A new immobilized catalytic system, c
ross-linked poly(ac
rylic acid) (PAA)
resin immobilized cobalt(II)/coppe
r(II) bimetallic catalyst, was successfully employed fo
r atom t
ransfe
r radical polyme
rization (ATRP) of methyl methac
rylate (MMA). Well-defined poly(methyl methac
rylate) (PMMA) with low polydispe
rsity (PDI = 1.27) was synthesized using PAA/Co(II)/Cu(II) catalyst without any additional ligand o
r soluble deactivato
r. As the immobilized catalyst could be effectively sepa
rated f
rom the polyme
r solution by simple cent
rifugation afte
r polyme
rization, colo
rless PMMA (Co
residue < 1 ppm, Cu
residue
rc="http://www.sciencedi
rect.com/scidi
rimg/entities/223c.gif" alt="not, ve
rt, simila
r" bo
rde
r=0>4 ppm) was achieved. Both main catalytic activity and good cont
rollability ove
r polyme
rization we
re
retained by the
recycled catalyst afte
r reused seve
ral times. The catalyst was cha
racte
rized by SEM, EDX, TGA and ESR techniques. The polyme
rization
reaction mechanism was p
resented.