Slimani Mohammed Zakaria

Donostia International Physics Center | DIPC

Aziridines are known to undergo hydrolysis in the presence of cyclodextrins, whereas the latter are largely investigated as potential vectors of biologically active compounds. Despite this easy cyclodextrin-induced cleavage of aziridines in aqueous medium, it was of interest to find out a model aziridine derivative that would be sufficiently water-...

Aziridines are known to undergo hydrolysis in the presence of cyclodextrins, whereas the latter are largely investigated as potential vectors of biologically active compounds. Despite this easy cyclodextrin-induced cleavage of aziridines in aqueous medium, it was of interest to find out a model aziridine derivative that would be sufficiently water-...

By using dielectric spectroscopy, we investigate the chain dynamics of nonentangled polyisoprene (PI) under soft confinement in lamellar domains of block copolymer melts with polydimethylsiloxane (PDMS). The data show a dramatic difference in the end-to-end vector dynamics of the PI blocks as compared not only with that of the corresponding homopol...

We present computer simulations of concentrated solutions of unknotted semiflexible ring polymers. Unlike in their flexible counterparts, shrinking involves a strong energetic penalty, which favors interpenetration and clustering of the rings. We investigate the slow dynamics of the centers-of-mass of the rings in the cluster phase. Scattering func...

Phtaloylimidophenylalanyl-2-hydroxymethylaziridine has been used as a starting material to yield azomethine ylide through thermal opening and was then involved into 1,3-dipolar cycloaddition reactions. Different five-membered adducts were obtained and were fully identified. The latter might be considered useful starting materials for further functi...

By means of molecular dynamics simulations, we investigate the structural relaxation in disordered random copolymers and lamellar phases of gradient copolymers, containing chemical species of very different mobilities. Two models have been investigated: a generic bead–spring system and a MARTINI coarse-grained model of a polyester resin. The lamell...

We have performed simulations of a simple bead–spring model for cylindrical and spherical phases of diblock copolymers. We have analyzed in detail the dynamic heterogeneity of the structural α-relaxation of the component confined in the minority domains. In analogy with previous investigations on the lamellar phase of the same bead–spring model, th...

By means of computer simulations, we investigate the segmental dynamics in the lamellar phase of a simple bead–spring model of diblock copolymers. We characterize the dynamic heterogeneity in the mean-squared displacements and bond reorientations. This characterization is made as a function of both the position of the monomers along the chain and t...