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5175519 
Journal Article 
Synthesis of hyperbranched aromatic poly(amide-imide): Copolymerization of B ' B(2) monomer with A(2) monomer 
Chang, YT; Shu, CF 
2003 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
36 
3 
661-666 
English 
WOS:000180868000024 
A hyperbranched aromatic poly(amide-imide) was prepared by the copolymerization of 4-(3,5-dicarboxyphenoxy)phthalic anhydride, a B'B2 type monomer, and 1,4-phenylenediamine, an A(2) type monomer. The rapid reaction between the anhydride and amino group led to the formation of the dominant imide intermediate which can be regarded as a new AB(2) type of monomer. The intermediate, without isolation, was subjected to further polymerization in the presence of TPP/pyridine, as condensing agents, to give the hyperbranched poly(amide-imide), containing carboxylic acid chain ends. In comparison, the AB(2) monomer was prepared separately, and the conventional self-polymerization of this monomer was also studied. The structures of the obtained polymers were characterized by FTIR and (1)H NMR spectroscopy. The spectral data showed that these two polymers, prepared from two different synthetic approaches, have nearly identical structures. The degree of branching of the hyperbranched poly(amideimide)s was estimated to be 60-61%. The terminal carboxylic acid groups were modified by reaction with a variety of aromatic amines to give the corresponding amide derivatives. The nature of the chain ends was shown to have a significant effect on the solubility and T, of the hyperbranched poly(amideimide)s. 
Polymer Science; bb'(2) type monomers, dendritic macromolecules, direct polycondensation,; molecular architecture, polyamide copolymers, divinyl sulfone, polymers,; acid, polyaddition, polyimides