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

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

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

4. NG-3 System Overview Why use two detector distances?
velocity
selector
collimation
sample
area
area detector
beam
shutter
15 m
cold
neutrons
ON OFF
BEAM BEAM
NG-3 System Overview
Why use two detector distances?
Scan whole Q-range
– Å-1 for small source to sample
– 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 D2O:PEO in shell 28.5 Agg. Number 78
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 f = 0.25 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?