Atom Transfer Radical Polymerization Using Multidentate Amine Ligands Supported on Soluble Hyperbranched Polyglycidol

Abstract

Summary: Controlled polymerization of styrene in toluene was achieved by atom transfer radical polymerization (ATRP) using hyperbranched polyglycidol‐supported multidentate amine ligands/CuIBr catalyst systems. These catalyst systems with nanoscopic dimensions were more active than the corresponding low‐molecular‐weight ligands. The controlled/living nature of the polymerization is supported by linear first order plots (ln[M]o/[M] versus time) and a linear increase of $\overline M _{\rm n}$ versus conversion as well as low polydispersity. Similar controlled polymerization of methyl methacrylate was possible in acetonitrile. Up to 97% of total copper used for polymerization could be removed from the polymer by simple precipitation in methanol and filtration.Molecular weight characteristics for styrene polymerization using PG‐triamine as a ligand.magnified imageMolecular weight characteristics for styrene polymerization using PG‐triamine as a ligand.

Heck and oxidative boron Heck reactions employing Pd(II) supported amphiphilized polyethyleneimine‐functionalized MCM‐41 (MCM‐41@aPEI‐Pd) as an efficient and recyclable nanocatalyst

“…Different methods were taken into account to stabilize nanometals on the support using various types of functional molecules such as polymers, surfactants, and different types of ligands as capping agents. Both dendrimers and hyperbranched polymers covalently or noncovalently functionalized with catalytically active transition metal complexes are one of promising scaffolds with respect to catalyst recovery . In many aspects, dendrimers can be replaced by hyperbranched polymers due to their similar properties, such as low viscosity, high functionalities and spheroid‐like shape.…”

“…Both dendrimers and hyperbranched polymers covalently or noncovalently functionalized with catalytically active transition metal complexes are one of promising scaffolds with respect to catalyst recovery. [21][22][23] In many aspects, dendrimers can be replaced by hyperbranched polymers due to their similar properties, [24] such as low viscosity, high functionalities and spheroid-like shape. The silica-supported palladium nanoparticles-mediated organic transformations have been developed remarkably.…”

Hyperbranched poly(amine-ester) polyol: Synthesis, characterization, thermal stability, solubility and surface activity

“…Selier M et al reported that Boltorn type HPPs can be used as distillation extractant and possess better function than linear polyhydric alcohol, such as 1,6-hexanediol [6,7,8]. Siriba et al and Kumar et al reported respectively that HPPs can be used as catalyst delivery via formation of covalent bonds of the terminal hydroxyls and catalyst [9,10]. On the other hand, HPPs can be easily modified through the conversion of end groups; Kishore K. Jena et al reported that a series of organic-inorganic hybrid coatings from hyperbranched polyurethanes were prepared using HPEP and 3-aminopropyltriethoxysilane [11].…”

Comparison of Hyperbranched and Linear Polyglycidol Unimolecular Reverse Micelles as Nanoreactors and Nanocapsules

“…Molecular weights, intrinsic viscosity [Z], hydrodynamic radii (R h ), and radii of gyration (R g ), were determined by gel permeation chromatography (GPC) with a triple detector; the details have been described earlier. [7] The dn/dc value for polyglycidol was determined to be 0.12 cm 3 Á g À1 . Hydrodynamic radii (R h ) of esterified polymers were measured at room temperature (22 8C) using a DAWN EOS multi-angle laser light scattering (MALLS) instrument from Wyatt Technology Corp. equipped with a Wyatt Quasi Elastic Light Scattering (QELS) correlator.…”