| Title | ESR spectroscopy to determine the molecular mobility of poly(ethylene oxide) grafts in amphiphilic graft copolymers |
| Publication Type | Journal Article |
| 1998 |
| Authors | Ji, J, Feng, L, Qiu, Y, Yu, X |
| Journal | Macromolecular Rapid CommunicationsMacromol. Rapid Commun. |
| Volume | 19 |
| Issue | 9 |
| Pagination | 473 - 477 |
| Date Published | 1998/// |
| 10221336 (ISSN) |
| The ethylene oxide (EO) mobility in polystyrene-graft-[poly(ethylene oxide)] (PS-g-PEO) and polystyrene-graft-[stearyl poly(ethylene oxide)] (PS-g-SPEO) copolymers was evaluated by spin probe techniques. The ESR spectra indicate that 4-hydroxyl-TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidine-N-oxyl) is strongly biased to the PEO phase of the PS-g-(S)PEO membranes. The rotational correlation time τ c can also be employed to assess the PEO mobility in PS-g-(S)PEO membranes. Although τ
c of PS-g-(S)PEO usually decreases with increasing surface density of EO, it is of interest that τ
c is rather high when the surface within a depth of at least 5 nm is fully occupied by SPEO (sample PS-g-SPEO-72.6).
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| http://www.scopus.com/inward/record.url?eid=2-s2.0-0032352685&partnerID=40&md5=2d915a1de24f503ed01fc4c5ee85e639 |
