Preparation of alternating olefine maleic anhydride copolymers from C4C6 hydrocarbon mixtures formed in petrochemical cracking units

Abstract

EXPERIMENTAL, MaterialsMaleic anhydride (purum, m.p. 53"C, Fluga AG) was used without further purification. Lauroylperoxide (LPO), a commercial product from Luperox GmbH with the following properties was used; the peroxide concentration 98%, the active oxygen content 3.93% and the half life tllz., in 0.2 mol benzene solution; 10 h/62"C, 1 h/ 80°C and 1 min/ 120°C. Zmethyl-1,Sbutadiene (isoprene) (purum), dioxane (purum), and toluene (anal. grade) were from Fluga AG and were used without further puriiication. C4-C6 hydrocarbon mixtures used in the experiments dere obtained

DFT Modeling of the Alternating Radical Copolymerization and Alder-Ene Reaction between Maleic Anhydride and Olefins

“…To date, MAC with ethylene [2,3], isobutylene [4][5][6] and styrenes [7,8] are synthesized and structurally characterized, alternating microstructure of these copolymers was confirmed by spectral methods [3,9,10]. MA copolymers with linear α-olefins are usually attributed to alternating copolymers [1,[11][12][13][14][15][16] (Scheme 1), however these macromolecules are regarded as statistic in Recently we performed copolymerization of MA with methylenealkanes RC(=CH 2 )CH 2 CH 2 R that are close structural analogs of isobutylene [46]. The ratio of comonomers in the products of copolymerization was~1:1 (by 1 H NMR and elemental analysis).…”

Polymer Cold-Flow Improvers for Biodiesel

“…Copolymers of MA with donor monomers are usually attributed to alternating copolymers [ 138 , 139 , 140 , 141 , 142 , 143 , 144 ], and the preference of the formation of alternating sequences in free-radical copolymerization of MA with different olefins was confirmed by the density functional theory (DFT) simulations [ 145 ]. The wide spectra of the functional derivatives of MA copolymers are considered as highly efficient depressor additives and flow improvers for petroleum fuels [ 146 , 147 , 148 ].…”