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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
Published on: September 26, 2016
Highly Emissive, Optically Active Poly(diphenylacetylene) Having a Bulky Chiral Side Group
Hyojin Kim1,2, Kyo-Un Seo1, Young-Jae Jin1
1School of Applied Chemical Engineering, Major in Polymer Science and Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea.
A novel chiral polymer, NpSi*-PDPA, exhibits strong optical activity and high photoluminescence. Annealing enhances its circular dichroism signal, demonstrating potential for advanced optical applications.
Area of Science:
- Polymer Chemistry
- Materials Science
- Optoelectronics
Background:
- Chiral polymers offer unique optical properties.
- Poly(diphenylacetylene)s are known for their emissive characteristics.
- Developing optically active polymers with high performance is crucial for advanced applications.
Purpose of the Study:
- To synthesize and characterize a novel, highly emissive, and optically active poly(diphenylacetylene) derivative.
- To investigate the photophysical properties and chiroptical behavior of the synthesized polymer.
- To explore the effect of annealing on the circular dichroism of the polymer.
Main Methods:
- Synthesis of NpSi*-PDPA via introduction of a bulky chiral pendant group.
- Characterization of structure, photoluminescence (PL), and circular dichroism (CD).
- Annealing studies to evaluate changes in CD intensity.
Main Results:
- NpSi*-PDPA synthesized with high fractional free volume (0.29).
- Demonstrated strong photoluminescence (PL quantum yield up to 56.1%) and long PL lifetime.
- Exhibited significant circular dichroism (CD) signal (gCD of 0.90 × 10⁻³), enhanced to 7.10 × 10⁻³ after annealing.
Conclusions:
- NpSi*-PDPA is a highly emissive and optically active polymer with a disordered structure.
- The polymer's chiroptical properties can be significantly enhanced through thermal annealing.
- This material shows promise for applications in advanced optical devices and chiral sensing.
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