Preparation of fluoroalkyl end-capped oligomers/magnetite nanocomposites possessing a good dispersibility and stability

Selective preparation of novel fluoroalkyl end-capped co-oligomeric nanocomposite-encapsulated magnetites and magnetite-adsorbing co-oligomeric nanoparticles

“…In fact, we have already reported that fluoroalkyl end-capped oligomers containing not only carboxyl groups but also other functional groups such as phosphonic acid, sulfonic acid and sulfobetaine-type groups can interact effectively with the residual hydroxyl groups on the magnetite surface to form new fluorinated magnetic nanocomposites with good dispersibility in a variety of solvents, including water. [33][34][35][36] Such good dispersibility of tailored magnetic fluorinated polymer colloids is due to the presence of fluoroalkyl end-capped oligomers because fluoroalkyl end-capped oligomers can exhibit various unique properties such as high solubility, surface active properties, biological activities and nanometer scale self-assembled molecular aggregates, which cannot be achieved by the corresponding nonfluorinated, randomly fluoroalkylated and AB block-type fluoroalkylated polymers. [37][38][39][40] With regard to these fluoroalkyl end-capped oligomers, we have very recently found that crosslinked fluoroalkyl end-capped co-oligomers containing both oxime-blocked isocyanato and hydroxy adamantyl segments can form new crosslinked fluoroalkyl end-capped co-oligomeric nanoparticles containing adamantane segments through the deprotecting reaction of oxime-blocked isocyanato segments in co-oligomers.…”