Dihydroanthracene dimers as novel bifunctional initiators for anionic polymerization

Abstract

Anionic polymerizations initiated with an alkylene bridged dihydroanthracene dimer as a bifunctional initiator are described as a synthetic route to polymers containing the dianthryl species in the center of the macromolecular chain. The approach taken herein involves the twofold deprotonation of 1,3-di- (9,9 'J0,lO '-tetrahydro-9,9 '-anthry1)propane and the initiation of methyl methacrylate polymerization at both anionic sites.The synthesis ofABA block copolymers by addition of tert-butyl acrylate as a second monomer is described. Polymer analogous aromatization of the initiator generates the corresponding polymer with two anthracene units in the main chain. The synthezised homo-and block copolymers have been fully characterized by GPC, UV and NMR measurements.

Application‐directed syntheses of surface‐functionalized organic and inorganic nanoparticles

“…Acid hydrolysis of the tert ‐butyl ester gave the hydrophilic–hydrophobic–hydro‐ philic ABA triblock copolymer with a narrow and mono‐modal molecular weight distribution. BAB block copolymers have been prepared in a similar fashion, reversing the order of the monomer addition 189…”

Polymerization of Styrene-Butadiene Block Copolymers Using a Dicarbanion Initiator Made by the Reaction of Lithium with .alpha.-Methylstyrene

“…Styrene-butadiene block copolymers of the polyA-6Zoc&-polyB-&Zodz-polyA type (SBS) have been traditionally made via either (1) a sequential method wherein the three blocks are formed sequentially using a monoanionic organolithium compound as the initiator or (2) a linking method wherein diblock precursors are linked by the linking agent, leading to the formation of the final polymer. However, neither of these two methods are suitable for synthesizing triblock copolymers with active functional groups at both chain ends, such as hydroxylterminated SBS and carboxyl-terminated SBS.…”