Abstract
This article reports the synthesis, characterization, and multimorphological aggregation of a series of amphiphilic diblock copolymers bearing strong push−pull azo chromophores. The diblock copolymers (PEGx-b-PCNy), which consist of poly(ethylene glycol) (PEG) and 2-(N-ethyl-N-(4-(4′-cyanophenylazo)phenyl)amino)ethyl methacrylate (PCN) blocks, were synthesized through atom transfer radical polymerization (ATRP) and postpolymerization azo-coupling reaction. PEGx-b-PCNy was prepared to have different hydrophilic/hydrophobic ratios (x = 122, y = 24, 62, 129, 224). Self-assembled aggregates were formed by the gradual addition of water to the solutions of the copolymers in THF. The formation process and morphology of the aggregates were characterized by DLS, SLS, SEM, and TEM. Results show that the block polymers start to form aggregates at the critical water content (CWC), which is related to the initial polymer concentration in THF and PCN block length. The morphology of the aggregates formed in the solution...
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