Living free-radical block copolymerization using thio-iniferters

Xanthate‐Mediated Controlled/Living Free‐Radical Polymerization under 60Co γ‐Ray Irradiation: Structure Effect of O‐Group

“…The combined organic extracts were washed with water (2 Â 40 mL), dried over anhydrous Na 2 SO 4 and evaporated to afford a crude product, which was purified by column chromatography on silica gel (hexane/ethyl acetate, 3:1) to give a red crystalline solid (72% yield). 1 …”

“…[1] Some prominent techniques have developed, such as living free radical nitroxide-mediated polymerization (NMP), [2][3][4] atom transfer radical polymerization (ATRP) [5][6][7][8] and the reversible addition-fragmentation chain transfer (RAFT) [9,10] process. More recently Bai et al found that controlled/living free radical polymerizations of vinyl monomers can be performed under 60 Co g-ray irradiation in the presence of dibenzyl trithiocarbonate [11][12][13] and dithiobenzoic acid, [14] though the g-ray irradiated polymerization is generally very difficult to control.…”

Use of Fluorinated Organic Compounds in Living Radical Polymerizations

“…Fluorinated alkyl iodides such as CF 3 -(CF 2 ) 5 -I, and to a lower extent CF 3 -(CF 2 ) 5 -(CH 2 ) 2 -I, were reported to be efficient telogens 67 . However, the living character of the polymerization carried out in the presence of alkyl iodides was reeconsidered 15,68,69 . A large variety of branched or linear perfluoroalkyl iodides or α,ω-diiodoperfluoroalkanes 70 have been involved in iodine transfer polymerization (ITP) 71 or in stepwise cotelomerization of fluoroalkenes 72 .…”

“…Tatemoto et al 15,71,108,109,112-114 used peroxides as initiators of polymerization. Improvement is also possible by using diiodo and polyiodo compounds 115,116 .…”

“…The most popular techniques are the iniferter method [3][4][5][6][7] (where iniferter stands for INItiation-transFER-TERmination), nitroxide-mediated radical polymerization (NMP) [8][9][10][11] , atom transfer radical polymerization (ATRP) [12][13][14] , iodine transfer polymerization (ITP) 15 , and reversible addition-fragmentation chain transfer (RAFT) [16][17][18][19][20] , whose specific mechanisms are briefly summarized in Scheme 2 21,22 .…”