Investigations on the Combination of Cationic Ring Opening Polymerization and Single Electron Transfer Living Radical Polymerization to Synthesize 2-Ethyl-2-Oxazoline Block Copolymers

2012 ◽  
Vol 65 (8) ◽  
pp. 1132 ◽  
Author(s):  
Robert A. Young ◽  
Edward L. Malins ◽  
C. Remzi Becer
Keyword(s):  
Electron Transfer ◽  
Radical Polymerization ◽  
Ring Opening ◽  
Catalyst Concentration ◽  
Ring Opening Polymerization ◽  
Living Radical Polymerization ◽  
Single Electron ◽  
Single Electron Transfer ◽  
Cationic Ring Opening Polymerization ◽  
Glycol Methyl Ether

Cationic ring opening polymerization of 2-ethyl-2-oxazoline (EtOx) has been performed using α–bromoisobutyryl bromide (tertiary) and 2-bromopropionyl bromide (secondary) as initiators in acetonitrile. The reaction kinetics have been followed and selected P(EtOx) polymers have been used as macroinitiators for the single electron transfer living radical polymerization (SET-LRP) of methyl acrylate (MA), ethylene glycol methyl ether acrylate and 2-(dimethylamino)ethyl methacrylate. Moreover, the effect of solvent and catalyst concentration have been investigated on the SET-LRP of P(EtOx) initiated MA.

scholarly journals Copper (0) Mediated Single Electron Transfer-Living Radical Polymerization of Methyl Methacrylate: Functionalized Graphene as a Convenient Tool for Radical Initiator

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 874 ◽  
Author(s):  
Adhigan Murali ◽  
Srinivasan Sampath ◽  
Boopathi Appukutti Achuthan ◽  
Mohan Sakar ◽  
Suryanarayanan Chandrasekaran ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electron Transfer ◽  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Living Radical Polymerization ◽  
Single Electron ◽  
Single Electron Transfer ◽  
Functionalized Graphene ◽  
Radical Initiator ◽  
Vis Spectroscopy

Polymer nanocomposites have been synthesized by the covalent addition of bromide-functionalized graphene (Graphene-Br) through the single electron transfer-living radical polymerization technique (SET-LRP). Graphite functionalized with bromide for the first time via an efficient route using mild reagents has been designed to develop a graphene based radical initiator. The efficiency of sacrificial initiator (ethyl α-bromoisobutyrate) has also been compared with a graphene based initiator towards monitoring their Cu(0) mediated controlled molecular weight and morphological structures through mass spectroscopy (MOLDI-TOF) and field emission scanning electron microscopy (FE-SEM) analysis, respectively. The enhancement in thermal stability is observed for graphene-grafted-poly(methyl methacrylate) (G-g-PMMA) at 392 °C, which may be due to the influence ofthe covalent addition of graphene, whereas the sacrificial initiator used to synthesize G-graft-PMMA (S) has low thermal stability as analyzed by TGA. A significant difference is noticed on their glass transition and melting temperatures by DSC. The controlled formation and structural features of the polymer-functionalized-graphene is characterized by Raman, FT-IR, UV-Vis spectroscopy, NMR, and zeta potential measurements. The wettability measurements of the novel G-graft-PMMA on leather surface were found to be better in hydrophobic nature with a water contact angle of 109 ± 1°.

Sign in / Sign up

Export Citation Format

Share Document