Materials Literature
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Abstract The belt-skim rubber of a passenger-car tire has changes in its tensile properties, M 100 and λ b , during service in the field. The changes are larger in higher temperature fields with an equivalent duration. It can be interpreted that the changes are caused simply by oxidative crosslinking similar to that w…
Abstract In the course of work on linear and ring polybutadienes with 62% 1,2 units, a number of discrepancies were noted with data on polybutadienes of various microstructure available in the literature. For example, G N ο =870 kPa for our 62% 1,2-polybutadiene. This is larger than G N ο =730 kPa for a 56% 1,2-polybu…
The optical properties of VO 2 and V 2 O 5 were determined using spectroscopic ellipsometry. The unique physical properties of these materials will be presented and discussed in conjunction with the materials electronic band structure determined by calculations using the orthogonalized linear combination of atomic orb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe thermoreversible gelation of syndiotactic polystyreneA. Prasad and L. MandelkernCite this: Macromolecules 1990, 23, 23, 5041–5043Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs.acs.org/d…
Abstract Haplohumults and Argixerolls have formed in close proximity on phyllite colluvium and serpentinite residuum, respectively, in the Klamath Mountains of northwestern California. This study was conducted to compare their contrasting properties and to investigate soil mineral weathering. Thick, dark A horizons co…
As shown in an earlier publication (Håkansson 1990) C. kuetzingiana Thwaites and C. meneghiniana Kütz. are conspecific and for this the name C. meneghiniana has to be used. A new name, C. krammeri, is now proposed for the taxon that has long been called C. kuetzingiana and the similarity of this species to C. ocellata…
Abstract A series of carbon blacks of widely varying morphology and microstructure were analyzed for surface compositional properties employing SIMS, XPS/ESCA, and GC-MS. These studies were supported by bulk analyses for hydrogen and oxygen content. Surface reactivity was assessed by means of inverse gas chromatograph…
The switching of polarization in ferroelectrics is considered as the first-order phase transition. By the analogy with the theory of crystal growth it is assumed that the switching process is determined by the oversaturation degree which correspond in ferroelectrics to the magnitude of electric field on the domain bou…
Ilex crenata Thunb. `Rotundifolia' split-root plants were grown for 3 weeks with root zones at 30/30, 30/34, 30/38, 30/42, 34/34, 38/38, and 42/42C. The 38C root-zone treatment was the upper threshold for several growth and physiological characteristics. A portion of the root system grown at or near the optimum temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotal synthesis of (+)-verrucosidinKonghyun Whang, R. J. Cooke, Gurol Okay, and Jin K. ChaCite this: J. Am. Chem. Soc. 1990, 112, 24, 8985–8987Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs…
Results referring to liquid crystalline isothiocyanates especially as components of liquid crystal mixture were summarized. The outstanding feature of liquid crystalline isothiocyanates is the possibility to make mixtures with a wide range of nematic phase low viscosity and weak temperature dependence of viscosity. Th…
The well-known two-dimensional octagonal quasilattice is realized by means of dualization and Klotz construction. We discuss the geometric properties and the extended symmetry of the pattern. The concept of geometric defects is introduced, and an elastic energy measure \ensuremath{\Delta}E is presented that allows a s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox catalysis involving substrate photooxidation with catalyst regeneration by substrate reduction. Simultaneous oxidative C-H bond cleavage and reductive C-S bond cleavage in thioethers catalyzed by polyoxotungstate, W10O324-R. Carlisle Chambers and Craig L. HillCite this…
Abstract New side‐on liquid‐crystalline side‐chain polymers (LCSCP's) are presented as having a systematic variation of the anisotropy of polarizability with respect to the mesogenic short axis. Starting from hydroquinone as core of the rod, the polarizability perpendicular to the mesogenic long axis is increased step…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroporous poly(methyl methacrylate) membranes: effect of a low-viscosity solvent on the formation mechanismFu Jya Tsai and John M. TorkelsonCite this: Macromolecules 1990, 23, 23, 4983–4989Publication Date (Print):November 1, 1990Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuadratic hyperpolarizabilities of Group 6A metal carbonyl complexesL. T. Cheng, W. Tam, and D. F. EatonCite this: Organometallics 1990, 9, 11, 2856–2857Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990ht…
Preparation schemes for high‐purity vitreous B 2 S 3 ( v ‐B 2 S 3 ) with a S:B ratio of 1.478 ± 0.032 are described. Preparation schemes reported in the literature are shown by very sensitive FT‐IR measurements to yield v ‐B 2 S 3 with significant oxygen contamination. Through extreme care taken in carbonizing silica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance studies of "FeO6" tris chelate complexes: models for the effects of zero-field splitting in distorted S = 5/2 spin systemsDavid Collison and Anne K. PowellCite this: Inorg. Chem. 1990, 29, 23, 4735–4746Publication Date (Print):November 1, 1990Publicat…
Abstract The nucleation of barite has been studied in a system involving the doublediffusion of Ba 2+ and SO 4 2- in an Na-rich aqueoussolution, through a porous medium. The evolution of the concentration profiles in the medium, which is a column of porous silica gel, has been determined as a function of time by direc…
To investigate the kinetics of porous flow in partially molten peridotite, a melt migration couple – formed from a disc of fine‐grained olivine plus ∼15% of a synthetic K‐Al silicate glass and a disc of poly crystalline olivine – was heated at 1255°C under a confining pressure of 300 MPa for 2 hr. Driven by capillary…