Abstract

Abstract : Having generated and identified a carbon thirteen NMR signal arising exclusively from PC chains the PC/PS interface, we can now perform NMR relaxation experiments to characterize the microscopic dynamics of these chains. A difference pulse sequence is used which includes a period for carbon dephasing under the influence of dipolar coupling to protons isolated from one another by multiple-pulse H-H decoupling. Thus, the full experiment involves monitoring the dephasing of DNP-enhanced 13C NMR magnetization of interface PC chains in a thin-film PC/PS blend by dipolar rotational spin echo (DRSE) 13 C NMR. The results of DRSE experiments have been well established for the characterization of the molecular chain dynamics of synthetic polymers and proteins.

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