TY - JOUR
T1 - Anhydrous poly(2,5-benzimidazole) - Poly(vinylphosphonic acid) acid - Base polymer blends
T2 - A detailed solid-state NMR investigation
AU - Akbey, Ümit
AU - Graf, Robert
AU - Chu, Peter P.
AU - Spiess, Hans Wolfgang
N1 - Funding Information:
The authors thank Dr Sivakumar Sekharan and Dr Daniel Sebastiani for their support on quantum chemical calculations of the ABPBI monomer. Financial support is acknowledged from the Bundesministerium für Bildung und Forschung (project DryD under contract no. 0329567).
PY - 2009
Y1 - 2009
N2 - 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 1H, 13C, and 31P solid-state NMR methods are used to investigate the structural features in these systems. In addition, molecular dynamics is studied by variable-temperature 1H 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.
AB - 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 1H, 13C, and 31P solid-state NMR methods are used to investigate the structural features in these systems. In addition, molecular dynamics is studied by variable-temperature 1H 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.
UR - http://www.scopus.com/inward/record.url?scp=69049087997&partnerID=8YFLogxK
U2 - 10.1071/CH09066
DO - 10.1071/CH09066
M3 - 期刊論文
AN - SCOPUS:69049087997
SN - 0004-9425
VL - 62
SP - 848
EP - 856
JO - Australian Journal of Chemistry
JF - Australian Journal of Chemistry
IS - 8
ER -