NG7 Reflectometer Langmuir Monolayer study of tethered polymer brushes

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NG7 Reflectometer Langmuir Monolayer study of
tethered polymer brushes

• Green team
• Summer School 2006

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Sample system
PDMS poly(dimethy siloxane) SLD7x 10-8
Å-2 d-PS poly(styrene) SLD6.4 x 10-6
Å-2 Solvent dioctyl phthalate (DOP) SLD.618 x
10-6 Å-2
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NG-7 Reflectometer
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Fitted SLD profiles from different models
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Reflectivity profile for different MW
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Tethered polymer profiles at different MW

• ? ?01-(z/L0)21/2

M.W. (k) PDMSdPS H(Å) ?0
28-330 790 0.15
20-170 525 0.19
11-66 280 0.31
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Conclusion

• Higher MW, further stretching into the solvent
• Tethered Chain model describes profile reasonably
  well

Acknowledgments Red, Orange, Yellow, Blue,
Purple Groups NCNR