ice there is obtained a black powdery mass which crumbles on contact to yield a very fine divided powder sample a microcalorimetric analysis is carried out to show the structure of the product the test is conducted in the following manner 50 mg of sample a is weighed into a calibrated aluminum capsule the capsule is crimped up and placed in the calorimetry tube of a perkin elmer dsc2 the thermal power input c vertical axis microcalories per second is plotted as a function of temperature t horizontal axis degrees kelvin the rate of temperature increase is set at 20 u00b0 c per minute there is obtained the curve iii which is compared with the curve i for sulfur alone and the curve ii for polyacetylene alone curve iii proves that the polysulfurated chain is associated with the polyacetylene there appears a spike corresponding to a sulfur containing complex 100 mg of sulfur are dissolved in 7 cm 3 of liquid ammonia this solution is brought into contact with 50 mg of polyacetylene so that all the powder is wetted by the solution a reaction occurs between the two compounds the color of the sulfur solution changing progressively from blue to yellow the liquid ammonia is slowly evaporated at a temperature of 20 u00b0 c at atmospheric pressure there forms a polysulfide of ammonium and carbocation as revealed by the elementary analysis in this case the length of the polysulfurated chain is limited to s 6 but this chain can be lengthened by direct reaction with sulfur at 160 u00b0 c there is obtained a sample b which is submitted to dsc analysis as described above.