One‐step functionalization of an ethylene/propylene random copolymer with two different reactive groups

Abstract

ABSTRACT:The efficiency of a macromolecular compatibilizer for reactive blending is strongly dependent on its potentiality of producing a grafted or block copolymer during processing. For the preparation of such a compatibilizer, the grafting of two different reactive groups onto the backbones of ethylene/propylene copolymer macromolecules was performed. The ethylene/propylene (70/30) copolymer was then processed in a Brabender mixer at 190°C in the presence of a mixture of maleic anhydride and diethylmaleate with either dicumyl peroxide or di-tert-butyl peroxide as an initiator. The experiments clearly showed that the two functionalities, 2-diethyl succinate and 2-succinic anhydride, could be grafted in one step. The effect of the feed composition demonstrated that the two monomers influenced the reciprocal reactivity and the resulting product. A detailed Fourier transform infrared analysis of the grafted macromolecules was performed, and the respective amounts of ester and anhydride derived groups were detected by deconvolution of the vibrational bands in the carbonyl spectral region. The validity of the process on an industrial scale was tested by the successful performance of the reaction in a twin-screw extruder.

Effect of Structure of Functionalizing Molecules on the Inter‐Macromolecular Reactions and Blending of Poly(ethylene‐co‐propylene) (EPM) with Poly(6‐aminohexanoic Acid) (PA6)

“…Probably during blending, MEM was converted into the more reactive maleic anhydride prior to the grafting [15] [16]. However, the approximated FD was higher for lower MEM/DCP ratios (obtained by increasing the amount of DCP at constant amount of MEM), in agreement with results obtained for polyolefins [13] [17 -20].…”

“…The 1700 -1900 cm À1 range of the IR spectrum was analyzed by a deconvolution approach [8] [13]. In this case, we considered four bands due to the grafted groups and one due to the partial overlapping with the amide-I band (1640 cm…”

Funcionalización de polietileno de baja densidad con anhídrido maleico en estado fundido

“…El AM es el monómero más usado, debido a que es un poderoso receptor de electrones [11][12][13][14][15] . La reacción de funcionalización se lleva a cabo por radicales libres usando un peróxido como iniciador, por su baja volatilidad y buena solubilidad, y compatibilidad con las poliolefinas [1,4,16] . Las altas temperaturas generan radicales libres por la descomposición térmica del iniciador generándose así la abstracción de átomos de hidrógeno de la cadena del polímero y la adición del monómero insaturado [9,10] (Figura 1).…”

Interfacial effects on the dynamics of ethylene–propylene copolymer nanocomposite with inorganic clays

“…The poly(propylene-co-ethylene) CO-034 with 22.3 mol% propylene ( 1 H NMR spectroscopy) and 10% crystallinity (determined by DSC analysis) (Enichem Elastomeri, San Donato Milanese, Italy) was functionalized with diethylmaleate (DEM) by using a wellknown procedure reported in literature to obtain a functionalized product (EPM-g-DEM, FD (functionalization degree) = 1.4-1.5% by mole as evaluated by FT-IR and NMR spectroscopy [33] (Fig. 1).…”