Self-assembly of lightly charged block copolymers into nonclassical morphologies
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Charged block copolymers are of great interest due to their unique self-assembly and physicochemical properties. Understanding of the phase behavior of charged block copolymers, however, is still at a primitive stage. This talk will present the discovery of an intriguing superlattice morphology from compositionally symmetric charged block copolymers achieved by systematic variation of the molecular structure in general, and the charge content in particular. The lightly charged block copolymer self-assembles into a superlattice lamellar morphology, a previously unknown class of diblock nanostructures, but strikingly similar to oxygen-deficient perovskite derivatives, when the fraction of charged groups in the POEGMA block is about 5–25%. The charge fraction and the tethering of the ionic groups both play critical roles in driving the superlattice formation. This study highlights the accessibility of superlattice morphologies by introducing charges in a controlled manner.