Copper-mediated living radical polymerization (SET-LRP) of lipophilic monomers from multi-functional initiators: reducing star–star coupling at high molecular weights and high monomer conversions

2014 ◽  
Vol 5 (3) ◽  
pp. 892-898 ◽  
Author(s):  
Christopher Waldron ◽  
Athina Anastasaki ◽  
Ronan McHale ◽  
Paul Wilson ◽  
Zaidong Li ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Living Radical Polymerization ◽  
Molecular Weights ◽  
Functional Initiators

scholarly journals Aqueous Photo-Living Radical Polymerization of Sodium Methacrylate Using a Water-Soluble Nitroxide Mediator

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Eri Yoshida
Keyword(s):  
Molecular Weight ◽  
Radical Polymerization ◽  
Linear Correlation ◽  
Linear Increase ◽  
Living Radical Polymerization ◽  
Water Soluble ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
Sodium Methacrylate

The aqueous photo-living radical polymerization of sodium methacrylate (NaMA) was attained using 2,2′-azobis2-methyl-N-[1,1-bis(hydroxymethyl)-2-hydroxyethyl]-propionamide (V-80) as the initiator and 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (HTEMPO) as the mediator in the presence of (4-fluorophenyl)diphenylsulfonium triflate (FS). The polymerization was carried out in water at room temperature by irradiation using a high-pressure mercury lamp. Whereas the polymerization by V-80 and/or FS in the absence of HTEMPO produced polymers with very high molecular weights and broad molecular weight distributions, the HTEMPO-mediated polymerization provided still lower-molecular-weight distributions using both V-80 and FS. The first-order time-conversion plots had an induction period up to 2.5 h; however, they thereafter showed a linear increase. The conversion-molecular weight plots also exhibited a linear correlation. A linear correlation was also obtained for the plots of the molecular weights versus the reciprocal of the initiator concentration. Based on these three correlations, it was found that the HTEMPO-mediated photopolymerization proceeded by a living mechanism.

Synthesis of PMMA by Single-Electron Transfer Radical Polymerization Using Benzyl Chloride as Initiator

2013 ◽  
Vol 645 ◽  
pp. 85-88
Author(s):  
Chang Qing Fu ◽  
Xiao Bo Wei ◽  
Liang Shen
Keyword(s):  
Electron Transfer ◽  
Radical Polymerization ◽  
Benzyl Chloride ◽  
Living Radical Polymerization ◽  
Single Electron ◽  
Order Kinetic ◽  
Single Electron Transfer ◽  
Narrow Molecular Weight Distribution ◽  
First Order ◽  
Molecular Weights

Single electron transfer living radical polymerization (SET-LRP) has developed to be a robust tool for the construction of well-designed polymers. This paper reports the influence of one cheaper initiator on the SET-LRP process. The SET-LRP of methyl methacrylate (MMA) initiated with benzyl chloride and catalyzed by Cu(0)/PMDETA at 25°C in methanol is described. The polymerization kinetics was recorded. The reactions followed first-order kinetic in monomer consumption and the molecular weights increased linearly with conversion while retaining narrow molecular weight distribution. Therefore, it is plausible that SET-LRP of MMA initiated with benzyl chloride process to yield well defined macromolecules.

Precise synthesis of poly(N-acryloyl amino acid) through photoinduced living polymerization

2018 ◽  
Vol 9 (20) ◽  
pp. 2733-2745 ◽  
Author(s):  
Guofeng Li ◽  
Wenli Feng ◽  
Nathaniel Corrigan ◽  
Cyrille Boyer ◽  
Xing Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
Radical Polymerization ◽  
Living Polymerization ◽  
Living Radical Polymerization ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions

A library of N-acryloylamino acid polymers with controlled molecular weights and narrow molecular weight distributions (Mw/Mn < 1.20) was created by a universal and versatile photoinduced living radical polymerization technique.

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