Broadband dielectric spectroscopy poly

Figure 15 Imaginary part e" vs. frequency for amorphous poly(ethylene terephtalate) at temperatures as indicated in K (temperature steps 2.5 K). The solid line is the fit using two superimposed Havriliak-Negami relaxation functions. If not indicated, the error bars are not larger than the size of the symbols. Taken from Kremer, F. Schdnhals, A. In Broadband Dielectric Spectroscopy Kremer, F. Schonhals, A., Eds. Springer, 2003 Chapter 4 with permission.

Nalawade A, Hassan MK, Jarrett WA et al (2011) Broadband dielectric spectroscopy studies of glassy-state relaxations in annealed poly (2,5-benzimidazole). Polym Int 61 55-64... 

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. 

Kessairi, K., Napolitano, S., Cappacioli, S., Rolla, P., and Wiibbenhorst, M. (2007) Molecular dynamics of atactic poly (propylene) investigated by broadband dielectric spectroscopy. Macromolecules, 40, 1786. 

The organization of the present chapter is as follows. Dielectric techniques for molecular dynamics studies, in particular broadband dielectric spectroscopy (DS) and thermally stimulated depolarization currents (TSDC) techniques are shortly presented in the next section. Section 3, devoted to ionic conductivity measurements and analysis, focuses mostly on analysis, as the measuring techniques and equipment are often similar to those used for DS. The microphase separation and morphology of segmented PUs is discussed in the following Section 4, which completes the first introductory part of the chapter. Results obtained with selected PTE are presented in Section 5, followed by a larger Section 6 devoted to PU ionomers with ionic moieties in either of the HS and SS. PU ionomers of the latter type are often based on poly(ethylene oxide) (PEO) as the SS component and, for this reason. Section 6 includes a discussion of telechelics based on PEO, which may serve as model systems for PU ionomers. In Section 7, we discuss recent results obtained with nanocomposites based on PTE, a topic attracting much current interest, before we conclude with Section 8. 

Mapesa, E.U., Tress, M., Schulz, G., Huth, H., Schick, C., Reiche, M., Kremta-, F. Segmental and chain dynamics in nanometric layers of poly(cis-l,4-isoprene) as studied by broadband dielectric spectroscopy and temperature-modulated calorimetry. Soft Matter 9 (44), 10592-10598 (2013)... 

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