NG-3 SANS: Tri-block Copolymer Monomer to Micelle Transitions
with Change in Temperature
Red Group
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
PEO
PEO
PEO-Hydrophobic
P-85 Pluronics
Collapsed Fully Extended
Why SANS?
Structural InformationTransition TemperatureSize of Aggregates
Compositional Information Is the core completely PPOHow solvated are the polymer “whiskers”
velocity selector collimation
samplearea
area detectorbeamshutter
15 m 15 m
coldneutrons
BEAM BEAM ON OFF
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
NG-3 System Overview
P85 10 wt.% 10 C
2gqRx Rg=1.16 nm
Scale = 0.36 2
2 12xxeZV
dd x
m
Scale F(Rg)
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
dShell= 2.7 nm
P85 10 wt.% 50 oC
RCore= 4.7nm
= 0.25
PolyCore=0.15
10 oC
50 oC
)()( qSqFndd
p
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
D2O:PEO in shell 28.5
Agg. Number 78
dShell= 2.7 nm
P85 10 wt.% 25 oC
RCore= 4.7nm
= 0.25
10 oC
50 oC
MonomerpCoreShellp qFnqSqFn
dd )()()(
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
P85 Phase Diagram
Reference: K. Mortensen, J. Phys., Condens. Matter 8, A103 (1996)
Rg=1.16 nm
Scale = 0.36
25 oC
Conclusions
• Using SANS the temperature-dependent morphology of P85 was characterized
• Contrast-matching may allow confirmation of the modeling results
Acknowledgements
Special thanks to:Paul Butler and Joe DuraBoualem Hammouda & Steve KlineEveryone at NCNR
Questions?