Abstract
The thermal degradation of macromolecules of fibre-forming polyamides and heterocyclic polymers in concentrated H 2SO 4 is a general and irreversible process that limits the possibility of raising the temperature and concentration of the acid in order to improve the solvent's dissolving capacity without breaking down the polymer. The features of the polymers' chemical structure that lead to a lowering of their thermal stability in sulphuric acid solutions have been analysed. With polyamidebenzimidazole as an example, an illustration is given of the use of the thermal degradation of polyamides in H 2SO 4 as a method of reducing the macromolecules' length in a controlled fashion (for analytical purposes) without disrupting the elements of the chemical structure that are responsible for the equilibrium rigidity of the macromolecules in solution.
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