Materials Literature
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A sphere-type fully substituted oligosaccharide−β-alanine−poly(lysine) dendrimer having a sharp molecular weight distribution was synthesized. Sphere-type poly(lysine) dendrimers were prepared using 1,4-diaminobutane as an initiator core and N,N ‘-bis( tert -butyloxycarbonyl)- l -lysine as a branching unit. β-Alanine…
Abstract An Erratum has been published for this article in Journal of Polymer Science Part A: Polymer Chemistry (2003) 41(23) 3862 A new series of combined‐type, azobenzene‐based organophosphorus liquid‐crystalline polymers were synthesized, and their photoisomerization properties were studied. The prepared polymers c…
Lanthanum-doped intergrowth ferroelectrics, (Bi,La)4Ti3O12–Sr(Bi,La)4Ti4O15 [BLT–SBLT(x)], have been prepared. It is found that the remnant polarization (2Pr) of Bi4Ti3O12–SrBi4Ti4O15 (BIT–SBTi) is enlarged. The 2Pr of BLT–SBLT(0.50) has a maximum value of 25.6 μC/cm2. Assuming that the Curie temperature of BLT–SBLT(x…
A sequence of field-induced phase transformations was observed by means of a polarizing microscope on a (111)-cut single crystal Pb(Mg1/3Nb2/3)0.67Ti0.33O3 at room temperature with an electric field applied along the [111] direction. As electric field increases, polarizations of the rhombohedral R domains whose polar…
For linear systems in the continuum in which the particles interact with nearest-neighbor forces, the pair distribution function at short distances can be expressed exactly in a simple form. Results are given for various hard-core interaction potentials, in which the attractive potential is either constant (square-wel…
Energy-filtered quantitative electron diffraction at liquid nitrogen temperature has been used to examine the atomic structure and bonding of metastable alpha-Cu phthalocyanine crystals. Three theoretical methods (kinematic, kinematic with excitation errors and Bloch wave) were employed for the intensity calculations.…
We present a detailed angle-resolved photoemission study of the electronic structure of layered $1T\ensuremath{-}{\mathrm{TaSe}}_{2}$ in the commensurate charge-density-wave (CDW) phase. A considerable reduction in the spectral weight of a quasiparticle band centered at the binding energy of about 0.25 eV below the Fe…
The mechanical behaviour of carbon nanotubes is one of the basic research fields on the nanotube composites and nano machinery. Molecular dynamics is an effective way for investigating the behaviour of nano structure. The compression deformation of carbon nanotubes (CNTs) under different temperature is simulated, by u…
Abstract Novel polymeric azomethines of 5,5′‐methylene‐bissalicylaldehyde with two siloxane diamines {H 2 N(CH 2 ) 3 (CH 3 ) 2 SiO[(CH 3 ) 2 SiO] m Si(CH 3 ) 2 (CH 2 ) 3 NH 2 , where m = 0 or 6.5} were obtained. Their structures were confirmed by elemental and spectral [IR, ultraviolet–visible (UV–vis), and 1 H NMR] a…
A new Landau free energy is derived for diblock copolymers of incompatible pairs based on the recently developed compressible random-phase approximation analysis. Finite compressibility of each block is generally allowed. The inhomogeneity of each block density and free volume is analyzed in the weak segregation regim…
A combination of NMR and MALDI was found to be a suitable tool to study the exchange reactions that occur during the melt mixing of Nylon-6 and poly(butylene terephthalate) (Ny6/PBT) blends. The results reveal the essential role of carboxyl end groups in the exchange reaction, and allow drawing a detailed mechanism fo…
We consider the micellization of block copolymers in solution, employing self-consistent field theory with an additional constraint that permits the examination of intermediate structures. From the information for an isolated micelle (structure, binding energy, free energy) we describe how the global thermodynamics of…
The Bacillus subtilis proteins involved in the utilization of L-arabinose are encoded by the araABDLMNPQ-abfA metabolic operon and by the araE/araR divergent unit. Transcription from the ara operon, araE transport gene and araR regulatory gene is induced by L-arabinose and negatively controlled by AraR. Additionally,…
Ring-opening polymerization of ε-caprolactone has been initiated by Y isopropoxide grafted onto silica, in the presence of 2-propanol, in toluene at 40 °C. The degree of polymerization is controlled by the initial monomer/(alcohol + alkoxide) molar ratio. Deactivation of the chains by an alcohol is essential for them…
Atomic force microscopy was adopted to study the nanoscopic structure formation of natural fibrous protein, fibroin from the Samia cynthia ricini wild silkworm. We have observed highly ordered nanoscale textile-fabric-like structures of fibroin molecules. From AFM and SDS-PAGE experiments, it was revealed that fibroin…
Supercooled liquids in the Y 2 O 3 –Al 2 O 3 system undergo a liquid–liquid phase transition between a high-temperature, high-density amorphous polymorph (HDA form), and one with lower density that is stable at lower temperature (LDA form). The two amorphous polymorphs have the same chemical composition, but they diff…
The configurational entropy Sc, which is a basic quantity in theoretical descriptions of the glass transition, is evaluated for a multicomponent polymer system using the lattice cluster theory. This theoretical treatment of Sc represents an extension of the Gibbs–DiMarzio theory to a mixture of semiflexible, interacti…
The binding and reversibility of Thermobifida fusca intact Cel5A, Cel5B, and Cel48A and their corresponding catalytic domains (CDs) to bacterial microcrystalline cellulose (BMCC) were studied at 5 degrees C. The binding of the intact cellulases and of corresponding CDs to BMCC was irreversible in all regions: Langmuir…
9R9. Mechanics of Solids and Shells: Theories and Approximations. - G Wempner (Georgia Inst of Tech, Atlanta GA) and D Talaslidis (Aristotle Univ, Thessaloniki, Greece). CRC Press LLC, Boca Raton FL. 2003. 529 pp. ISBN 0-8493-9654-9. $119.95.Reviewed by J Petrolito (Sch of Sci and Eng, La Trobe Univ, PO Box 199, Bendi…
The use of two orthogonal, external fields is shown to control the orientation of lamellar microdomains in three dimensions in diblock copolymer thin films. An elongational flow field was applied to obtain an in-plane orientation of the microdomains of the copolymer melt, and an electric field, applied normal to the s…