Abstract In this research, the effect of (3-Aminopropyl) triethoxysilane (APTES) modified Fe3O4 (Fe3O4@APTES) core-shell nanomaterials as the recyclable heterocatalyst on the recovery of bisphenol-A (BPA) from hydrolysis of polycarbonate (PC) wastes were investigated. In the evaluated reactions, water and diethylene glycol (DEG) were used as the green solvent composition and the water as well as magnetic heterocatalyst content were optimized. By examining the results of the above-mentioned reactions, it was observed that by using 25 pbw of water and 2 pbw of magnetic heterocatalyst (both based on total waste and solvent weights), BPA achieved in 100% yield. The Fe3O4@APTES nanomaterials as the heterocatalyst can be recovered and reused up to five intervals with our significant activity losses. The resulting BPA and nanomaterials has been characterized by X-ray diffraction (XRD), and spectroscopic methods (1H NMR, 13C NMR, FT-IR).

Resumen En esta investigación, el efecto de (3-aminopropil) trietoxisilano (APTES) modificó los nanomateriales de Fe3O4 (Fe3O4@APTES) como heterocatalizador reciclable en la recuperación de bisfenol-A (BPA) de hidrólisis de policarbonato (PC). En las reacciones evaluadas, se utilizaron agua y dietilenglicol (DEG) como la composición del disolvente verde y se optimizó el contenido de agua y de heterocatalizador magnético. Al examinar los resultados de las reacciones mencionadas anteriormente, se observó que al usar 25 pbw de agua y 2 pbw de heterocatalizador magnético (ambos basados en residuos totales y pesos de solventes), el BPA alcanzó un rendimiento del 100%. Los nanomateriales Fe3O4@APTES como heterocatalizador pueden recuperarse y reutilizarse hasta cinco intervalos con nuestras importantes pérdidas de actividad. El BPA y los nanomateriales resultantes se han caracterizado por difracción de rayos X (XRD) y métodos espectroscópicos (1H RMN, 13C RMN, FT-IR).

Abstract The aim of this research work is focused on the improvement of Terephthalic acid recovery from PET wastes by using organically modified nano-Fe3O4@Cyanuric Chloride as the solid support. The performance of organically modified nano magnetic was examined in detail and the obtained results were compared with the unsupported reaction data. Required reaction time for complete glycolysis of the wastes, consumption of the solvent as well as catalyst decreases up 99%, 37.5% and 40% respectively. Result showed that nano-Fe 3O4@Cyanuric Chloride delivered good performance as solid support in depolymerizing of PET to the terephthalic acid.

Abstract Iron oxide magnetic nanoparticles (NP's) converted to the core- shell structres by reacting with by n-(2-aminoethyl)-3-aminopropyl trimethoxysilane (AEAP) incorporated in polyurethane flexible (PUF) foam formulations. Fourier transform spectra, thermal gravimetric analysis, scanning electron images, thermo-mechanical analysis and magnetic properties of the prepared nanocomposites were studied. Obtained data shown that by the increasing of the amine modified magnetic iron oxide NP's up to 3% in the polymer matrix, thermal and magnetic properties improved in comparison with pristine foams. In addition, due to the presence of functional groups on the magnetic NP's surface, hard phases formation decrease in the bulk polymer and cause decreasing of glass transition temperature.

A simple method is reported for the epoxidation of hydroxyl-terminated polybutadiene (HTPB) by using in-situ generated dimethyl dioxirane (DMD) as an oxidant and Cloisite 15Aº nanoclay as a phase-transfer catalyst (PTC). In order to find the optimum reaction conditions, real time analyses of the products as well as epoxidation progress, followed by ¹HNMR and FTIR techniques at various reaction times and different PTC concentrations, were done. Obtained data revealed the selectivity of DMD/ Cloisite 15Aº in predominant cis double bonds epoxidation in comparison with trans and pendant vinyl functional groups.

Hydroglycolysis of polycarbonate waste from used compact discs was developed to recover Bisphenol-A (BPA) as a valuable material. Experiments were done in glycerin and water as an alternative green solvent. The effect of solvent ratios has been studied to evaluate BPA recovery. The use of 30% aqueous glycerin (pbw) led to 93 and 100% of BPA at reflux condition within 1.0 and 5.5 hours, respectively. Recovered BPAs were identified by spectroscopy methods and the results were compared with commercial sample data.