Polycondensation of phenyl 4-(octylamino)benzoate (1) in the presence of diphenyl terephthalate (2) as a difunctional initiator proceeded in a bidirectional propagation from 2. This polycondensation was applied to the synthesis of poly(ethylene glycol) (PEG)–aromatic polyamide–PEG triblock copolymer (4) as a new, well-defined coil-rod-coil triblock copolymer.
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Sugi et al. (2003) studied this question.