Abstract
Measurement of swelling of cis polyacetylene during doping with iodine or sodium, and the relative compensations, have been carried out by an original technique. The use of a tensile micromachine has allowed in situ conductivity and precise length measurements. A linear dependence of volume with iodine concentration per carbon atom y I , is observed over a wide range of concentration (5% > y I > 13%). A 1% y I increase causes a 3% volume expansion. This value is very close to the one deduced from the structural model of Baughman et al. Similar results are obtained with sodium doping. During doping, compensation, and redoping, a continuous volume increase is observed, up to a 40% augmentation. Thus the volume effects of the dopants in the sample are cumulative.
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