Materials Literature
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Abstract While consideration of the crystalline domains have long dominated research in understanding the properties of semicrystalline polymers, a satisfactory understanding of crack growth in these materials can only be realized by developing corresponding analytical tools to characterize the amorphous region. Since…
Tungsten oxide gels were prepared by a sol-gel process from a tungsten ethoxide/ethanol/water solution (sol). Tungstic hydrates were observed in high-viscosity sol by Raman spectroscopy. As the sol is reduced to the gel, Raman bands ascribed to amorphous tungsten oxide appeared. The result of the Raman measurement sho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer brush at high coveragePik Yin Lai and Avi HalperinCite this: Macromolecules 1991, 24, 17, 4981–4982Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pubs.acs.org/doi/10.1021/ma00017a040https://…
Highly oriented pyrolytic graphite (HOPG) has been studied by several groups as an electrode material, due mainly to its well‐defined surface structure compared to more commonly used materials such as glassy carbon. The basal plane of HOPG is also a common standard for scanning tunneling microscopy because it is atomi…
The reductive chemistry of a series of progressively more saturated Ni(II) porphyrins, derived from anhydromesorhodochlorin XV methyl ester, has been examined as models of F430. Cyclic voltammetry, spectroelectrochemistry, electron paramagnetic resonance, and X-ray absorption studies are used to characterize the paren…
Southern blot analysis indicated that the gene encoding the constitutive, NADP-linked bile acid 7 alpha-hydroxysteroid dehydrogenase of Eubacterium sp. strain VPI 12708 was located on a 6.5-kb EcoRI fragment of the chromosomal DNA. This fragment was cloned into bacteriophage lambda gt11, and a 2.9-kb piece of this ins…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polymers containing mesogenic units based on half-disk and rodlike moieties. 5. Side-chain liquid-crystalline poly(methylsiloxanes) containing hemiphasmidic mesogens based on 4-[[3,4,5,-tris(alkan-1-yloxy)benzoyl]oxy]-4'-[[p-(propan-1-yloxy)benzoyl]oxy]bip…
Abstract Pierre shale samples from a thin stratigraphic zone within the contact aureole of the lamprophyric Waisen dike record changes due to thermal effects that are not influenced by detrital differences. Analyses of fixed-NH 4 , mineralogy, and Rock-Eval pyrolysis indicators of organic matter maturity provide new i…
Simultaneous application of colloidal processing and liquid‐forming additives to alumina resulted in a sintered density of >99% in 1 h at a temperature as low as 1070°C for a commercial high‐purity alumina powder at a total dopant level of 2 mol%. The additives were 0.9% CuO + 0.9% TiO 2 + 0.1% B 2 O 3 + 0.1% MgO.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical spectrometry of the .beta.-relaxation in poly(methyl methacrylate)E. Muzeau, J. Perez, and G. P. JohariCite this: Macromolecules 1991, 24, 16, 4713–4723Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polybenzimidazole/poly(ether imide) blends: a spectroscopic studyP. Musto, F. E. Karasz, and W. J. MacKnightCite this: Macromolecules 1991, 24, 17, 4762–4769Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published ini…
Jute fibers were investigated to verify their possible application in reinforcement of thermoplastics. A laboratory press was modified and laminates were produced using polymer films of LDPE, HDPE, PE copolymer, and PP as interlayers. Variations of the processing parameters were carried out in order to find optimal ad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA photochemical study of poly(3-hexylthiophene)Steven HoldcroftCite this: Macromolecules 1991, 24, 17, 4834–4838Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pubs.acs.org/doi/10.1021/ma00017a017htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of ligands, solvent, and variable sulfonation on dimer formation of aluminum and zinc phthalocyaninesulfonatesPaul C. Martin, Martin Gouterman, Barry V. Pepich, George E. Renzoni, and Deborah C. SchindeleCite this: Inorg. Chem. 1991, 30, 17, 3305–3309Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of compounding and starch modification on properties of starch-filled low-density polyethyleneRoque L. Evangelista, Wei Sung, Jay Lin Jane, Robert J. Gelina, and Zivko L. NikolovCite this: Ind. Eng. Chem. Res. 1991, 30, 8, 1841–1846Publication Date (Print):August 1, 1…
Vitronectin (VN) was competitively adsorbed with human serum albumin (HSA), fibrinogen (FGN), and fibronectin (FN) from binary component mixtures in order to compare the relative affinities of these proteins for various polymer materials. Competitive adsorption was monitored by incubating radiolabeled protein solution…
Abstract An elegant procedure is proposed for obtaining components of the orthotropic or anisotropic in‐plane permeability tensor from experimental data on flow front position and time. A radial flow geometry allows the shape of the advancing flow front to be dictated by the in‐plane permeability of the fabric media.…
This manuscript considers certain aspects of mineral deposition in bone and other vertebrate calcifying tissues in order to examine physical, chemical, and biological factors important in the mineralization process. The paper in a discussion format principally presents a new data and the formulation of concepts based…
Orientational order in the isotropic phase of liquid crystals confined to 0.2-\ensuremath{\mu}m-diam cylindrical channels of Anopore membranes is measured by deuterium nuclear magnetic resonance. At temperatures deep in the isotropic phase, the measurements reveal the order of the first molecular layer at the cavity w…
Plates of calcite (CaCO3) were implanted in rabbit tibiae, and their biocompatibility and bonding ability to bone were studied. The plates were also implanted subfascially in rabbit muscle for 8 weeks, and changes on their surfaces in the body were examined. Contact microradiography and Giemsa surface stain demonstrat…