Properties Investigation

The results of sorptional properties investigation have shown the possibility of SN-SiO, application for Pb +, ClC+, Zn +, Cd + selective preconcentration. The preconcentrated Cu, Pb, Cd, Zn ions at pH 6-7 were eluted by acid and determined by atomic-absoi ption method. 

In this chapter physical properties of solids at finite strain within their purely elastic ranges will be investigated. Although the strain levels of a few percent are small relative to the total compressions of typical shock-compression studies, they are large compared to those typically encountered in higher-order elastic property investigations. 

Heats of formation, molecular geometries, ionization potentials and dipole moments are calculated by the MNDO method for a large number of molecules. The MNDO results are compared with the corresponding MINDO/3 results on a statistical basis. For the properties investigated, the mean absolute errors in MNDO are uniformly smaller than those in MINDO/3 by a factor of about 2. Major improvements of MNDO over MINDO/3 are found for the heats of formation of unsaturated systems and molecules with NN bonds, for bond angles, for higher ionization potentials, and for dipole moments of compounds with heteroatoms. 

The copper(I) analogue [Cu(L)][C104] (744) (distorted tetrahedral) of copper(II) complex (201) was also synthesized and its redox property investigated.193 Structuresof complex (745) (distorted tetrahedral)557 and complex (746) (pseudotetrahedral Cu-Cu 4.764 A)558 were also reported. 

The silicon-carbon double bond has attracted the attention of theoretical chemists who have now performed a large number of high quality calculations on various properties of siienes. It is gratifying to observe that there is close agreement between experiment and calculation in most properties investigated, as summarized below. 

B = molybdocene(IV) dithiol (70b). The solitaire porphyrazines exhibited rich redox chemistry, and could be oxidized with ferrocenium hexafluorophosphate to yield the paramagnetic Mo(V) species H2[pz(A3B)], A = di -ferf-butyl phenyl, B = molybdocene(V) dithiol (72a) and H2[pz(A3B)], A = dipropyl, B = molybdocene(V) dithiol (72b), which were studied by EPR (Scheme 13). Additionally, 70a was centrally metalated with Cu(II), to form Cun[pz(A3B)], A = di-ferf-butyl phenyl, B = molybdocene(IV) dithiol (71), which was then oxidized to Cun[pz(A3B)], A = di-terf-butyl phenyl, B = molybdocene(V) dithiol (73) and its magnetic properties investigated. 

From the above results, it is noted that the self-similar scaling property investigated by the triangulation method can be effectively utilized to analyze the diffusion towards the self-affine fractal interface. This is the first attempt to relate the power dependence of the current transient obtained from the self-affine fractal curve to the self-similar scaling properties of the curve. 

Multilayer Langmuir-Blodgett films doped with a cyanine dye have been deposited on the surface of a quartz multimode optical fiber and the fluorescence properties investigated. 49 The fluorescence intensity of the films was found to be a periodic function of the number of layers due to the waveguide properties of the films. 

In spite of this wide applicability, a survey of the literature reveals that, compared to ionic and non ionic surfactants, there have been relatively few investigations of their surface and thermodynamic properties. Investigation has been hampered by the nonavailability of pure compounds and proper analytical techniques to determine their concentration in solution. 

Foams were prepared from blends of EVA and ethylene-styrene interpolymers having styrene contents ranging from 30 to 73 wt.% and Tgs ranging from -2 to 33C, in the presence of various amounts of dicumyl peroxide and their viscoelastic and mechanical properties investigated. The effects of styrene content and peroxide concentration on the morphology, degree of crosslinking and expansion ratio of the foams were assessed as was the influence of the type of ethylene-styrene interpolymer on the Tg of the foams. It was found that the Tg of the blends could be tailored by selection of the appropriate interpolymer. 19 refs. 

The results are reported of a study of the effect of several glycerol ester ageing modifiers used to regulate the isobutane/air interchange on the properties of extended LDPE foams. Properties investigated included dimensional stability, electrostatic decay and mb-off of excess wax at the surface of the foam. Comparisons are made with the non-glyceride modifier, stearamide. 4refs. USA... 

Because polymeric materials are expected to perform under a variety of temperature conditions, thermal properties are important. Thermal property investigations can also allow better design of materials that meet the thermal requirements and may also give added structural data. 

A library of random copolymers comprised of MeOx, EtOx, and NonOx has been established, and the properties of the members have been studied [88], Systematic copolymerization studies and corresponding structure-property investigations have been performed in detail by Schubert et al. For this purpose, nine copolymers were synthesized with 0-100 mol% (steps of 12.5 mol%) of the second monomer, resulting in 27 polymerizations for three different combinations of MeOx, EtOx, and NonOx. The monomer conversion was followed by GC measurements. As shown in Fig. 16, the content of the second monomer increases linearly with increasing mole fraction of the second monomer, whereas the content of the first monomer decreases linearly. 

From the beginnings of imino sugar research and application, such lipophilic modifications as AA alkyl derivatives of 1-deoxynojirimycin and its relevant epimers have been prepared and their properties investigated. These amphiphilic compounds... 

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