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Swelling Dynamics of Liquid Crystalline Elastomers

Jun Geng Lquid Crystal Institute Kent State University. Swelling Dynamics of Liquid Crystalline Elastomers. Advisor: Dr. Peter Palffy-Muhoray. Outline. Liquid crystal elastomer (LCE) sample details and preparation Analysis of swelling based on Van der Waals intermolecular potential

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Swelling Dynamics of Liquid Crystalline Elastomers

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  1. Jun Geng Lquid Crystal Institute Kent State University Swelling Dynamics of Liquid Crystalline Elastomers Advisor: Dr. Peter Palffy-Muhoray

  2. Outline • Liquid crystal elastomer (LCE) sample details and preparation • Analysis of swelling based on Van der Waals intermolecular potential • Solvent swelling experiment • Solvent vapor swelling experiment 2 Liquid Crystal Institute, KSU

  3. LCE Details & Preparation Finkelmann Spin Cast Nematic side chain LCE methylsiloxane backbone biphenyl mesogen (side group)‏ tri-functional crosslinker 3 Liquid Crystal Institute, KSU

  4. Simple Analysis 4 Liquid Crystal Institute, KSU

  5. Solvent Swelling Experiment • Designed measurement cell to simultaneously monitor • Initial problems: • Solvent leaking • UV glue degradation 5 Liquid Crystal Institute, KSU

  6. Swelling Experiment solvent pump sample holder solvent reservoir

  7. LCE L3 director L2 L1

  8. Solvent Vapor Swelling

  9. Normal Rubber: RTV Toluene Vapor Liquid Crystal Elastomer Toluene LCE Bi-Rubber Strip Swelling 9 Liquid Crystal Institute, KSU

  10. Conclusion

  11. Thanks to: Jeremy taught me how to use those machines in machine shop and supervised my activities, Paul who showed me how to make the elastomers, Michele who lent me a key to the lab, and Jake who told jokes sometimes.

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