Poly(p-phenylene), PPP, becomes soluble by nitration and two types of nitrated PPPs give an Mn of 5800 ± 400 in the GPC analysis. Poly(pyridine-2,5-diyl), PPy, has been found to be soluble in hexafluoro-i-propanol, and its GPC analysis gives an Mn and Mw of 6800 and 23000, respectively.
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Yamamoto et al. (1999) studied this question.
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