Anhydrous Poly(2,5-benzimidazole)-Poly(vinylphosphonic Acid) Acid-Base Polymer Blends: a Detailed Solid-State NMR Investigation

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28247

Title:	Anhydrous Poly(2,5-benzimidazole)-Poly(vinylphosphonic Acid) Acid-Base Polymer Blends: a Detailed Solid-State NMR Investigation
Authors:	Akbey,U;Graf,R;Chu,PP;Spiess,HW
Contributors:	中央大學
Keywords:	PROTON-CONDUCTING PROPERTIES;FUEL-CELLS;PHOSPHONIC ACID;DYNAMICS;SPECTROSCOPY;H-1-NMR;SYSTEMS
Date:	2009
Issue Date:	2010-06-29 19:44:51 (UTC+8)
Publisher:	化學研究所
Abstract:	The present study aims at understanding the molecular structure and dynamics of the acidic polymer poly(vinylphosphonic acid) (PVPA) blended with the basic polymer poly(2,5-benzimidazole) (ABPBI) under anhydrous conditions. The extent of the acid-base complexation is probed at different mixing ratios. Advanced H-1, C-13, and P-31 solid-state NMR methods are used to investigate the structural features in these systems. In addition, molecular dynamics is studied by variable-temperature H-1 magic angle spinning and one-dimensional double-quantum NMR methods. Many different types of hydrogen-bonding are identified in the acid-base complexes. Addition of the acidic PVPA to the basic ABPBI changes the molecular packing arrangements of the ABPBI moieties with hydrogen-bond formation as the driving force. The complex with a 1:1 mixing ratio has the lowest activation energy for proton mobility, and at the same time contains the most structured hydrogen-bonded protons. The results show that molecular-level mixing is achieved for the complexes.
Relation:	AUSTRALIAN JOURNAL OF CHEMISTRY
Appears in Collections:	[Graduate Institute of Chemistry] journal & Dissertation

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