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Polymer Classification: Crystallinity

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Updated: May 21, 2025

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

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Published on: June 20, 2019

Design of Precise Nanoparticles via Polymer Crystallization.

Jingyuan Gu¹, Zhenyan Chu¹, Bowen Zheng¹

¹State Key Laboratory of Bio-based Fiber Materials, Zhejiang Sci-Tech University, Hangzhou 310018, China.

ACS Macro Letters

|May 5, 2025

Summary

Polymer crystallization drives self-assembly for advanced nanomaterials. Living crystallization-driven self-assembly (CDSA) precisely controls nanoparticle structure and function through seeded growth, enabling complex designs.

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

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Published on: January 7, 2019

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Polymer crystallization is key for self-assembling amphiphiles into anisotropic nanoparticles.
Living crystallization-driven self-assembly (CDSA) is an ambient temperature method for creating low-dispersity nanomaterials like cylinders and platelets.

Purpose of the Study:

To explore the mechanism of living CDSA seeded growth.
To emphasize seeded heteroepitaxial growth using crystalline cores with distinct chemistries.
To enable the design of segmented nanoparticles with spatially defined compositions and functionalities.

Main Methods:

Utilizing seeded growth in the living crystallization-driven self-assembly (CDSA) method.
Investigating polymer crystallization principles for nanoparticle assembly.
Employing crystalline cores with distinct chemistries for heteroepitaxial growth.

Main Results:

Demonstrated the intrinsic mechanism of epitaxial crystallization in living CDSA.
Revealed the in-depth mechanism of seeded heteroepitaxial crystallization.
Summarized synthetic processes for 2D hollow platelets with unique architectures.

Conclusions:

Understanding heteroepitaxial crystallization expands the design of segmented nanoparticles.
This approach allows for precise control over core compositions and functionalities.
The method is particularly relevant for creating advanced soft matter structures.