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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of different...

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

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ABC triblock copolymer vesicles with mesh-like morphology.

Wei Zhao¹, Dian Chen, Yunxia Hu

¹Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States.

|December 7, 2010

Summary

Researchers studied polymer vesicles formed by poly(isoprene-b-styrene-b-2-vinyl pyridine) triblock copolymers in anodic aluminum oxide membranes. These nanoscopic vesicles exhibit unique mesh-like morphologies driven by confinement and copolymer composition.

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

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Obtention of Giant Unilamellar Hybrid Vesicles by Electroformation and Measurement of their Mechanical Properties by Micropipette Aspiration

Obtention of Giant Unilamellar Hybrid Vesicles by Electroformation and Measurement of their Mechanical Properties by Micropipette Aspiration

Published on: January 19, 2020

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Triblock copolymers self-assemble into complex nanostructures.
Anodic aluminum oxide (AAO) membranes provide nanoscale confinement for material templating.
Controlling polymer morphology within confined environments is crucial for advanced applications.

Purpose of the Study:

To investigate the formation and morphology of polymer vesicles from poly(isoprene-b-styrene-b-2-vinyl pyridine) (PI-b-PS-b-P2VP) triblock copolymers within AAO membranes.
To understand the influence of copolymer composition and nanoscale confinement on vesicle structure.

Main Methods:

Synthesis of PI-b-PS-b-P2VP triblock copolymers.
Confining copolymers within the nanopores of AAO membranes.
Characterization of vesicle morphology using transmission electron microscopy (TEM) and scanning electron microscopy (SEM).

Main Results:

Formation of well-defined, nanoscopic polymer vesicles.
Observation of complex microphase-separated hydrophobic membranes (PS and PI blocks) and P2VP block coronas.
Discovery of a tunable, mesh-like morphology dependent on copolymer composition.
Demonstration that nanoscale confinement and copolymer composition dictate vesicle generation.

Conclusions:

PI-b-PS-b-P2VP triblock copolymers form unique nanoscopic vesicles within AAO membranes.
The observed complex morphologies are a result of interplay between nanoscale confinement, copolymer composition, and molecular interactions.
This study provides insights into controlling polymer self-assembly in confined nanoporous systems.