solid-state NMR study of conformation and dynamics of block co-polymer composites
EMSL Project ID
2187
Abstract
The objective of this proposal is to use the high resolution solid-state NMR to study the conformation and dynamics of block co-polymer composites. Using PI-b PEO/GLYMO/aluminum-sec-butoxide composites as an example, we can study: a) the position of the interface and interfacial mixing, b) the mobility, and c) the domain size. NMR can be used to determine whether there is a sharp interface between the PI and PEO segment, and whether the inorganic species are mixed with the PEO segment on a molecular level. The domain sizes and interphase mixing can be obtained by spin diffusion experiment. Molecular dynamics are likely to occur in many regions of the surface bound polymeric or organic molecules. Regions that may not exhibit mobility would include regions strongly interacting with the inorganic surface, thus molecular dynamics are able to probe the organic-surface interaction strength. Dynamics can be probed in many different ways with solid state NMR. Relaxation time measurements and two-dimensional wideline separation spectroscopy (2D-WISE) can give insight into the relative mobilities of different regions of the materials. Both the 300 and 500 MHz solid state NMR spectrometers are required for this proposed study.
Project Details
Project type
Capability Research
Start Date
2001-04-15
End Date
2003-02-17
Status
Closed
Released Data Link
Team
Principal Investigator