PREPARATION OF FUNCTIONALIZED ALKOXYAMINE INITIATOR AND ITS USE
申请人:——
公开号:US20030236368A1
公开(公告)日:2003-12-25
A one-pot process for the preparation of functional alkoxyamines of the general formula (I),
1
is disclosed. The process entails (1) reacting an oxidizing agent with a sterically hindered secondary amine to produce an aqueous phase and a nitroxyl radical (2) removing the aqueous phase and adding to the nitroxyl radical one or more vinyl monomer(s) conforming to a formula and a system which produces free radicals. Also disclosed is a process of polymerizing monomers using the functional alkoxyamine.
In-situ polymerization of monoethylenically unsaturated monomers with secondary amines
申请人:——
公开号:US20040122270A1
公开(公告)日:2004-06-24
A process for the preparation of any of well-defined homopolymers, random and block copolymers is disclosed. The process that entails forming a mixture of monomers, a hindered secondary amine and an oxidizing agent is characterized in the absence of any additional free-radical initiator.
Process for the synthesis for alkoxy amines and their use in controlled radical polymerization
申请人:——
公开号:US20040002606A1
公开(公告)日:2004-01-01
A one-pot process for the preparation of alkoxyamines conforming to formulae (I) or (II), preferably (I)
1
is disclosed. The process entails (1) reacting of an oxidizing agent (A) with a sterically hindered secondary amine of the general formula (III),
2
in a water-containing medium to form a reaction product and an aqueous phase, (2) removing of the aqueous phase, and (3) (adding to the reaction product a free-radical initiator (B) under conditions that promote the decomposition of the initiator to generate free radicals. Also disclosed is a process for polymerizing monomers, the process using the alkoxyamine prepared by the inventive process.
the desired product was affected by the presence of a complex reaction network involving several kinetically parallel and consecutive reactions, leading to by-products such as diacetonealcohol, diacetoneamine, mesityl oxide, acetonine, and 2,2,4,6-tetramethyl-2,5-dihydropyridine. The latter was the most undesired by-product, since its formation was irreversible. Key elements in achieving high selectivity
8–14 by a retro-Diels-Alder reaction under flash thermolytic conditions. The primaryenamines 1–4 have been identified (IR, 1H and 13C NMR) in a pure state at −80°; at the same temperature, the enamines 5–7, less stable, are already accompanied by their tautomericimines 33 or 34. When warmed up to room temperature, the enamines 1–7 lead, following to their substitution, either to nitrogen heterocycles