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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Published on: May 15, 2017

Copolymer logical switches adjusted through core-shell micelles: from temperature response to fluorescence response.

Qiang Yan¹, Jinying Yuan, Weizhong Yuan

¹Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, People's Republic of China.

Chemical Communications (Cambridge, England)

|December 17, 2008

Summary

Novel polymer micelles with a fluorescent group exhibit temperature-responsive fluorescence. Lower temperatures increase fluorescence by stretching polymer chains, while higher temperatures decrease it by shrinking chains.

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Area of Science:

Polymer Chemistry
Materials Science
Fluorescence Spectroscopy

Background:

Stimuli-responsive polymers are crucial for advanced materials.
Poly(N-isopropylacrylamide) (PNIPAM) is a well-known thermoresponsive polymer.
Block copolymers offer unique self-assembly properties.

Purpose of the Study:

To synthesize and characterize novel PS-b-PNIPAM block copolymers with a fluorescent group at the junction.
To investigate the temperature-dependent fluorescence behavior of micelles formed by these copolymers.
To establish a link between polymer chain conformation and fluorescence output.

Main Methods:

Synthesis of styrene-NIPAM block copolymers (PS-b-PNIPAM) with a conjugated fluorescent group (CEA).
Micelle formation in aqueous solution.
Temperature-controlled fluorescence spectroscopy to monitor CEA excimer formation.

Main Results:

The PS-b-PNIPAM micelles exhibited distinct changes in fluorescence intensity with temperature variations.
At lower temperatures, PNIPAM chain stretching increased CEA mobility, favoring excimer formation and higher fluorescence.
At higher temperatures, PNIPAM chain shrinking isolated CEA groups, reducing excimer formation and fluorescence.

Conclusions:

The synthesized PS-b-PNIPAM micelles demonstrate logical, temperature-controlled fluorescence switching.
This behavior is attributed to the conformational changes of the PNIPAM chains affecting the fluorescent group's environment.
These materials show potential for applications in sensors and smart materials.