Abstract
It is shown for the first time that polyarylane phthalides form coloured solutions in concentrated 94% suphuric acid ( ε≈1 × 10 4 l./mole·cm), which are characterized by relatively high stability of optical density. It was found that the colour of solutions depends on the chemical structure of the dissolved polymer. A new highly sensitive method was developed (minimum concentration 0·02 μ/ml) for the quantitative determination of polyarylene phthalides, which involves the photometric evaluation of their coloured solutions in sulphuric acid. The merits of the method proposed and the possibilities of its application for gel-sol analysis of polyarylene phthalides, for determining the content of polymer in the filtrates formed during refining by reprecipitation and the thickness of polyarylene phthalide coatings are indicated.
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