No abstract

In this study RuO~/TiO2 mixtures were prepared from solution using Ti(i-OPr)4 and three different precursors for RuO2, RuNO(NO3)3, and RuC13 9 xH20 and tris (2, 4-pentanedionate) Ru(III). Multi-layer coatings were deposited by spin coating onto fused silica slides with and without an intermediate, 200 nm thick, vacuum deposited Ti film. Samples heat treated at 200, 300, and 400~ were studied by several techniques (Rutherford backscattering spectrometry (RBS), elastic recoil detection, (ERD), nuclear reaction analysis (NRA), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (Y'rIR), and x-ray diffraction (XRD) to characterize morphological and compositional changes and to test the reproducibility of the preparation method. In all cases a single crystalline phase, the solid solution of the two component oxides, was detected by XRD. The films appeared to have a low density, and hydrogen and carbon were still found in the coatings after each heat treatment; their content was reduced only at 400~ for samples B and C. The surface of the films displayed increasing percentages of TiO2.

In this paper we present the synthesis and the characterization of cyclophosphazenes substituted with allyl groups, their transformation in epoxide-containing cyclophosphazenes and the final utilization of these compounds as chain extenders in combination with polyamides. The reaction at high temperature of Nylon-6 with epoxy-functionalized cyclophosphazenes leads to the opening of the epoxy units by the action of both amino (-NH2) and carboxylic (-COOH) end-groups of the polymer to enhance the final molecular weight of this material. The consequences of this fact on the thermal, mechanical and visco-elastic properties of treated Nylon-6 have been also evaluated and compared to those of the pristine material. Possible utilization of these cyclophosphazenes in recycling processes for degraded polyamides could be envisaged