established. On the basis of this information, together with the den…
The difficulties encountered in attempting to obtain relationships between the dimensions of knitted fabrics, the properties of the constituent yarns and the variable factors in knitting are discussed. It is suggested that the natural shape of the knitted loop is determined by minimum energy conditions, that the loop…