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Temperature-Induced Transitions of Tri-block Copolymer Micelles: SANS Analysis

Explore micelle transitions with temperature changes using SANS and structural information, transition temperature, aggregate size, and compositional details.

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Temperature-Induced Transitions of Tri-block Copolymer Micelles: SANS Analysis

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  1. NG-3 SANS: Tri-block Copolymer Monomer to Micelle Transitions with Change in Temperature Red Group

  2. PEO-Hydrophobic PEO PEO P-85 Pluronics Fully Extended Collapsed

  3. Why SANS? • Structural Information • Transition Temperature • Size of Aggregates • Compositional Information • Is the core completely PPO • How solvated are the polymer “whiskers”

  4. cold neutrons beam shutter area detector sample area BEAM BEAM ON OFF velocity selector collimation 15 m 15 m NG-3 System Overview • Why use two detector distances? • Scan whole Q-range • 0.0239 – 0.4742Å-1 for small source to sample • 0.0035 – 0.0491 Å-1 for large source to sample • Less detector distances allow for many samples

  5. P85 10 wt.% 10 oC Rg=1.16 nm Scale = 0.36 Scale F(Rg)

  6. P85 10 wt.% 50 oC 50 oC 10 oC dShell= 2.7 nm RCore= 4.7nm • = 0.25 PolyCore=0.15 D2O:PEO in shell 28.5 Agg. Number 78

  7. P85 10 wt.% 25 oC 50 oC 25 oC 10 oC Rg=1.16 nm Scale = 0.36 dShell= 2.7 nm RCore= 4.7nm f = 0.25

  8. Conclusions • Using SANS the temperature-dependent morphology of P85 was characterized • Contrast-matching may allow confirmation of the modeling results

  9. Acknowledgements Special thanks to: Paul Butler and Joe Dura Boualem Hammouda & Steve Kline Everyone at NCNR

  10. Questions?

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