Broadband dielectric spectroscopy modem

Broadband dielectric spectroscopy (BDS) is a versatile experimental tool to study the dynamics of polymeric systems. In its modem form it covers the extraordinary frequency range from 10 Hz to 10 Hz with the option to extend both limits to lower and higher values, respectively. This enables one to analyse the molecular d3mamics on a large time scale especially if the temperature of the sample is varied as well. In the present review article examples will be discussed for polymers of widely varying molecular architectures (linear and cyclic chains, star-branched systems, and liquid crystalline polymers). 

In this chapter broadband dielectric spectroscopy (BDS) is employed to polymeric blend systems. In its modem form BDS can cover an extraordinary broad frequency range from 10 " to 10 Hz. Therefore, molecular and collective dipolar fluctuations, charge transport, and polarization effects at inner phase boundaries can be investigated in detail including its temperature dependence. 

Modem broadband dielectric spectroscopy is a very useful tool to interrogate the molecular dynamics of polymers because response over a broad frequency range from the milli- to giga-Hertz region is possible (10). Therefore, motional processes which take place in polymers on extremely different time scales can be investigated vs. temperature. Moreover, the motional process depends on the morphology of the system. 

This chapter reports the use of modem broadband dielectric spectroscopy as a novel approach in the study of the degradation of hydroxyl-terminated poly(D,L-lactide) materials from the perspective of modified macromolecular motions. As this technique is largely unfamiliar to the community engaged in the pursuit of biodegradable materials, fundamental explanations are provided where needed in this chapter. The analysis outlined here can be considered as useful in a broader context of materials that are degraded in similar ways, such as proton exchange membranes that are exposed to generated peroxide in fuel cells. 

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