Grafting polymers onto C60 via an atom transfer reaction
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Mechanistic investigation and selectivity of the grafting onto C <inf>60</inf> of macroradicals prepared by cobalt-mediated radical polymerization
2012, PolymerCitation Excerpt :The multi-angle laser light scattering (MALLS) detection available on our SEC operating in DMF/LiBr revealed useless since the nanohybrids showed the signs of a non-ideal elution that resulted in meaningless molecular weight values. As a rule, the addition onto C60 of macroradicals prepared by ATRP or NMP yields C60 substituted by 2 or 4 polymer chains, depending on the stoichiometry [19–21]. The trend of forming adducts with even numbers of chains also emerges in Fig. 1b and will be helpful to assign all peaks in the SEC chromatograms.
Synthesis of Buckminsterfullerene C<inf>60</inf> functionalised core cross-linked star polymers
2008, PolymerCitation Excerpt :At all C60/PMMA mole ratios employed low polydispersity C60 CCS polymers were prepared that possessed ≥12 arms. However, it should be noted that although macromolecules with a large number of arms can be prepared, the average number of arms per C60 molecule decreases from 60 to 3.5 as the C60/PMMA mole ratio increases, thus P1a, P1d and P1e have a ratio of arms to C60 comparable with star polymers synthesised by the addition of living linear polymers (via ATRA or nucleophilic addition) to C60 to form C60 core-type star polymers [6–13]. For all the C60 CCS polymers prepared the calculated loading was less than the theoretical loading and the % incorporation of C60 was found to decrease with increasing C60/PMMA mole ratio (Table 3).
Controlled grafting of polymer chains onto C<inf>60</inf> and thermal stability of the obtained materials
2006, Comptes Rendus ChimieCitation Excerpt :But, this conclusion is questionable, as a more convincing interpretation of the presented SEC data would in fact support the formation of di-adducts. Our own work on the addition of PSBr onto C60 by ATRA [37,38] showed that no mono-adducts are obtained even if the C60 is used in a 10-fold excess and only the grafting of an even number of chains is observed. Pure di-adducts are produced if the ratio PSBr/C60 is kept lower than 2 and we were able to demonstrate for the first time that pure tetra-adducts can also be obtained if the excess of PSBr over C60 is larger than 4.
Investigation of fullerene C<inf>60</inf> effect on properties of polymethylmethacrylate exposed to ionizing radiation
2005, European Polymer Journal