Abstract
A novel method, the bending beam method (BBM), is introduced to study ion transport in an electroactive polymer, polypyrole (PPy). Volume changes in PPy are studied by observing the bending behavior of a bipolymer laminate strip, made of a PPy layer and a polyethylene layer, during electrochemical redox of the PPy. On reduction in an aqueous solution of lithium perchlorate, methane sulfonate doped and perchlorate doped PPy's shrink rapidly, whereas a dodecylbenzene sulfonate doped PPy swells rapidly. A tosylate doped PPy undergoes initial rapid swelling followed by rapid shrinking. We interpret these phenomena as due to different ion transport modes. Relaxation is generally observed to be associated with volume shrinking in all reduced PPy's and is attributed to a structural relaxation in the polymer matrix. The BBM technique provides a new sensitive way to detect in situ mass transport in electroactive polymers.
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