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Dielectric spectroscopy investigatio...

Atorngitjawat, Pornpen.

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Dielectric spectroscopy investigation of ion-containing and intermolecular hydrogen-bonded polymer systems.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Dielectric spectroscopy investigation of ion-containing and intermolecular hydrogen-bonded polymer systems./
Author:	Atorngitjawat, Pornpen.
Description:	181 p.
Notes:	Adviser: James Runt.
Contained By:	Dissertation Abstracts International68-05B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3266070
ISBN:	9780549044321

Dielectric spectroscopy investigation of ion-containing and intermolecular hydrogen-bonded polymer systems.
Atorngitjawat, Pornpen.

Dielectric spectroscopy investigation of ion-containing and intermolecular hydrogen-bonded polymer systems. - 181 p.

Adviser: James Runt.

Thesis (Ph.D.)--The Pennsylvania State University, 2007.

Ion-containing and intermolecular hydrogen-bonded polymers are used widely in a variety of industrial and commercial applications, from food packaging to battery electrolytes to pharmaceuticals. Yet the dynamics of these polymers, which are both complex and important to the application, are poorly understood. This thesis provides the first systematic study of the dynamics of several ion-containing and intermolecular hydrogen-bonded polymers by broadband dielectric relaxation spectroscopy. The systems under consideration include sulfonated polystyrene (SPS) in acid (SPS-H) and neutralized forms, and mixtures of poly(2-vinylpyridine) (P2VPy) with lithium perchlorate (LiClO4) and low molecular weight phenolic molecules. Dynamic mechanical analysis, Fourier transform infrared spectroscopy, differential scanning calorimetry, small-angle X-ray scattering and wide-angle X-ray diffraction were employed in a complementary role.

ISBN: 9780549044321Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Dielectric spectroscopy investigation of ion-containing and intermolecular hydrogen-bonded polymer systems.
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020 $a 9780549044321
035 $a (UMI)AAI3266070
035 $a AAI3266070
040 $a UMI $c UMI
100 1 $a Atorngitjawat, Pornpen. $3 1280712
245 1 0 $a Dielectric spectroscopy investigation of ion-containing and intermolecular hydrogen-bonded polymer systems.
300 $a 181 p.
500 $a Adviser: James Runt.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3319.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2007.
520 $a Ion-containing and intermolecular hydrogen-bonded polymers are used widely in a variety of industrial and commercial applications, from food packaging to battery electrolytes to pharmaceuticals. Yet the dynamics of these polymers, which are both complex and important to the application, are poorly understood. This thesis provides the first systematic study of the dynamics of several ion-containing and intermolecular hydrogen-bonded polymers by broadband dielectric relaxation spectroscopy. The systems under consideration include sulfonated polystyrene (SPS) in acid (SPS-H) and neutralized forms, and mixtures of poly(2-vinylpyridine) (P2VPy) with lithium perchlorate (LiClO4) and low molecular weight phenolic molecules. Dynamic mechanical analysis, Fourier transform infrared spectroscopy, differential scanning calorimetry, small-angle X-ray scattering and wide-angle X-ray diffraction were employed in a complementary role.
520 $a Multiple relaxations were generally observed at high temperatures. For SPS ionomers, the segmental process, Maxwell-Wagner-Sillars interfacial polarization, and electrode polarization were detected. Three relaxations were also found in spectra of SPS-H, attributed to the segmental process, hydrogen bond association/dissociation, and electrode polarization.
520 $a Three dielectric relaxations above the segmental process were observed for P2VPy-LiClO4 mixtures: ion-mode relaxation, slow hindered segmental relaxation and electrode polarization. However, only electrode polarization was observed above the segmental relaxation for all P2VPy--small phenolic molecule mixtures, except P2VPy + 10 mol% 2,3,3,4,4,5-hexahydroxybenzophenone. This mixture exhibited an additional relaxation due to Maxwell-Wagner-Sillars interfacial polarization, arising from the existence of phase-separated complexes within the P2VPy matrix.
520 $a Sub-Tg local relaxations were suppressed by ionic intermolecular interactions for SPS ionomers and P2VPy-LiClO4 mixtures. Intermolecular hydrogen bonding also suppressed the local relaxation in P2VPy-small phenolic molecule mixtures by decreasing the mobility of the pyridine-side groups. Both the concentration of small phenolic molecules and the number of hydroxyl groups per molecule played an important role in suppression of the local relaxation, which was significant for all mixtures where the small molecules contained more than one hydroxyl group per molecule.
590 $a School code: 0176.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0794
710 2 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 68-05B.
790 $a 0176
790 1 0 $a Runt, James, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3266070