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w = 125000 g/mol, average of two trials) that were similar to those obtained from a commercial sample (entry 3)
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w = 125000 g/mol, average of two trials) that were similar to those obtained from a commercial sample (entry 3).
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71549127954
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As was the case with our previous polymerizations (ref 24), the chromatograms exhibit bimodality with the high molecular shoulder gaining in prominence (and becoming the main peak for the higest molecular weight examples) with increased gellation during the polymerization. This may be due to a Trommsdorff-like effect in which increased viscoscity affects a molecular-weight limiting side reaction more than the polymerization. While differences in bimodal shape may be caused by differences in workup (for example)
-
As was the case with our previous polymerizations (ref 24), the chromatograms exhibit bimodality with the high molecular shoulder gaining in prominence (and becoming the main peak for the higest molecular weight examples) with increased gellation during the polymerization. This may be due to a Trommsdorff-like effect in which increased viscoscity affects a molecular-weight limiting side reaction more than the polymerization. While differences in bimodal shape may be caused by differences in workup (for example)
-
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37
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We do not believe that to be the case here, since polymers were analyzed after minimal workup, which was the same in all cases
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see: Yamamoto, T.; Abla, M.; Murakami, Y. Bull. Chem. Soc. Jpn. 2002, 75, 1997-2009) we do not believe that to be the case here, since polymers were analyzed after minimal workup, which was the same in all cases.
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n value determined by GPC-LS is likely inflated. It is worth noting that most literature values for polyfluorene have been determined by GPC relative to polystyrene.
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