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Swelling Dynamics of Liquid Crystalline Elastomers
Jun GengLquid Crystal InstituteKent State University
Advisor: Dr. Peter Palffy-Muhoray
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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
2Liquid Crystal Institute, KSU
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LCE Details & Preparation
3Liquid Crystal Institute, KSU
Finkelmann Spin Cast Nematic side chain LCE
Si O
CH3
H
O C
O
O OCH3
O
O
O
O C
O
O
CH3
CH3
CH3CH3
CH3
n
9
9
9
1
2
3
4
100 mol.%
72 mol.%
18 mol.%
10 mol.%
Si O
CH3
H
O C
O
O OCH3
O
O
O
O C
O
O
CH3
CH3
CH3CH3
CH3
n
9
9
9
1
2
3
4
100 mol.%
72 mol.%
18 mol.%
10 mol.%
Si O
CH3
H
O C
O
O OCH3
O
O
O
O C
O
O
CH3
CH3
CH3CH3
CH3
n
9
9
9
1
2
3
4
100 mol.%
72 mol.%
18 mol.%
10 mol.%
Si O
CH3
H
O C
O
O OCH3
O
O
O
O C
O
O
CH3
CH3
CH3CH3
CH3
n
9
9
9
1
2
3
4
100 mol.%
72 mol.%
18 mol.%
10 mol.%
Si O
85
CH3
H
methylsiloxane backbone
tri-functional crosslinker
biphenyl mesogen(side group)
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Simple Analysis
4Liquid Crystal Institute, KSU
¢ f = ¢ fnem atic+ ¢ fm ix + ¢ felastic
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Solvent Swelling Experiment Designed measurement cell
to simultaneously monitor Initial problems:
Solvent leaking UV glue degradation
5Liquid Crystal Institute, KSU
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Swelling Experiment
solvent reservoir
solvent pump sample
holder
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L1
L2
L3director
LCE
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Solvent Vapor Swelling
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LCE Bi-Rubber Strip Swelling
9Liquid Crystal Institute, KSU
Normal Rubber: RTV
Liquid Crystal Elastomer
Toluene
Toluene Vapor
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Conclusion
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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.