Health & Environmental Research Online (HERO)


Print Feedback Export to File
4717433 
Journal Article 
Living Radical Polymerization with Alkali and Alkaline Earth Metal Iodides as Catalysts 
Sarkar, Jit; Xiao, L; Goto, A 
2016 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
49 
14 
5033-5042 
English 
WOS:000380576900004 
The generation of an alkyl radical (R-center dot) from an alkyl iodide (R-I) with NaI playing a catalytic role was experimentally demonstrated. This catalytic reaction was exploited as an activation process for living radical polymerization. Alkali metal iodides, NaI, KI, and CsI, and alkaline earth metal iodides, MgI2 and CaI2, were systematically studied as catalysts. 18-crown-6-Ether and a polyether, that is, diethylene glycol dimethyl ether (diglyme), were utilized to solvate these catalysts in hydrophobic monomers. Among the five catalysts, NaI exhibited a particularly high reactivity. The polymer molecular weight and its distribution (M-w/M-n 1.2-1.4) were well controlled with high conversions (e.g., 80-90%) in reasonably short periods of time (3-6 h) at mild temperatures (60-70 degrees C) in the polymerizations of methyl methacrylate. NaI is also amenable to styrene, acrylonitrile, and functional methacrylates. In addition to homopolymers, NaI also afforded well-defined block copolymers, chain-end functional polymers, and a star polymer. The high monomer versatility and accessibility to a wide range of polymer architectural designs are desirable features of this polymerization system. 
article; alkaline earth metals; catalysts; catalytic activity; composite polymers; diethylene glycol; hydrophobicity; iodides; molecular weight; organoiodine compounds; polymerization; styrene; temperature 
OPPT REs
• OPPT_1,4-Dioxane_D. Exposure
     Total – title/abstract screening
          Supplemental Search
               Consumer Use