a Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
Polym. Chem. 2014, 5, 1992-1998
This work presents a facile method for removing thiocarbonylthio end groups from RAFT-made polystyrene (PS) under the catalysis of Cu(0) or Fe(0). In Cu(0)-catalyzed cases, 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO) was able to promote the removal of thiocarbonylthio end groups with the production of a distinct bimodal molecular weight distribution (MWD). The chain end structure of the resultant polymer was carefully identified by the matrix-assisted laser desorption ionization time-of-flight mass spectrum. However, in the Fe(0)-catalyzed system, TEMPO and ligands were not needed for the removal of thiocarbonylthio end groups with a more efficient removal. This work provides an alternative approach for removing thiocarbonylthio end groups of RAFT-made PS as well as producing thiocarbonylthio-free PS with controllable bimodal MWD.
链接：
//pubs.rsc.org/en/content/articlelanding/2014/py/c3py01327h#!divAbstract
