mz9b00747_si_001.pdf (2.21 MB)
Synthesis and Solution Self-Assembly Properties of Cyclic Rod–Coil Diblock Copolymers
journal contribution
posted on 2019-11-18, 16:40 authored by Lingfeng Gao, Zhichao Ji, Yiming Zhao, Yuanli Cai, Xiaohong Li, Yingfeng TuTypical cyclic diblock polymers are synthesized from
their linear precursors via the ring-closure strategy in dilute conditions.
Here we demonstrate a pseudo-high-dilution condition strategy for
the efficient synthesis of cyclic rod–coil diblock copolymer
from its linear precursor in selective solvents. The critical association
concentration (CAC) of linear precursor is used for the control of
unimer concentration during cyclization, while high copolymer synthetic
concentrations are achieved via the dynamic equilibrium between unimers
and micelles. The effects of CAC and micelle concentration on cyclization
yield are studied and pure cyclic rod–coil diblock copolymer
was obtained after azide resin treatment. Property investigations
show the cyclic rod–coil copolymer has a larger second virial
coefficient than its linear counterpart and self-assembles in selective
solvents to form larger but looser spherical micelles due to its constraint
topological structure.
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cyclizationcopolymerCACazide resin treatmentconstraint topological structureSolution Self-Assembly Propertiesring-closure strategyvirial coefficientassociation concentrationsolventmicelle concentrationunimer concentrationcyclic diblock polymersprecursorproperty investigations showpseudo-high-dilution condition strategy
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