NMR study on mechanisms of ionic polymer-metal composites deformation with water content
State Key Laboratory of Mechanical Structure Strength and Vibration, Xi'an Jiaotong University Xi'an, 710049, PRC
2 School of Mechanical Engineering, Xi'an Jiaotong University - Xi'an, 710049, PRC
3 Niumag Corporation - Shanghai, 200333, PRC
Accepted: 29 August 2011
Ionic polymer-metal composites (IPMCs) exhibit a large dynamic bending deformation under exterior electric field. The states and proportions of water within the IPMCs have great effect on the IPMCs deformation properties. This letter investigates the influence of the proportion changes of different types of water on the deformation, which may disclose the working mechanisms of the IPMCs. We give a deformation trend of IPMCs with the reduction of water content firstly. Then by the method of nuclear magnetic resonance, various water types (water bonded to sulfonates, loosely bound water and free water) of IPMCs and their proportions are investigated in the drying process which corresponds to their different deformation states. It is obtained that the deformation properties of IPMCs depend strongly on their water content and the excess free water is responsible for the relaxation deformation.
PACS: 77.65.-j – Piezoelectricity and electromechanical effects / 82.56.-b – Nuclear magnetic resonance / 61.25.hp – Polymer swelling, cross linking
© EPLA, 2011