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Synthesis, mechanisms. Kinetics and characterization of polyamic acid and polyetherimides
Author(s) -
GrenierLoustalot MarieFlorence,
Joubert Frédéric,
Grenier Philippe
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910420128
Subject(s) - chemistry , monomer , polymer chemistry , nucleophile , polymerization , amine gas treating , benzene , diamine , ring (chemistry) , polymer , solvent , kinetics , organic chemistry , catalysis , physics , quantum mechanics
We have synthesized a series of model compounds to study the polymerization mechanisms of polyamic acids prepared from a dianhydride and an aromatic diamine. Structural information (FTIR, liquid and solid (CPMAS) 13 C NMR spectroscopy) obtained with model compounds has enabled the precise determination of the endchains (anhydride/amine acid ratios) in the polymers synthesized. In terms of reaction mechanisms, it was snown that the reaction path of dianhydride ring opening is such that the carbon atom bearing the carbonyl group on the benzene ring (meta from the bridge) preferentially undergoes nucleophilic attack and that the anhydride rings on the initial monomer can be considered to be independant. It was also shown that the reaction solvent has a very pronounced effect on the stereoselectivity of the reaction.