| References |
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Inst. Phys. Conf. Proc. 1999, 475, 541-545; In all cases the thickness of the grafted P3HT means the increase of the film thickness after the polymerization of P3HT; thus, PS(Br) film with the initial thickness of 115 nm becomes 115, 150, 265 nm thick, as deduced by ellipsometry; They detached from Si support during the rinsing step resulting into PS(Br)-graft-P3HT free-standing films; Surface-initiated polymerizations of polyolefins usually do not require thick layers of initiators; living surface-initiated polymerizations show linear dependence of the thickness of the grafted polymer layers on the polymerization time; Trznadel, M., Pron, A., Zagorska, M., Chrzaszcz, R., Pielichowski, J., (1998) Macromolecules, 31, pp. 5051-5058; Kiriy, N., Jähne, E., Adler, H.-J., Schneider, M., Kiriy, A., Gorodyska, G., Minko, S., Stamm, M., (2003) Nano Lett, 3, pp. 707-712; Kiriy, N.; Kiriy, A.; Bocharova, V.; Stamm, M.; Richter, S.; Plötner, M.; Fischer; W, J.; Krebs, F. C.; Senkovska, I.; Adler, H.-J. Chem. Mater. 2004, 16, 4757-4764; DP was determined by 1H NMR; For example, comparing entries 5 and 6 in Table 1 and assuming the polymerization conditions in these two experiments to be identical, we can estimate the contribution of deepest layers of the PS(Br) of the sample 6 into the grafting process. Since the 84 nm thick PS(Br) film grafts 101 nm of P3HT (entry 5), whereas the 115 nm thick sample 6 gives 150 nm thick P3HT film, the contribution of the additional 31 nm thick PS(Br) in the sample 6 (115-84 nm) is responsible for the grafting of additional 39 nm of P3HT; 10.7% of O is found in PS(Br) sample. We cannot rule out possibility of oxidation of PS(Br) during UV cross-linking; however, this unlikely could explain the major part of the oxygen found, since even the sample after P3HT polymerization contains about 9% of O; Lee, W.P., Gundabala, V.R., Akpa, B.S., Johns, M.L., Jeynes, C., Routh, A.F., (2006) Langmuir, 22, pp. 5314-5320; Conductive atomic force microscopy (C-AFM). Veeco Metrology Group, Support No. 300, Rev. A; Wu, C.-G., Chang, S.-S., (2005) J Phys. Chem. B, 109, pp. 825-835; A detailed account of the conductive mode atomic force microscopy studies of the PS(Br)-graft-P3HT films will be published elsewhere |