Poly microanalysis

Taubert, A. Winey, K.I. Imaging and x-ray microanalysis of a poly(ethylene-ran-methacrylic acid) ionomer melt-neutralized with sodium. Macromolecules 2002, 35, 7419. 

The Fe-Au nanoparticles were reported to consist of metallic cores, having an average diameter of 6.1 nm, surrounded by an oxide shell, averaging 2.7 nm in thickness, for a total average particle diameter of 11.5 nm [101]. A surfactant solution is prepared with nonylphenol poly(ethoxylate) ethers. Au-coated Fe nanoparticles were also prepared in a reverse micelle formed by cetyltrimethylammonium bromide (CTAB), 1-butanol and octane as the surfactant, the co-surfactant and the oil phase, respectively [100]. The nanoparticles were prepared in aqueous solutions of micelles by reduction of Fe(II) and Au precursors with NaBH4. The typical size of the nanoparticles is about 20 nm. The existence of Fe and Au is again confirmed by energy dispersive X-ray microanalysis. 

Figure 4.25. (a) The mutual diffusion coefficient in the miscible polymer blend poly(vinyl chloride)-polycaprolactone (PVC-PCL) at 91 °C, as measured by x-ray microanalysis in the scanning electron microscope (Jones et al. 1986). The solid line is a fit assuming that the mutual diffusion coefficient is given by equation (4.4.11), with the composition dependence of the tracer diffusion coefficient of the PCL given by a combination of equations (4.4.9) and (4.4.10). The tracer diffusion coefficient of the PVC is assumed to be small in comparison, (b) The calculated profile of diffusion between pure PVC and pure PCL, on the basis of the concentration dependence of the mutual diffusion coefficient shown in (a). The reduced length u — where the... 

Figure 12.11 (35) illustrates the SIMS spectrum of poly(ethylene tereph-thalate). The protonated repeat unit is seen at 193 g/mol, and peaks at lower masses represent fragmentation with dominant peaks at 149 g/mol (HOOC— CfiH,—CO ), 104 g/mol (CgHtCO ), and 77 g/mol (CeHsO- SIMS can be used for microanalysis of polymer surfaces. In one case (35) the experiment was used to detect the presence of dimethyl siloxane contamination on the surface of the polymer. 

The reactions (a) and (b) lead to the formation of poly(vinyl ketone) (3) as a final product of oxidation of the substrate. Poly(vinyl ketone) was isolated and identified by microanalysis and spectral data [207]. 

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