Neutron Scattering

The pair correlation function arising from the segment motion within one given chain is
observed, if some protonated chains are dissolved in a deuterated matrix. Fig .15 .11 displays
the observed spectra from polyethylethylene (90% dPEE, 10% hPEE) at a molecular weight
of Mw = 20.000 . The solid lines give the prediction of the dynamic structure factor of
Eq .[15 .19 ] . Obviously veiy good agreement is achieved.
a 0.2
0 2 4 6 8 10
Q 202F
Figure 15.10 : Self correlation for a PDMS melt T = 100C . The data at different momentum
transfers are plotted us the scaling variable ofthe Rouse model (6 - Ë) .
0.8-
PEE Homopolymer, T=473K
0 .05
0 .08
0 .10
0 .121
0 .2 -
Rouse
0. ~87
Q/A -i
0 -f
0 10
t/ns
Figure 15 .11 : Single chain structure factor from a PEE melt at 473K . The solid lines
represent a joint fit with the Rouse model .
1
20
15- 1 7