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Abstract
The methods of polarizing and electron microscopy were used to investigate structure formation during phase transitions in concentrated solutions of poly- p-phenyleneterephthalamide in sulphuric acid. The data obtained are explained in terms of various types of phase equilibrium. It is shown that under certain conditions a major role in structure formation is played by crystallization in the form of crystal-solvates of the type of poly- p-phenyleneterephthalamide · pH 2SO 4. All the observed structuro-morphological patterns may be described satisfactorily by using the phase diagram previously proposed for poly- p-benzamide.
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