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Published on: May 20, 2014
Polymorph selectivity of an AIE luminogen under nano-confinement to visualize polymer microstructures
Michidmaa Khorloo1, Yanhua Cheng1,2, Haoke Zhang1,3
1Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China tangbenz@ust.hk.
This study introduces a novel polymorphic luminogen with aggregation-induced emission (AIE) that changes color based on its location within polymer phases. This allows for precise visualization of polymer microstructures and crystallinity.
Area of Science:
- Materials Science
- Polymer Chemistry
- Supramolecular Chemistry
Background:
- Understanding confined behavior of luminescent molecular assemblies in polymers is challenging.
- Aggregation-induced emission (AIE) luminogens offer unique optical properties.
Purpose of the Study:
- To develop a polymorphic luminogen for selective growth in polymer amorphous and crystalline phases.
- To enable visualization and measurement of polymer microstructures using distinct fluorescence colors.
Main Methods:
- Incorporation of a polymorphic AIE luminogen into a polymer network.
- Observation of distinct emission colors (green and yellow) corresponding to amorphous and crystalline phases.
- Utilizing the AIE luminogen as a fluorescent marker for microstructural analysis.
Main Results:
- The AIE luminogen exhibits polymorphic behavior dependent on nano-confinement size within the polymer.
- A stable green-emitting polymorph is observed in the amorphous phase.
- A metastable yellow-emitting polymorph is observed in the crystalline phase.
Conclusions:
- The AIE luminogen acts as a single-molecule probe for visualizing polymer microstructures and measuring crystallinity.
- Confinement of AIE luminogens in polymer networks enables free space recognition.
- This strategy correlates microscopic polymer morphologies with macroscopic optical signals.
