Materials Literature
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Thermally induced packing correlations and apparent microphase spinodal boundaries are studied for conformationally asymmetric diblock copolymer melts using the “polymer reference interaction site model” (PRISM) theory. Microphase instabilities are deduced from predictions of the collective scattering intensities and…
A series of poly[methyl methacrylate (M)- b -styrene (S)- b -butadiene (B)- b -S- b -M], or MSBSM, pentablock copolymers have been successfully synthesized by sequential living anionic polymerization initiated with the diadduct of tert -butyllithium ( t -BuLi) onto m -diisopropenylbenzene ( m -DIB) in a cyclohexane/di…
A double-networked natural rubber (DNNR) was prepared by a “two-step crosslinking” method, in which the crosslinking was achieved while the natural rubber was in a stretched condition. The swelling behavior, tensile properties, creep, recovery, and permanent set were investigated. Generally, the observed mechanical pr…
The specimen size of concrete specimens should be large enough to be representative of the material. In this paper it is shown how the bundle bars method allows the dynamic mechanical characterisation by using the uniaxial elastic wave propagation theory used in the Hokinson bar technique.
Structures of six dimeric copper(II) benzoylformates (I)–(VI) have been determined by single-crystal X-ray diffraction and the magnitudes of the spin-exchange interaction ( H = −2 J S 1 S 2 ) have been determined based on the magnetic susceptibility measurement. (I): Tetrakis(\mu-benzoylformato- O , O ′)bis(pyridine)d…
In order to clarify aspects of dealloying and stress corrosion cracking of copper‐gold alloys, the electrochemical oxidation behavior of pure polycrystalline gold in 0.6 M NaCl and in 0.3 M Na 2 SO 4 solutions was studied using low‐scan rate cyclic potentiodynamic polarization, potential stepping, and scratching techn…
Other| August 01, 1997 The synthetic Cr 2+ silicates BaCrSi4O10; the missing links in the gillespite-type ABSi4O10 series Ronald Miletich; Ronald Miletich Universitaet Bayreuth, Bayerisches Geoinstitut, Bayreuth, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar David R. Allan; D…
Abstract A butyl methacrylate oligomer with furan end‐groups was synthesized by ozonolysing a poly(butyl methacrylate‐ co ‐butadiene) latex. The end‐groups of this oligomer were amidated with aminomethylfuran to give a coagulated mass of derivatized oligomers. This furan functional oligomer was then mixed with poly(et…
An applications of the molecular orbital (MO) calculation and Maeir-Meier theory to liquid crystal compounds are investigated for estimating dielectric anisotropy (δϵ). The method involves calculating the parameters on MO calculation and substituting these values into Maeir-Meier theory. These calculations are repeate…
Compounds based on 4,4'-substituted phenylbenzoate \[R O-C6H4COO-C6H4- X] (I), where X is a cyano group and R is a terminal alkyl chain ranging from 12 to 30 carbon atoms, and alternatively where R is held at 16 carbons and X is CN, COOH, OH, COOCH2C6H4, OCH2C6H4 and OC16H33, were prepared and their mesophase stabilit…
Measurements of the thermal expansion of a single crystal of ${\mathrm{La}}_{0.835}{\mathrm{Sr}}_{0.165}{\mathrm{MnO}}_{3}$ were performed under hydrostatic pressure of up to 9 kbar. The $P$-$T$ phase diagram is established for the structural and magnetic phase transitions. Pressure is found to enhance the ferromagnet…
Alumina–glass composites that contain oxidized aluminum were investigated to make shrinkage‐free, all‐ceramic dental porcelain. This was achieved by control of the volume expansion and shrinkage that occur during the aluminum oxidation and densification processes. The dimensional change and strength of the alumina‐gla…
ortant for the materials mentioned above, it may be very relevant for transition metals and other materials with a stress exponent different from m = 1. To investigate the implications of a stress exponent m?1 we study a simple two-dimensional model of the dislocation activity close to a semi-infinite crack in an infi…
Blends from poly(trimethylene carbonate) (PTMC) and poly(adipic anhydride) (PAA) with different compositions and different molecular weights were prepared by a solution blending method. Comparing blends with copolymers generally, the original degradation properties of the used components were changed through physical…
We report for the first time the results of theoretical study on the optical properties of single layer non-absorptive broadband cholesteric liquid crystals (BBCLC) polarizers. The objective of this study is to understand the effect of material parameters and sample configuration on the performake of BBCLC films and t…
Abstract It has long been the bane of analytical electron microscopy (AEM) that the use of focused probes during microanalysis of specimens increases the local rate of hydrocarbon contamination. This is most succinctly observed by the formation of contamination deposits (fig.l) during focused probe work typical of AEM…
Pure and doped (Benzophenone and Urea) triglycine sulphate (TGS) crystals have been grown from aqueous solution by slow cooling method. The influence of doping of benzophenone and urea on the growth and electrical properties have been investigated. The pyroelectric coefficient increases with the addition of benzopheno…
Ba 6 CoNb 9 O 30 and Ba 6 FeNb 9 O 30 in space group P 4 bm are shown to satisfy the structural criteria for ferroelectricity. Ba 6 CoNb 9 O 30 undergoes a diffuse phase transition at 660 (11) K, as observed calorimetrically, in addition to a dielectric permittivity anomaly with an onset temperature of 685 (10) K. The…
Abstract Treatment of a C222‐vanadyl‐AMP complex (C222 = cryptand‐222, AMP = adenosine monophosphate) with Me 2 NH in the presence of air yielded centrosymmetric dihydrogen‐decavanadate H 2 V 10 O 4 28 , sandwiched by two diprotonated C222 molecules. An X‐ray crystal‐structure analysis was performed of this compound w…
The desorption processes of adsorbed impurity ions on various alignment layers in nematic liquid crystal cells have been studied by measuring ac conductivity of the cells. The liquid crystal used here is 4-cyano-4′-pentyl biphenyl. The adsorption of the ions is induced by the application of dc voltage to the cells. It…