Materials Literature
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Abstract Mechanical and rheological properties of blends of a thermotropic liquid crystalline polyester with a polycarbonate have been investigated. The blends are fibrillar in character and exhibit great hardness and toughness due to high degree of molecular orientation which develops during the melt blending and pro…
TEM was used to observe nanoscale microstructural changes which occur over a range of PMN-PT compositions. Increasing PT additions to the PMN-PT solid solution modify ferroelectric and structurally ordered domains. The relevance of nanostructural changes to the corresponding dielectric properties are briefly discussed.
A detailed examination is presented of the causes, removal, and use of differential charging in x-ray photoelectron spectroscopy [electron spectroscopy for chemical analysis (ESCA)] and related spectroscopies. Particular attention is devoted to the impact of this phenomenon during the dispersion (or conversely crystal…
Resonance Raman (RR) spectra have been analyzed for porphyrin radical cations prepared electrochemically from the Ni<sup>2+</sup>, Cu<sup>2+</sup>, VO<sup>2+</sup>, and (Cl<sup>-</sup>)Fe<sup>3+</sup>complexes of octaethylporphyrin (OEP) and meso-tetraphenylporphyrin (TPP). Band assignments have been secured via polar…
In this paper we report on the existence, distribution, crystallographic orientation, size, and morphology of graphite crystallites within diamond films prepared by microwave plasma assisted chemical vapor deposition. Transmission electron microscopy and Raman spectroscopy techniques were used to characterize graphite…
Crystallized as-grown Bi(Pb)-Sr-Ca-Cu-O thin films are formed by the laser ablation method at a substrate temperature as low as 480 °C under N2O gas flow. Moreover, the as-grown thin film, which has a crystal structure consisting of four or five CuO2 layers between adjacent Bi2O2 layers, can be formed by the combinati…
Phase transitions of L - and D -enantiomers of 4-(1-methylheptyloxycalbonyl)phenyl 4'-octyloxybiphenyl-4-carboxylate (MHPOBC) were studied by the DSC method. Two new phases have been observed between the smectic A phase and the smectic C * phase and between the smectic C * phase and the third stable state ( S Y * phas…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation P. A. Steinmann, H. E. Hintermann; A review of the mechanical tests for assessment of thin‐film a…
The magnetic properties of single crystals of the chain compound formed by manganese(I1) hexafluoroacetylacetonate and the nitronyl nitroxide radical NIT-i-Pr (NIT-i-Pr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-l-o3x-yolx ide), Mn(hfa~)~NIT-i-Phra,v e been investigated at low temperature to character…
Abstract The effect of deformation history on the morphology and properties of liquid crystalline polymers (LCP) blended with polycarbonate resin was assessed. The addition of an immiscible LCP phase was found to improve the melt processability of the host thermoplastic polymer. In addition, by employing a suitable de…
The preparation and mesomorphic properties of a series of bis-(4-alkyl- or 4-alkoxy-benzoyloxy)-trans-1,4-dioxanes 1, trans-1,4-dithianes 2 and trans-1,4-cyclohexanes 3 are reported and compared to the corresponding hydroquinone bis-esters 4. The 1,4-dithianes 2 do not show liquid crystalline properties and the 1,4-di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and liquid-crystalline properties of (acetyl)(ethyl)celluloseJian Xin Guo and Derek G. GrayCite this: Macromolecules 1989, 22, 5, 2082–2086Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyphosphazene electrolytes for lithium batteriesGholamabbas Nazri, Donald M. MacArthur, and John F. OgaraCite this: Chem. Mater. 1989, 1, 3, 370–374Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs.ac…
The highly reproducible pH-stat technique was used to study the influence of various types of inhibitors on the precipitation of calcium phosphate from solution. Three types of inhibitors were evaluated: (1) homo- and copolymers of acrylic acid, (2) polyphosphate and phosphonates, and (3) polycarboxylic acids. Experim…
Abstract A perturbation expression of the gyromagnetic factor of d 3 ions is derived considering the spinorbit coupling of the ligand ions and taking into account all the excited states besides 4 T 2 state. The molecular orbital coefficients are determined by means of a semiempirical method in estimating the g ‐shift.…
X-ray generated photoelectron and Auger transition data for several phosphorus reference compounds, including PCl3, P3 N5, P2 O5, (C6 H5 )3 P(C5 H4 ), (C6 H5 )4 PBr, KH2 PO4 , NH4H2PO4, and NH4 PF6 are presented. These data have been used to determine the relative ionicity and polarizability of phosphorus in the chlor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-hydrogen and carbon-hydrogen bond activation in ethylene glycol by atomic oxygen on silver(110): heterometallacycle formation and selective dehydrogenation to glyoxalArmand J. Capote and Robert J. MadixCite this: J. Am. Chem. Soc. 1989, 111, 10, 3570–3577Publication D…
Heat treatment of a bare single-domain lithium niobate plate at somewhat lower temperatures than the Curie temperature causes a local polarization reversal, thereby yielding a ferroelectric inversion layer. The plate with such an inversion layer can serve as a piezoelectric actuator similar to the bimorph, because the…
Abstract Novel heteroquinonoid compounds as potential electron acceptors, 2,5-bis(dicyanomethylene)-2,5-dihydrothieno[3,2-b]thiophene (4a), 3,6-dibromo derivative, 2,6-bis(dicyanomethylene)-2,6-dihydrodithieno[3,2-b:2′,3′-d]thiophene, 3,5-dibromo derivative, and 4,4-dioxide were synthesized by the action of tetracyano…
On the basis of a critical analysis of Li's disclination model of large-angle boundaries, the disclination-structural unit model is developed, combining both the atomistic and the mesoscopic levels of description of the grain-boundary structure. The curve of energy against misorientation angle for symmetrical [001] ti…