Materials Literature
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Abstract A nonlinear conservation equation for the fluid concentration field during onedimensional viscoelastic diffusion is derived by retaining the concentration dependencies of physical properties in the fluid flux expression from the nonequilibrium thermodynamic treatment of Durning and Tabor (1986). The result is…
Abstract As a means of developing the most accurate possible Mark‐Houwink relationship possible for PVC, the literature Mark‐Houwink coefficients for the weight average molecular weight ( M W ) of PVC in THF are plotted and the derived “grand average” Mark‐Houwink relationship ( K = 15.56 × 10 −3 ml/g, a = 0.7690) is…
Plastic crystals, such as neopentylglycol, 2, 2-dimethyl-1,3-propanediol, that exhibit polymorphic behavior are emerging materials for thermal energy storage. The energy is stored isothermally in the γ phase, FCC, during solid-state phase transformations. This γ phase of NPG has been determined as an orientational dis…
Abstract A set of mathematical models as a thermoplastic pultrusion process is evaluated. The predictions of the models are compared to experimentally obtained data in terms of composite temperature and pressure and process pulling force. The comparisons between predictions and experiments are made for two different m…
The effect of the valence state of copper in copper metaphosphate glass on the crystallization behavior and glass transition temperature has been investigated. The crystallization of copper metaphosphate is initiated from the surface and its main crystalline phase is copper metaphosphate (Cu(PO) 3 ), independent of th…
A slender type diatom is observed. The settling behavior and surface electrostatic situation of the diatom are discussed through the consideration of physiological activity and observation by SEM. By considering the settling behavior, one side of slender type diatoms such as Nitzschia and Synedra is heavier than the o…
Abstract Small‐angle light‐scattering (SALS), Polarized light microscopy (PLM), differntial scanning calorimetry (DSC), and small‐angle x‐ray scattering (SAXS) were used to study morphological changes in segmented polyurethanes with 4,4′‐diphenylmethane diisocyanate (MDI) and 1,4‐butanediol (BD) as the hard segment. I…
It is customary in the physicochemical literature to define the static transverse dielectric function of a polar fluid according to the relation εT(k) = 1 + 4πβST(k), where β=(kBT)−1 and ST(k) is a measure of the static fluctuations of the Fourier components of the transverse part of the electric polarization field in…
Abstract Trichloroacetic acid catalyzed condensation of an aldehyde carrying more than two formyl groups and 3,5-di-tert-butylbenzaldehyde with bis(3-ethyl-4-methyl-2-pyrrolyl)-methane in acetonitrile followed by p-chloranil oxidation gave oligomeric porphyrins in good yield via multiple porphyrin-cyclization.
A theory of the energy exchange between valence electrons and ions in the dense displacement cascades in metals is proposed. It is shown that the theory based on the relaxation of the nonequilibrium electron-ion system gives a common basis for the electronic stopping power of slow ions due to valence electrons and for…
In order to assess the aluminium binding ability of humic and fulvic acids, important organic soil constituents, a pH-potentiometric study was made of the proton and aluminium(III) complexes of various bi-, tri- and tetradentate catechol and salicylic acid derivatives at 25°C and at an ionic strength of 0.20moldm−3 (K…
Surface hydrophobicity has recently been emphasized as an important parameter for functional correlation of proteins. However, evaluations of the parameter by different experimental techniques often do not correlate well with each other. In this paper we have compared surface hydrophobicity of a basic protein with tho…
Polymerizations of racemic- and meso-d,l-lactide were conducted at 120°C in xylylene or in bulk. Lead oxide (PbO), zinc stearate, antimony(III) 2-ethylhexanoate, and bismuth(III) 2-ethylhexanoate were used as initiators. With PbO and Zn stearate, bulk polymerizations were also conducted at 150°C. High yields (⩾90%) we…
Abstract A method for the synthesis of well‐defined poly(alkyl vinyl ether–2‐ethyl‐2‐oxazoline) diblock copolymers with hydrolytically stable block linkages has been developed. Monofunctional poly(alkyl vinyl ether) oligomers with nearly Poisson molecular weight distributions were prepared via a living cationic polyme…
High molecular weight, amorphous, partially substituted polyacetylenes (poly-RCOT) have been prepared using the ring-opening metathesis polymerization of substituted cyclooctetraenes. Spin-cast films of these polymers yielded unusually sharp, well-defined reversible electrochemistry for oxidative and reductive doping…
Abstract For the two groups of rubber modified thermoplastics (toughness by multiple crazing as in HIPS and ABS polymers or by multiple shearing as in high‐impact PA) the local processes of plastic deformation have been studied by different techniques of electron microscopy, including scanning, transmission and high v…
Using neutron diffraction, we have studied the crystal structure and magnetic ordering of the rare-earth and Cu moments in the layered perovskite systems ${\mathrm{NdBa}}_{2}$${\mathrm{Cu}}_{2}$${\mathrm{NbO}}_{8}$ (Nd 2:2:1:8) and ${\mathrm{PrBa}}_{2}$${\mathrm{Cu}}_{2}$${\mathrm{NbO}}_{8}$ (Pr 2:2:1:8). These are sy…
Abstract A method is described to impart flexibility and mechanical strength to conducting polyaniline by polymerizing aniline on fabrics and on cellulose papers. The study indicates that these conducting fabrics offer 16–18 dB of shielding effectiveness for the control of electromagnetic interference (EMI) up to a fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 5. Anionic polymerizations of 2-, 3-, and 4-cyanostyreneTakashi Ishizone, Kenji Sugiyama, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1993, 26, 12, 3009–3018Publication Date (Print):June 1, 1993P…
Solid-state alpha-track detectors using cellulose nitrate films were used to measure the radon exhalation rates from building materials. The radon flux emitted from the surface of the building material was measured by placing an inverted cup on the top of the building material. Cellulose nitrate film was placed within…