Two-dimensional (2D) quasi-living crystallization-driven self-assembly of polyethylene-<i>b</i>-hyperbranched polyglycidol diblock copolymers in solution.
basic_science · Level V
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- Also identified by DOI 10.1039/d4sm00845f.
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Abstract
This paper presents a systematic investigation of the crystalline nucleation, micellization, two-dimensional (2D) growth of polyethylene-<i>b</i>-hyperbranched polyglycidol (PE-<i>b-hb</i>PG) copolymers in solutions during cooling and isothermal crystallization. As a result, lozenge-shaped monolayer or multilayer lamellar crystals were prepared by optimizing the "self-nucleation" conditions. The effect of crystallization temperatures (<i>T</i><sub>c</sub>), critical micelle temperature (CMT), selective solvents, and the topology of block copolymers (BCPs) on the growth of 2D lozenge-shaped crystals is extensively explored using TEM, AFM and <i>in situ</i> DLS techniques. The results demonstrate that the formation of a perfect lozenge-shaped monolayer crystal is contingent upon the relationship between CMT and <i>T</i><sub>c</sub> of the BCPs (CMT < <i>T</i><sub>c</sub>), as well as the isothermal crystallization temperature <i>T</i><sub>iso</sub> (CMT < <i>T</i><sub>iso</sub> < <i>T</i><sub>c</sub>). This significant finding provides a feasibility programme for the preparation of 2D lamellar crystals using the "self-nucleation" approach from an alternative viewpoint of the corona topology.