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Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

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Prismatic Block Copolymer Hexosomes.

André H Gröschel^1,2, Tina Gröschel³, Suna Azhdari¹

¹Institute for Physical Chemistry and Center for Soft Nanoscience (SoN), University of Münster, Corrensstraße 28-30, 48149 Münster, Germany.

|August 11, 2023

Summary

This summary is machine-generated.

Researchers created flat, prismatic block copolymer hexosomes with connected channels using a "supersoft" confinement method. This breakthrough allows for novel particle shapes by tuning polymer-solvent interactions.

Keywords:

block copolymers electron tomography hexosomes self-assembly supersoft confinement

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Cubosomes and hexosomes are ordered porous structures formed by lipids and block copolymers (BCPs).
Lipid hexosomes are typically prismatic, but BCP hexosomes have been observed only as closed microspheres.
Achieving connected internal channels in BCP hexosomes is a key challenge.

Purpose of the Study:

To describe the formation of flat, prismatic BCP hexosomes with connected channels.
To investigate the role of polymer-solvent interactions and confinement conditions in BCP hexosome morphology.
To explore the potential for creating unusual BCP particle shapes.

Main Methods:

Assembly of polystyrene-block-poly(4-vinylpyridine)-block-poly(tert-butyl methacrylate) (SVT) in low-χ solvents.
Solvent exchange process inducing liquid-liquid phase separation and confined assembly.
Utilizing a
supersoft
confinement
strategy due to low interfacial tension.

Main Results:

Formation of flat, prismatic BCP hexosomes with a hexagonal lattice of connected channels.
Demonstration that low interfacial tension in "supersoft" confinement stabilizes the prismatic shape.
Observation of shape deformation into spinning-top structures with increased interfacial tension.

Conclusions:

Low-χ solvents enable the formation of novel, faceted BCP hexosomes with connected internal structures.
The "supersoft" confinement approach offers a pathway to control BCP morphology.
Tuning polymer-solvent interactions provides a versatile method for designing unique BCP particle shapes.