Materials Literature
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The rheological behavior of PVC emulsion resin plastisols was investigated in steady shear flow. The shear rate dependence of the plastisol viscosity was influenced by (1) Brownian diffusion, (2) partial dissolution of the suspended resin, and (3) particle‐particle interactions. Partial dissolution of polymer from the…
Degradation of natural or man‐made polymers in supercritical acetone offers considerable advantages because sensitive products can be detected and secondary reactions largely suppressed. Cellulose and chitin serve as examples to demonstrate the conveint nature of this procedure.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of terbium(III) fluorescence enhancement to selectively monitor DNA and RNA guanine residues and their alteration by chemical modificationDavid P. Ringer, Stuart Burchett, and Donald E. KizerCite this: Biochemistry 1978, 17, 22, 4818–4825Publication Date (Print):October…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and thermal decomposition of homoleptic tert-butyl lanthanide complexesAndrea L. Wayda and William J. EvansCite this: J. Am. Chem. Soc. 1978, 100, 22, 7119–7121Publication Date (Print):October 1, 1978Publication History Published online1 May 2002Published inissue 1…
Abstract Several dioctahedral clay minerals are related through reaction series. These series can be produced hydro-thermally from beidellite gel and montmorillonite by making simple changes in interlayer and solution chemistry. The series are: gel-K-beidellite-random illite/smectite-K-rectorite-illite K-montmorilloni…
Abstract Gelation and melting of aqueous gelatin were investigated by differential scanning calorimetry. This phenomenon can be analyzed as a conventional crystallization process assuming predetermined primary nucleation and unidirectional growth. The results were interpreted in terms of the fringed micelle model. Cal…
Abstract Samples of low‐density polyethylene (LDPE), high‐density polyethylene (HDPE), and tetratetracontane ( n ‐C 44 H 90 ) free from additives were heated in air at temperatures between 120 and 180°C. As a comparison, “as received” HDPE containing unspecified additives has also been included. The structural changes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe octahedral hexasilver molecule. Seven crystal structures of variously vacuum-dehydrated fully silver(1+)-exchanged zeolite AYang Kim and Karl SeffCite this: J. Am. Chem. Soc. 1978, 100, 22, 6989–6997Publication Date (Print):October 1, 1978Publication History Published on…
The structure of an iron porphyrin with dichlorocarbene as ligand has now been estabished by X-ray analysis. The complex (1) accordingly contains a planar Fe(TPP)skeleton with H2O and CCl2 as axial ligands. The structural unit (2) is almost linear.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanion supported organometallics: synthesis and characterization of .alpha.[(.eta.5-C5H5)Ti(PW11O39)]4-R. K. C. Ho and W. G. KlempererCite this: J. Am. Chem. Soc. 1978, 100, 21, 6772–6774Publication Date (Print):October 1, 1978Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature solution preparation of Group 4B, 5B and 6B transition-metal dichalcogenidesRussell R. Chianelli and Martin B. DinesCite this: Inorg. Chem. 1978, 17, 10, 2758–2762Publication Date (Print):October 1, 1978Publication History Published online1 May 2002Published…
The influence of Ar on the recrystallization of implanted amorphous silicon layers has been studied. Investigation of the growth kinetics at temperatures up to 575 °C showed that epitaxial regrowth of silicon is halted if the Ar concentration at the amorphous–single-crystal interface reaches about 1.5×1020 cm−3. Furth…
The electrical properties of thin sandwich cells (M/Pc/Au) have been studied in a quantitative fashion. Here, M is either aluminum or indium (150–400 Å thick), and Pc represents metalfree phthalocyanine (H2Pc) or its zinc complex (ZnPc). The phthalocyanines were ∼3000 Å thick. These devices were assembled by depositio…
In the present paper a diagrammatic analysis of the density operator for the evaluation of nonlinear optical quantities is considered. The present approach extends earlier diagrammatic analysis by treating the time evolution of both the wave function and its complex conjugate. Time-ordered graphs result, each of which…
A detailed discussion is given of the use and misuse of effective atomic numbers in the formulation of tissue substitute materials. An extension to the general concept is described, which permits a more rigorous application of the quantity to simulation studies. The practicalities of the new technique, called the Exte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction of KH2PO4 from KCI and H3PO4 in an Organic Liquid MediumEliezer Rubin, Edward Szpruch, and Aluf OrellCite this: Ind. Eng. Chem. Process Des. Dev. 1978, 17, 4, 460–468Publication Date (Print):October 1, 1978Publication History Published online1 May 2002Published in…
The low-temperature magnetic structure of the hexagonal modification of FeGe has been determined by neutron diffraction methods. Below a transition temperature of 30.5+or-0.5K, the iron moments cant away from the (001) direction to form a double-coned structure in which alternate antiferromagnetically aligned (001) sh…
Epitaxy is the phenomenon in which the orientation of a crystal 0 which grows on a crystalline substrate S, usually different from 0, is related to that of S, even though their normal lattices do not match at their common interface. Apart from its fundamental interest, epitaxy is important in view of its application i…
Abstract The course of the chlorination reaction of cis ‐1,4‐polybutadiene is dependent on the choice of solvent. When methylene chloride is used, a pure addition reaction of chlorine leads to a polymer with the structure of head‐to‐head, tail‐to‐tail PVC. The thermal stability of the head‐to‐head PVC polymer has been…
An electro-optic display mechanism is described which uses a smectic A liquid crystal of positive dielectric anisotropy. Information can be written on the display, stored there without a sustaining voltage i.e. has a memory, and subsequently can be erased electrically. The erase mechanism involves a dielectric re-orie…