Materials Literature
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First experiments show that cross-linked liquid-crystalline polymers, which are swollen with nematic low molar mass liquid crystals and freely dispersed in this liquid crystal, change their shape if an electic field is applied. This shape variation depends on the degree of swelling.
Abstract The anionic ring‐opening polymerization of 2,2‐dimethyltrimethylene carbonate in solution with sec ‐butyllithium as initiator was found to result under suitable conditions in a bimodal molecular weight distribution, vic. cyclic oligomers and a high‐molecular‐weight polymer. The concentration of cyclic oligome…
Abstract A study about the competition between organic anions (oxalate and malate)—currently present in the rhizosphere and phosphate for adsorption sites in tropical soils—indicate that in the presence of organic anions, phosphate adsorption by soils is reduced. The extent of such reduction is dependent on the way in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic excitation in poly(di-n-hexylsilane)Kenneth A. Klingensmith, John W. Downing, Robert D. Miller, and Josef. MichlCite this: J. Am. Chem. Soc. 1986, 108, 23, 7438–7439Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration mechanism of short-chain branching distribution in linear low-density polyethylenesTakao Usami, Yukitaka Gotoh, and Shigeru TakayamaCite this: Macromolecules 1986, 19, 11, 2722–2726Publication Date (Print):November 1, 1986Publication History Published online1 May…
Abstract A method to study the forced in‐plane flow of an epoxy resin into fibrous networks is presented. A radial in‐plane flow apparatus has been developed which allows strict control of all important experimental variables as well as visual observation of the experiment. From the position and shape of the advancing…
The thermoelectric power of glassy carbon, heat-treated for three hours between 1200 and 2700°C, has been measured at temperatures from 1·5 to 280 K. The dependence of thermoelectric power S on temperature T can empirically be written as S = aT + bT ½ + S B, where the first term is a strong-scattering metallic compone…
Abstract Die kurzzeitige Behanlung ( t ≦ 300 s) von Polyethylen‐ und Polypropylenfolien im nichtthermischen Plasma von O 2 ‐ und NH 3 ‐Hochfrequenz‐Glimmentladungen und die damit verbundene Schaffung von funktionellen Gruppen an der Polymeroberfläche führte zu erheblichen Verbesserungen der Adhäsion von aufgedampften…
Annth power generalization of Longo's roll-off curve equation is proposed. A method for finding the exponentnfrom an experimental curve is given. Eng's model corresponds approximately ton = 5, Good electron guns havenvalues in the 6 to 10 range. The use of n as a figure of merit for quality control is discussed. The c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of argon-ion bombardment on the basal plane surface of molybdenum disulfideJeffrey R. Lince, David J. Carre, and Paul D. FleischauerCite this: Langmuir 1986, 2, 6, 805–808Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published…
Changes in the microfissuring susceptibility of alloy 718 due to solution annealing and age hardening are studied. The effects of Ni3Nb (delta) precipitation during solution annealing and gamma-prime + gamma-double-prime precipitation during age hardening on microfissuring are investigated. It is observed that solutio…
Conductivity investigations have been performed at highly pure zinc oxide films under equilibrium conditions in the temperature range from 300 to 1000 K in oxygen (1 to 150 mbar). The conductivity behavior has to be divided into two temperature ranges. Above 800 K, the slope of vs. corresponds to 1.6 eV and the oxygen…
Abstract It is important to assess the effects of ionic strength and type of anion when studying adsorption of metals on soils and soil components because the background salt may complex metals and compete for adsorption sites. Four experiments were carried out to determine the effect of ionic strength and anions on Z…
Abstract Blends of polypropylene with ethylene‐propylene copolymers of various compositions have been studied by small angle neutron scattering with regard to their compatibility at room temperature and in the melt. It has long been known that such blends separate into distinct phases at lower temperatures due to the…
Abstract Boron adsorption behavior on the clay minerals kaolinite, montmorillonite, and illite was investigated. Adsorption increased at low pH, exhibited a peak in the pH range 8 to 10, and decreased at high pH. It was assumed that B adsorbs by means of a ligand exchange mechanism with aluminol groups at the edges of…
Analytical expressions for the elastic constants of nematic polymer solutions are derived when the macromolecules are monodisperse rod-like, bidisperse rodlike or semi-flexible. These expressions are derived in the gaussian approximation so that they constitute exact leading terms of a general asymptotic expansion for…
Results of the Morrison analysis applied to the curved Arrhenius plots of self-diffusion in copper, silver, gold, nickel and platinum are reported. Both temperature-dependent and temperature-independent energies and entropies are taken into consideration. The analysis is applied to the most reliable diffusion coeffici…
It has been shown that the lyotropic liquid-crystalline phases formed by certain dyes are structurally analogous to the chromonic N and M liquid-crystalline phases previously thought to be unique to certain anti-asthmatic/anti-allergic drugs. We suspect that these two groups of compounds will prove to be representativ…
It seems certain now that cholesteric liquid crystals (cholesterics, or CLC, for short) have been the first examples of mesomorphic state of matter known to humankind. Apart from the well-known discovery of the two-stage melting of cholesteryl benzoate made by Reinitzer in 18881 and cited in almost all the textbooks,…
Close-contact melting was investigated by performing a series of experiments in which blocks of solid n-octadecane (with circular or rectangular cross section) were melted by a horizontal planar heat source at constant surface temperature. Close contact between the source and the solid prevailed throughout the experim…