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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

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Published on: February 6, 2016

Stimuli-responsive epoxy coatings.

Liming Tang¹, John Whalen, Grant Schutte

¹Department of Macromolecular Science and Engineering, Case Western Reserve University, 2100 Adelbert Road, Cleveland, Ohio 44106-7202, USA.

ACS Applied Materials & Interfaces

|April 2, 2010

Summary

This summary is machine-generated.

New epoxy coatings with built-in chemical and temperature sensors change color permanently when exposed to heat or chemicals. These smart materials offer visual detection for various stimuli.

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Area of Science:

Polymer Science
Materials Chemistry
Sensor Technology

Background:

Development of advanced materials for sensing applications is crucial.
Epoxy resins offer versatile matrices for incorporating functional components.
Chromogenic and fluorescent dyes can report on environmental changes.

Purpose of the Study:

To design and characterize novel epoxy coatings with integrated chemical and temperature sensors.
To investigate the mechanism of optical property changes in response to stimuli.
To explore the tunability of sensor response based on material composition.

Main Methods:

Synthesizing epoxy resins with dissolved oligo(p-phenylenevinylene) dye.
Curing polymer mixtures at high temperatures (180-200°C) and quenching.
Exposing materials to elevated temperatures above glass transition temperature (T(g)) and chemical stimuli.
Characterizing changes in optical absorption and fluorescence properties.

Main Results:

Kinetically trapped epoxy/dye blends exhibit irreversible dye aggregation above T(g).
Temperature and chemical exposure (water, acid, base, organic compounds) induce significant optical changes.
Changes in fluorescence and absorption spectra indicate sensor activation.
Response is predictable via kinetic models and controllable via resin/dye composition.

Conclusions:

Novel epoxy coatings function as visual chemical and temperature sensors.
Irreversible optical changes provide a permanent record of stimulus exposure.
Material design allows for tuning sensor sensitivity and response characteristics.