PhD Dissertation Defense
Investigation of Polymer Liquid Systems
through Distant Dipolar Field Effects
Department of Physics
Universitry of Connecticut
We report the observation of distant dipolar field (DDF) effects in polymer melts. Using the COSY revamped by asymmetric z-gradients (CRAZED) sequence, we have succeeded in obtaining DDF double quantum echoes in melts of poly(isobutylene). In this system, T2 relaxation time is about 3ms. This requires the use of very strong gradient pulses, which are generated using a home-built gradient probe assembly with a car battery as current source. Experiments of this type would be very useful in investigating the structure of polymer systems. Motivated by such applications, we report theoretical and experimental results for a suspension of PTFE spheres of various diameters in PIB.
Monday, June 4, 2007
Gant Science Complex