No abstract

A B S T R A C TThe study of the new structures mainly useful in the synthesis of more efficient and selective new extractants led to the development of new series of macromolecules. Hence, in our present experiment, the expanded polystyrene packaging waste was chemically modified. Then, the functionalization of polystyrene recovered by the direct blending and grafting of a benzenic crown ether group was carried out. The obtained resins were characterized by elemental analysis, infrared spectroscopy, differential scanning calorimetry, differential thermal analysis, thermogravimetric analysis, and X-ray diffraction. The ability to extract metallic cations (Cr 3+ , Fe 3+ , Ni 2+ , Cd 2+ , and Pb 2+ ) contained in an aqueous solution was done by the grafted or ungrafted polymers by crown ethers. Obtained results showed higher extraction percentages for resin 4, thus, suggesting it had important extracting capacity compared with resin 3.

The aim of this work was to study the structural and electrical properties of a new polymer obtained by functionalization of a commercial poly(vinyl chloride) (PVC) (Mw = 48000) by grafting aminoalkyl and aminoaryl groups. Modified poly(vinyl chloride) was prepared in two steps. The structural properties of the polymer were systematically investigated by varieties of techniques as differential scanning calorimetric (DSC), thermogravimetry analysis (TG), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. The electrical properties of the polymer were studied by electrochemical impedance spectroscopy (EIS).

In order to remove metals (Zn & Mg) located in wastewater, a new series of clickable polystyrene Merrifield grafted with azide and alkynes were synthesized and implicated in this domain. In a first step, we transformed the polystyrene Merrifield into the known Azidomethyl polystyrene, in a second step, a coupling reaction between the Azidomethyl polystyrene and dipropargylamine was realized for the synthesis of a new terminated polystyrene alkyne containing one unit of (1,4)-triazole. To increase the length of the chain grafted on the polystyrene Merrifield, several coupling reactions are applied, the main idea of this work was to increase the number of (1,2,3)-triazole units of this grafted chain. The click chemistry based on the Huygens's reaction catalyzed by copper (I) was used in this synthesis, the new polymers containing (1,4)-disubstituted triazole are tested for the extraction of Mg and Zn located in wastewater. The structure of new obtained polymers was confirmed by infrared spectroscopy (ATR-FTIR), UV-visible spectroscopy and elemental analysis for nitrogen. Differential Thermal Analysis (DTA) and Thermo Gravimetric Analysis (TGA) were used to study crosslinking behavior of these polymers. This study shows a low selectivity of studied polymers for the retention of magnesium, while for the Zinc, the percentage removal was average, it's in the order of 30%.

No abstract