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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: Sep 22, 2025

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

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

Published on: June 20, 2019

Precise Microstructure Self-Stabilized Polymer Nanocrystals.

Patrick Ortmann¹, Justyna Trzaskowski¹, Marina Krumova¹

¹Chair of Chemical Materials Science, Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.

ACS Macro Letters

|May 18, 2022

Summary

This summary is machine-generated.

Precise polymer microstructure engineering creates self-stabilizing polymer nanoparticles. Carboxy groups spaced along polyethylene chains dictate nanocrystal size and thickness for controlled material properties.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Area of Science:

Polymer Chemistry
Materials Science
Nanotechnology

Background:

Controlling nanoparticle size and surface chemistry is crucial for material properties.
Current methods for nanoparticle synthesis often lack precise control over these features.

Purpose of the Study:

To develop a method for synthesizing polymer nanoparticles with defined shapes and surface chemistry.
To demonstrate how polymer microstructure can directly encode nanocrystal characteristics.

Main Methods:

Synthesis of linear polyethylene chains with precisely spaced carboxy groups using acyclic diene metathesis polymerization (ADMET).
Utilizing long-chain α,ω-dienes with specific branching to control polymer microstructure.
Characterization of the resulting nanocrystals and their self-stabilizing properties in an aqueous medium.

Main Results:

Nanoparticles with controlled crystal size and defined surface chemistry were successfully synthesized.
Hydrophilic carboxy groups on the polymer chains formed a stabilizing layer on the nanocrystal surface.
Nanocrystal thickness was directly predetermined by the length of the methylene spacer between functional groups.

Conclusions:

Polymer microstructure engineering offers a direct route to control nanoparticle size, shape, and surface chemistry.
The precise placement of functional groups enables self-stabilization of nanoparticles in aqueous solutions.
This approach provides a versatile platform for designing advanced polymer nanomaterials.