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This thesis is devoted to the study of the dispersion polymerization of methyl methacrylate in supercritical carbon dioxide (scCO2), using a poly(dimethylsiloxane) macromonomer (PDMS macromonomer) as stabilizer. Supercritical fluids (SCF) and SCF mixtures ...
The present invention concerns an intermediate of the following formula I in which R 1 and R 2 represent independently of each other a C 1 -C 12 alkyl group, a (C 1 -C 12 alkoxy)carbonyl group, optionally substituted by one, two or three halogen atom, a (C ...
(2,6-Dichlorophenyl)trimethyl- and -triethylsilane exhibit untypical reactivity patterns toward strong bases. When treated at -100 DegC with lithium 2,2,6,6-tetramethylpiperidide, they give rise to two, with sec- or tert-butyllithium even three, different ...
This contribution reports on the synthesis of hyperbranched polylysines via thermal polymerization of L-lysine hydrochloride. Polymerization of L-lysine hydrochloride in the presence of one equivalent KOH at 150°C resulted in polymers with a number-average ...
Asym. substituted biaryldiphosphine ligands I (R1 = C1-6-alkyl or C3-10-cycloalkyl optionally substituted with one or more halogen atoms; R2 and R3 are equal and are C5-10-cycloalkyl or C1-6-alkyl, or R2 is C5-10-cycloalkyl or C1-6-alkyl, and R3 is aryl op ...
Provided is a process for prepn. of asym. substituted biaryldiphosphine ligands I (R1 = C1-6-alkyl, C3-10-cycloalkyl optionally substituted with one or more halogen atoms; R2, R3 = aryl, C5-10-cycloalkyl, C1-6-alkyl, or R2 = C5-10-cycloalkyl, C1-6-alkyl; R ...
A series of imidazolium dicarboxylic acids have been prepd. from the reaction of the 1,3-bis(carboxymethyl)imidazolium zwitterion with the Bronsted acids HX (X = F, Br, Cl, ClO4). The structures of these acids have been established in the solid ...
As the need for lower mol. wt. acrylates for specialty and molding applications increases, industry is looking for substitute prodn. processes. An alternative to the increasing of initiator and chain transfer agent concn. is working at higher temps. Howeve ...
L'émergence de procédés de gravure profonde performants (vitesse, anisotropie, uniformité…) de matériaux tels que le silicium (Si), la silice (SiO2) et certains polymères repose sur: • Le développement d'équipement de gravure permettant le contrôle indépen ...
A meso-tetraaryl ruthenium porphyrin complex having four polymerizable vinylbenzoxy groups (2) has been synthesized by reaction of pyrrole with 4-(vinylbenzoxy)benzaldehyde and subsequent metalation with [Ru-3(CO)(12)]. The porphyrin complex was immobilize ...
