Materials Literature
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Polysaccharides constitute a structurally diverse class of biological macromolecules with a wide range of physicochemical properties, which are the basis for the different applications in the broad field of pharmacy and medicine. Besides the classical applications of these biopolymers in industry and pharmaceutical pr…
Abstract Mesomorphism and the molecular orientation of 1,4‐phenylene bis{4‐(6‐(acryloyloxy)hexyloxy)benzoate} ( 1 ) and its derivative with a methyl‐substituent in the central phenylene group ( 2 ) are studied. The methyl group affects the transition temperatures and the thermodynamic parameters, but not the order par…
Abstract The influence of external mechanical stress on the nematic‐isotropic phase transformation of nematic elastomers was investigated. The experimental results of IR‐dichroism measurements in the nematic phase and stress‐optical measurements in the isotropic phase are in good agreement with the theoretical predici…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompact polymersHue Sun Chan and Ken A. DillCite this: Macromolecules 1989, 22, 12, 4559–4573Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue 1 December 1989https://pubs.acs.org/doi/10.1021/ma00202a031https://doi.org/10…
The recent item of news that appeared mainly in newspapers, journals, etc.; of the Canary Islands, in relation to the great deterioration which is detected in the concrete of aluminous cement. This is degenerative disease which is called ALUMINOSIS. This has taken us —precisely on account of the term ALUMINOSIS— to ti…
It is studied the influence of Fe, Al and Mg in the changes that have been produced by quench in the crystalline system of the alite and so it possible relation with the mechanical resistances.
The present paper corroborates, that experimental design technics are applicable to raw mix burnability investigations, and with it the obtained results could cover all the range of possible concentrations of industrial interest. Obtained results agree with theory. A negative interaction was found between lime saturat…
The colophony has been used as an admixture in the Portland cement mortar with the intention to observe its influence on the air content, water absorption, adhesive capacity and mechanical properties. The results obtained have shown that, the colophony acts as air entrainment, reduces the permeability and improves the…
It is shown that hydrodynamic interactions between non-Brownian, non-spherical, sedimenting particles give rise to an increase in the number of neighbouring particles in the vicinity of any given particle. This result suggests that the suspension is unstable to particle density fluctuations even in the absence of iner…
The effects of a forced flow on dendritic growth rate are studied theoretically. By using a solvability condition, one determines the eigenvalue C=${\ensuremath{\rho}}^{2}$V/${\mathrm{Dd}}_{0}$ as a function of the velocity of the forced flow in the two-dimensional model. Even in the presence of crystalline anisotropy…
(1989). SURFACE MODIFICATION OF POLYESTER BY ALKALINE TREATMENTS. Textile Progress: Vol. 20, No. 2, pp. 1-26.
Polarized and unpolarized neutron measurements have been performed on ${\mathrm{LaCoO}}_{3}$ in a temperature range between 10 and 295 K. A drastic decrease in the magnetic cross section is observed below 150 K. This is the first concrete experimental evidence for the temperature-induced magnetic moment of Co ions in…
A two-dimensional system of hard cyclic hexamers is shown to display an anomalous (negative) Poisson ratio in a high-density crystalline phase. The anomaly can be reproduced qualitatively by a simple free-volume (FV) approximation. The FV approximation and a lattice model indicate the crucial role of broken mirror sym…
X-ray powder patterns obtained from three different types of 35–40 Å CdSe nanoclusters are analyzed. We simulate the effects of thermal fluctuations, stacking faults, surface reconstructions, and bond compressions on powder patterns of CdSe clusters using the Debye formula. We find that the spectra of capped and annea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristics of the surface-induced orientation for symmetric diblock PS/PMMA copolymersThomas P. Russell, G. Coulon, V. R. Deline, and D. C. MillerCite this: Macromolecules 1989, 22, 12, 4600–4606Publication Date (Print):December 1, 1989Publication History Published onli…
The organization of apatite crystals and collagen fibrils in mineralized turkey tendon has been studied by electron microscopy and electron diffraction. To minimize artifactual distortions the tissue was examined, for the first time, as isolated fibrils in an aqueous environment of vitreous ice, as well as in conventi…
Abstract Poly(3‐hexylthiophene) (PT6), poly(3‐octylthiophene) (PT8), poly(3‐decylthiophene) (PT10) and poly(3‐dodecylthiophene) (PT12) were synthesized by electrochemical and chemical polymerization. Investigation of these polymers by means of gel permeation chromatography indicates that the polymers prepared from the…
Dielectric and pyroelectric properties of relaxor ferroelectric in the (1-x) Pb(Mg1/3Nb2/3)O3-xPbTiO3 solid solution series have been investigated. The dielectric constant (K) and loss of poled and unpoled ceramic samples were determined. The pyroelectric coefficient and the spontaneous polarization were measured by t…