High-disperse mixture

The authors [2] found, that in case of high density polyethylene (HDPE), modified by high disperse mixture Fe/FeO (Z), is observed strong extreme rise of stability to cracking expressed by the time up to fracture t50. So, if for the initial HDPE normative value Tsq.is equal to 10 hours, then for composition HDPE+Z with content Z Cz=0.05 mass.% the value t50 reaches 250 hours. The purpose of the present paper is the explanation of this important... 

It is shown that the applicability of fractal model of anomalous diffusion for quantitative description of thermogravimetric analysis results in case of high density polyethylene modified by high disperse mixture Fe/FeO (Z). It is shown the influence of diffusion type on the value of sample 5%-th mass loss temperature and was offered structural analysis of this effect. The critical content Z it is determined, at which degradation will be elapse so, as in inert gas atmosphere. 

Let us consider the Eq. (30) application for the description of melt viscosity of HDPE, modified by the high-disperse mixture Fe/FeO(Z). The compositions HDPE+Z melt viscosity was defined as reciprocal of MFI, that is, according to the Eq. (1). The coefficient c in the Eq. (30) was determined as follows [53] ... 

Machukov, N. I., Gladyshev, G. R, Kozlov, G. V. (1991)l Stracture and Properties of High Density Polyethylene Modified by High-Disperse Mixture Fe and FeO. Vysoko-molek. Soed. A, 33(12), 2538-2546. 

Hence, the adduced above results have shown that polyethylenes samples fracture criterion in tests on cracking under stress in active mediums is polar liquid reaching of sample median plane. The stability to cracking is described correctly within the frameworks of fractal model of transport in polymers. The stability to cracking extreme growth cause is structural changes, which are due to high-disperse mixture Fe/FeO introduction and characterized by dimension D. ... 

Let us consider now the reason for percolation linear model choice. As it has been shown in Ref. [34], for samples of HDPE, modified by high-disperse mixture Fe/FeO(Z) at Z content 0.05 mas.% the extreme Uincrease up to -0.78 J is observed, accompanied by shear transvers band at notch tip appearance. Thus, two side and one transverse bands of shear are formed closed arch-like construction, forming actually the linear percolation in the indicated above sense by sample width. Despite small increase for side bands of shear and small value for transverse band of shear (-0.5 mm), the sharp increase U in the indicated compositions HDPE+Z is observed. 

The reason for this relationship is not clear, but as there is poor interaction between the solutes and methanol due to their highly dispersive character, they may need to interact with two methanol molecules in order to become sufficiently solvated to disperse in the aqueous mixtures. 

The more dispersive solvent from an aqueous solvent mixture is adsorbed onto the surface of a reverse phase according to Langmuir equation and an example of the adsorption isotherms of the lower series of aliphatic alcohols onto the surface of a reverse phase (9) is shown in figure 9. It is seen that the alcohol with the longest chain, and thus the most dispersive in character, is avidly adsorbed onto the highly dispersive stationary phase, much like the polar ethyl acetate is adsorbed onto the highly polar surface of silica gel. It is also seen that... 

Since the values of the unit cell parameter of the acidic salts were not intermediate between those of the neutral salts and of the parent acid (ao = 1.216 and 1.217 nm, respectively, for H3PWX2O40 and H4SiWi204o), one may propose that there is no formation of solid solutions but rather a mixture of the neutral salt and of the acid highly dispersed on the neutral salt. 

Pt particles remain highly dispersed in the reaction mixture during mesostructure formation. All measurements including XRD, SAXS, and TEM indicate a well-ordered silica structure. N2 physisorption measurement indicated high surface areas (523-661 m g ) and meso-sized pores (112-113 A) for the silica supports produced in the presence of different Pt particles. 

Pt-Ru anodes for methanol electrooxidation The catalytically most active samples are highly dispersed and contain, as indicated by the Mossbauer data, a mixture of two Ru(IV) species... 

The high sensitivity of the reaction to particle size of Rh is confirmed at 230°C, in a mixture of 0.5% NO+1% CO, the turnover frequency increases from 0.017 s-1 for a highly dispersed catalyst to 0.74 s 1 for a catalyst dispersed at 1.7%, the activity per metal site on unsupported Rh catalysts being still much higher. 

With nickel/alumina catalysts (cf. 4 ) preparation by coprecipitation or by the decomposition of a high dispersion of nickel hydroxide on fresh alumina hydrogel, yields nickel aluminate exclusively. On the other hand, when, as in impregnation, larger particles of nickel compound are deposited, the calcination product is a mixture of nickel oxide and nickel aluminate. The proportion of nickel oxide increases when occlusion of the impregnation solution leads to a very nonuniform distribution (49). 

More recently, microwave chemistry has also been used to achieve covalent functionalization. In particular, these treatments can functionalize CNTs with sulfonated and carboxylic groups using a mixture of nitric and sulfuric acid under microwave radiation for 3 min, thus resulting in highly dispersible CNTs in ethanol and water... 

Various methods [282] have been used to prepare anhydrous chlorides of the rare earths. Taylor and Carter [283] describe a general method for the preparation of high purity anhydrous halides in good yield. This method involves heating in vacuo, a molecularly dispersed mixture of hydrated rare earth halide with proper ammonium halide until the water and ammonium halide are expelled. All the trihalides except the iodides of Sm and Eu can be obtained using this proceedure. In the case of Sm and Eu the divalent iodides, Sml2 and Eul2 are obtained. 

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