| http://www.w3.org/ns/prov#value | - over a duration of between 1 and 100 hours in an atmosphere inert to the precursor polymer (V) and to the poly(acetylene), wherein in the general formulae IV, V and VI each of the groups R1 and R2 either (a) represent a radical selected from H, CX3, Cm H2m+1 and COOR5 wherein X is a halogen atom, m has a value between 1 and 4 and R5 is an alkyl group with 1-4 carbon atoms,
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