Synthesis of Silicone‐Methacrylate Copolymers by ATRP Using a Nickel‐Based Supported Catalyst

Abstract

Summary: A nickel (II) bromide catalyst immobilized onto crosslinked diphenylphosphinopolystyrene (PS‐PPh3/NiBr2) was used for the synthesis of silicone‐methacrylate copolymers by atom transfer radical polymerization (ATRP) of various methacrylate monomers using ω‐bromide silicone chains as macroinitiator. The polymerization proved to be very well‐controlled when a sufficient amount of soluble ligand, i.e., triphenylphosphine (PPh3), was added to the polymerization medium. Under these conditions, this technique efficiently led to the production of different copolymers with controlled compositions and molecular weights as well as narrow polydispersity indices ($\overline M _{\rm w} /\overline M _{\rm n}$ < 1.5). The recovered copolymers proved to be almost free of catalyst residues. Indeed, inductively coupled plasma (ICP) analysis revealed a metal content lower than 100 ppm, representing only a few percent of the initial metal content in the polymerization medium.Synthesis of PDMS block copolymer in toluene catalyzed by PS‐PPh3/NiBr2 in the presence of soluble PPh3 at 90 °C.imageSynthesis of PDMS block copolymer in toluene catalyzed by PS‐PPh3/NiBr2 in the presence of soluble PPh3 at 90 °C.

Synthesis, self-assembly, and thermosensitivity of amphiphilic POEGMA-PDMS-POEGMA triblock copolymers

“…As is well known, the hydrodynamic volumes of linear and comb like (graft) polymers with similar molecular weights can diverge substantially, and the flexibility of the molecular structure also impacts on the hydrodynamic volumes . Therefore, the molecular weight parameters recorded by GPC in this study, which were relative to PS standards, were only used to indicate the synthesis of the copolymers and measure the polydispersities . So, M n,NMR was chosen to decide the number average molecular weights of the copolymers.…”

Biocompatible Stimuli-Responsive W/O/W Multiple Emulsions Prepared by One-Step Mixing with a Single Diblock Copolymer Emulsifier

“…The PDMS-macroinitiator is obtained by simple condensation reaction of well-defined hydroxyl terminated PDMS with BrMPBr 28,29 , which has been used in a subsequent step for the polymerization of DMAEMA by ATRP (Figure 1 isopropyl myristate as emulsifiers. for which the scale bar is 100 µm.…”

Synthesis, characterization and properties of amphiphilic block copolymers of 2-hydroxyethyl methacrylate and polydimethylsiloxane prepared by atom transfer radical polymerization

“…The presence of micelles leads to different flow and structural characteristics than those of a homopolymer of any single block. In previous studies, several different amphiphilic block copolymers were synthesized, such as PEO-b-PS-b-PAA, 19 (PAA-b-PS) 6 (star PAAb-PS), 20 P(DMS-b-MMA-b-DMAEMA), 21 P(Sty-DMS-b-MMA) 22 and PEA-b-PEO-b-PEA. 23 Previously, pHEMA-b-PDMS-b-pHEMA triblock copolymers with varying block molecular weights had not been polymerized by ATRP.…”