Materials Literature
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Abstract The diffusion of benzyl alcohol and plasticizer in compression‐molded sheets of plasticized poly(vinyl chloride) was studied over the temperature range 30–55°C. A simultaneous diffusion occurred for benzyl alcohol into polymer and for dioctyl phthalate as plasticizer from polymer into liquid when the polymer…
The influence of substrate temperature (20 °– 450 °C) and sputter gas pressure (0.5–100 Pa) on the evolution of coating morphology during growth of magnetron deposited copper films has been investigated for film thicknesses up to 10 μm. Classification of films according to structure and surface topography yields a str…
Abstract Weld or knit lines result wherever two or more polymer flow fronts unite. This results in a region of a different level of molecular entanglements than the bulk material. Consequently, weld regions have been observed to have inferior mechanical properties compared to the bulk. Although this phenomenon occurs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformations from octahedral geometry in d4 transition-metal complexesPavel Kubacek and Roald HoffmannCite this: J. Am. Chem. Soc. 1981, 103, 15, 4320–4332Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https://…
The small-angle X-ray scattering (SAXS) technique is used to study the transition in styrene-butadiene block copolymers from a microdomain structure to a disordered homogeneous phase. The transition, occurring on raising the temperature, is reproducible and thermally reversible. The SAXS intensity pattern, exhibiting…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly conducting linear stacked polymers: iodine-doped fluoroaluminum and fluorogallium phthalocyaninesRonald S. Nohr, Paul M. Kuznesof, Kenneth J. Wynne, Malcolm E. Kenney, and P. G. SiebenmanCite this: J. Am. Chem. Soc. 1981, 103, 15, 4371–4377Publication Date (Print):Jul…
Abstract Hot‐stage polarized light microscopy suggests that bulk hydroxypropylcellulose (Hercules Klucel E) is a cholesteric liquid crystal. Rheological measurements indicate this system exhibits shear viscosities similar to those of polyolefin melts except that it has a yield value comparable to suspensions. Birefrin…
Silicon dioxide films have been deposited by reacting silane and nitrous oxide in a parallel‐plate, radial flow, plasma reactor. Deposition parameters (temperature, power, and gas composition) have been systematically varied, and the films characterized by measuring the infrared spectra, deposition rate, density, etch…
Abstract The synthetic route to polyetherimides by displacement of nitro‐groups from disubstituted bis‐imides by the dianion of bisphenols are described. The prepration of bis‐imides and bisphenol dianions, their polymerization, and some of the properties of the polymers are presented in detail. The 13 C‐NMR spectra o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 CP/MAS NMR studies of methylchlorosilane reactions on silica gelDean W. Sindorf and Gary E. MacielCite this: J. Am. Chem. Soc. 1981, 103, 14, 4263–4265Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981h…
The crystal structure of avian pancreatic polypeptide (aPP), a 36-residue polypeptide with some hormonal properties, has been determined by using single isomorphous replacement and anomalous scattering to 2.1-A resolution. The phases were extended to 1.4-A resolution by using a modified tangent formula. The molecule c…
Abstract: SUMMARY: Many phyllosilicate minerals gain greatest mechanical stability on sedimentation by orienting themselves parallel to bedding. Loss of water during the initial stages of compaction also promotes or enhances such a preferred alignment. If the mineral is then buried in the absence of tectonic stress, s…
A new approach is presented for understanding the frequency and flux density dependence of eddy current losses in polycrystalline and amorphous soft magnetic materials by introducing an experimentally derived parameter which is thought to be proportional to the number of active domain walls. The relationship among edd…
Abstract The orientation of nematic liquid crystals (LC) by monolayers of suitable amphiphilic compounds on solid substrates has been studied by systematic experiments using polarizing microscopy, magnetic Freedericksz‐transition, and contact angle measurements. Orientation is influenced mainly by the following parame…
In heat exchange equipment, fouling biofilm formation causes a significant energy loss by increasing heat transfer resistance. This paper describes experiments which quantify the influence of fouling biofilms on heat transfer resistance under controlled laboratory conditions. Experimental results compare well with a r…
The fracture toughnesses of fused SiO 2 and float glass were measured at high temperatures. In both glasses, low‐temperature regions of elastic fracture were identified and correlated with the elastic moduli and their temperature dependence. A viscous flow contribution to the fracture toughness was identified in the f…
Advanced sintering techniques for consolidation of Si 3 N 4 powders in the presence of an oxygen‐rich liquid phase(s) require high temperatures and usually high nitrogen pressures. A stability diagram is constructed for Si 3 N 4 as a function of the partial pressures of nitrogen (P N2 ) and silicon (P Si ). High P N2…
Abstract The spin‐lattice relaxation times T 1 of the oxygen‐17 isotope in light and heavy water have been measured at 13.56 MHz in the temperature range 457 K to 238 K and up to pressures of 250 MPa. Below 300 K all isotherms exhibit maxima of T 1 which become most pronounced at the lowest temperatures measured. A ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of the Jahn-Teller theorem in inorganic chemistryJeremy K. BurdettCite this: Inorg. Chem. 1981, 20, 7, 1959–1962Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https://pubs.acs.org/doi/10.1021/ic50221a003htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDerivatives of heteropolyanions. 3. O-alkylation of Mo12PO403- and W12PO403-W. H. Knoth and R. L. HarlowCite this: J. Am. Chem. Soc. 1981, 103, 14, 4265–4266Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https:…