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High Performance Polymers
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New AB Polyetherimides Obtained by Direct Polycyclocondensation of Aminophenoxy Phthalic Acids

Pavel V. Buzin

Marina Yu. Yablokova

Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Science, 70, Profroyuiznaya ul., Moscow, 117393, Russia

Alexander A. Kuznetsov

Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Science, 70, Profroyuiznaya ul., Moscow, 117393, Russia kuznets{at}ispm.ru

Alexey V. Smirnov

Igor G. Abramov

Yaroslavl State Technical University, 88, Moscovskii pr, Yaroslavl, 150023, Russia

The one-pot, high temperature, catalytic synthesis of polyetherimides (PEIs) in molten benzoic acid was investigated. The synthesis was conducted using the AB monomers, 4-aminophenoxy phthalic acid (IIa) and 3-aminophenoxy phthalic acid (IIb). Both Homo and co-PEIs with different ratios of substituted AB IIa and IIb were prepared and characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry and wide angle X-ray diffraction. The solubility of the polymers in a variety of solvents was also investigated. Homo-poly-lib is an amorphous thermoplastic that is soluble in CHC13 DMS8 and amide-type solvents. Homo-poly-IIa has a locally ordered structure and is insoluble. Properties of the IIa/IIb copolymers depend strongly on their composition. When the IIa/Hlb ratio is 30: 70 or less, co-PEIs behave as thermoplastic substances soluble in chloroform. At an IIa/lIb ratio in the starting mixture of 40: 60 or higher, the properties of co-PEIs are similar to that of poly-IIa.

Key Words: Polyetherimides • copolyimides • polycyclocondensation • high temperature one-stage catalytic • aminophenoxy phthalic acids as monomers • AB- • benzoic acid • molten as medium • DSC • WAXD

High Performance Polymers, Vol. 16, No. 4, 505-514 (2004)
DOI: 10.1177/0954008304039991
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