of sulpholcrephlhalic acid and its dependence on the copolymer composition, crystallization temperature
and temperature of measurement
The WAXS and SAXS methods were used for the determination of supermolecular structure of copolymers of ethylene torephthalate and potassium salt of sulphoterephthalic acid containing to 10 mole-% of SO3K groups. Studies were carried out both at room temperature and at elevated temperature of 420-523 K. It was found that size of L(100) crystallites and content of crystalline chase decrease with an increase in content of SO3K ions. At higher temperature, regardless of the content of SO3K groups and of the crystallization temperature (420-460 K), the values of long period and thickness of intermediate regions decrease. An interpretation of the obtained results was presented. X-ray studies did not allow a direct differentiation of the effect of two processes responsible for the structure of copolymers under study, namely the effect of crystallization and of aggregation of ionic groups.
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