Materials Literature
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Details of valve morphology are used to differentiate between Tabellaria quadriseptata Knudson and T. flocculosa (Roth) Kütz. in cleaned material. Results substantiate Knudson's species description of T. quadriseptata. Characteristics used to separate the two species are valve shape, nature of marginal spines, and loc…
Abstract Our preliminary investigations indicate that recycled rubber crumb may be used as a toughening agent for brittle thermoplastic such as polystyrene. The toughness of the resultant materials was found to increase with increasing rubber-to-matrix adhesion and decreasing particle size. Although crazing is expecte…
Abstract The bubble growth in polymeric fluids under nonisothermal conditions has been molded using the viscoelastic constitutive equation of Leonov incorporating the diffusion of gas from the melt to the bubbles. The gas diffusion seems to be the primary mechanism of bubble growth. The theoretical predictions for Han…
The reflection and refraction of light of wavelength lambda at an angle of incidence Phi by the interface between two dielectric media of refractive indices N(0) and N(2) can be made completely independent of polarization by introducing a thin layer of refractive index N(1) = (N(0) N(2))(1/2) and thickness d = (lambda…
The method of preirradiation grafting of acrylic acid and methacrylic acid onto polyethylene films was studied. The trapped radicals and hydroperoxides or diperoxides appeared to be able to induce graft polymerization. Mohr's salt was added to depress homopolymerization. The influences of crystallinity, dosage, and st…
A simple model which accounts for the effects of the electron-molecular vibration (e-mv) interaction on the vibrational spectra of regular mixed stack charge-transfer complexes is presented and compared with that working for dimerized mixed stack compounds. The proposed interpretative scheme makes the spectra a powerf…
A pyro-electric technique is developed which allows the measurement of the dielectric response near the A*-C* phase transition in ferroelectric liquid crystals. The temperature dependence of the elastic modulus K θ(T) corresponding to the molecular tilt in smectic layers is calculated from the experimental data. Direc…
Using microlithographic techniques to define the Ag sensitized area, the lateral profile of Ag diffusion in GexSe1−x (x≊0.1) glass is made directly visible with an optical microscope. Experimental measurements have verified that Ag photodoping in Ge0.1Se0.9 glass obeys Fick’s diffusion law with a constant diffusivity.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and crystal structure of a diamagnetic copper(II) trichloroacetate complex containing a nitroxyl radical ligandLeigh C. Porter and Robert J. DoedensCite this: Inorg. Chem. 1985, 24, 7, 1006–1010Publication Date (Print):March 1, 1985Publication History Published o…
A Landau theory is developed for uniaxial and biaxial nematic phases, based on the order parameter S αβ ij . Four nematic phases, two uniaxial and two biaxial, are predicted and their symmetries are discussed. A typical phase diagram is presented and comparisons are made with earlier mean field theories and Landau the…
As an example of the free radical polymerization reactor we have conducted a theoretical study of the high pressure polyethylene tubular reactor with cooling from the jacket. The plug flow model including the axial dispersion is considered with as well as without the steady state assumption for the active intermediate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of boron substituents in borirenes, boriranes, and boranes. The energies of B-X bondsPeter H. M. Budzelaar, Alexander J. Kos, Timothy Clark, and Paul von Rague SchleyerCite this: Organometallics 1985, 4, 3, 429–437Publication Date (Print):March 1, 1985Publication His…
The deep violet, crystalline binuclear manganese complex 3 is formed in ca. 30% yield on irradiation of a mixture of the tricarbonyl complex 1 and thiirane S-oxide 2. The Mn–S distances are short (ca. 212 pm) and the SO bond is hardly longer (150.4 pm) that that of free SO. There is no bonding interaction between the…
The use of large volume sealed stainless steel capsules has allowed the measurement of a transition temperature in wool at a range of moisture contents using differential scanning calorimetry. Aged wool showed an endothermic peak that disappeared after cooling from above the transition temperature, but was restored wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBehavior of automotive noble metal catalysts in cycled feedstreamsHideaki Muraki, Hirofumi Shinjoh, Hideo Sobukawa, Kohji Yokota, and Yoshiyasu FujitaniCite this: Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 1, 43–49Publication Date (Print):March 1, 1985Publication History Publ…
The syntheses of several 4-n-alkyl-, 4-[2-(trans-4-n-alkylcyclohexyl)ethyl]-, 4-[2-(4-n-alkylphenyl)ethyl]- and 4-n-alkoxy-4′-cyano-2′-fluorobiphenyls and -4′-cyano-2-fluorobiphenyls are presented and the transition temperatures for these compounds are reported and discussed. In the alkylcyanobiphenyls, a 2-fluoro-sub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of the correlation hole in homogeneous block copolymer meltsFrank S. BatesCite this: Macromolecules 1985, 18, 3, 525–528Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1 March 1985https://pubs.acs.org/doi/10.1…
Abstract not Available.
A review is given of the phenomenological description, the experimental determination and the theoretical considerations and calculations of the anchoring energy in liquid crystals. The order of magnitude of the anchring energy is also compared with the bulk and interfacial energies of liquid crystals.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly[p-(formyloxy)styrene]: synthesis and radiation-induced decarbonylationJean M. J. Frechet, Theodore G. Tessier, C. Grant Willson, and Hiroshi ItoCite this: Macromolecules 1985, 18, 3, 317–321Publication Date (Print):March 1, 1985Publication History Published online1 May…