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Fabrication and Interfacial Properties of Polymer Brush Gradients by Surface-Initiated Cu(0)-Mediated Controlled Radical Polymerization
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dehghani, Ella S. Du, Yunhao Zhang, Tao Ramakrishna, Shivaprakash N. Spencer, Nicholas D. Jordan, Rainer Benetti, Edmondo M. |
| Copyright Year | 2017 |
| Abstract | Surface-initiated Cu(0)-mediated controlled radical polymerization (Si-CuCRP) can be successfully applied to fabricate poly[(oligoethylene glycol)methyl ether methacrylate] (POEGMA) brushes in one pot, presenting a grafting-density gradient across the surface. This is achieved by continuously varying the distance (d) between a copper plate, used as a source of Cu species, and the initiator-functionalized substrate. X-ray photoelectron spectroscopy (XPS) analysis of monolayers of CuI-selective ligands demonstrates that a higher concentration of activator species diffuses to the initiating substrate in areas closer to the copper plate, a progressive decrease in activator concentration being observed upon increasing the distance between the two surfaces. As confirmed by the SI-CuCRP kinetics measured at different positions along the gradient, radical-termination reactions between propagating chains limit the grafting density of POEGMA grafts where the diffusion of activators is favored (i.e., at d → 0). This... |
| Starting Page | 2436 |
| Ending Page | 2446 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/acs.macromol.7b00088 |
| Alternate Webpage(s) | https://tu-dresden.de/mn/chemie/mc/mc1/ressourcen/dateien/publikationen/download/2017/Dehghani17.pdf?lang=en |
| Alternate Webpage(s) | https://doi.org/10.1021/acs.macromol.7b00088 |
| Volume Number | 50 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
