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Reactions of polystyrene radicals in a monomer-free atom transfer radical polymerization system
| Content Provider | Scilit |
|---|---|
| Author | Yoshikawa, Chiaki Goto, Atsushi Fukuda, Takeshi |
| Copyright Year | 2002 |
| Abstract | Polystyrene radicals (PS•) were produced in high concentration using ω-bromopolystyrene (PS-Br) and α,ω-dibromopolystyrene (Br-PS-Br) in conjunction with Cu(I)Br following the atom transfer technique. A proper choice of the activator system led the PS-Br adduct to a maximum extent of coupling (by recombination), qmax = 0.91, as estimated by gel permeation chromatography. On the other hand, the fraction of chains terminated by disproportionation was estimated to be 0.07 ± 0.04 by 1H NMR. When the radical concentration [PS•] was not high enough, the chain transfer reaction competed with termination, and qmax remained low. For the bifunctional adduct Br-PS-Br, the coupling reaction produced ‘polymers’ of a variety of chain lengths, whose distribution obeyed the theory of random coupling, when q was lower than about 0.5. The high extent of coupling (qmax ≈ 0.9) achievable in short time (< 10 min) suggests practical applicability of this reaction. |
| Related Links | http://www.degruyter.com/dg/viewarticle.fullcontentlink:pdfeventlink/$002fj$002fepoly.2002.2.issue-1$002fepoly.2002.2.1.172$002fepoly.2002.2.1.172.pdf?t:ac=j$002fepoly.2002.2.issue-1$002fepoly.2002.2.1.172$002fepoly.2002.2.1.172.xml |
| Ending Page | 183 |
| Page Count | 12 |
| Starting Page | 172 |
| ISSN | 21974586 |
| e-ISSN | 16187229 |
| DOI | 10.1515/epoly.2002.2.1.172 |
| Journal | e-Polymers |
| Issue Number | 1 |
| Volume Number | 2 |
| Language | English |
| Publisher | Walter de Gruyter GmbH |
| Publisher Date | 2002-12-01 |
| Access Restriction | Open |
| Subject Keyword | E-polymers Polymer Science Polymerization Atom Termination Polystyrene Radicals Extent Qmax Journal: e-Polymers, Vol- 2 |
| Content Type | Text |
| Resource Type | Article |
