Angular Scattering of Electrons in Hydrogen and Helium by Harnwell G. P.

By Harnwell G. P.

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21a and b) [258] to give semiconducting materials (with conductivities up to lo-' Scm-I). Attempts to polymerise pyrrole dimers and trimers were not initially very successful, with evidence for the formation of short chain oligomers rather than continuous films [256], but good quality films have since been obtained using the dimer [257]. The oxidation potential of the oligomer decreases linearly with the number of pyrrole units [256] -probably due to the increased stability of the radical cation, which may also allow the diffusion of the radical further from the electrode surface with subsequent reactions other than polymerisation occurring.

Some reports exist in the literature of copolymers of pyrrole with thiophene [83] formed from the two monomers, and also from a trimer (2,5-di(-2-thienyl)-pyrrole) containing pyrrole linked to two thiophene rings via the a positions [160] (Fig. 1 Scm-' and which is soluble in acetonitrile, retaining its original conductivity on evaporation of the solvent. The polymerisation of bicyclic monomers containing joined pyrrole and thiophene rings [272] sharing a common bond have also been reported (Fig.

P. Evans A al v c D 0 L 0 D " l 4 - I . I I 300 500 700 Aim1 Fig. 15. Visible spectrum of azulene and polyazulene-C10, (on Nesa glass). A. 5 Poly(parapheny1ene) (Fig. 3) Like many of the other conjugated polymers poly(parapheny1ene) was initially prepared via chemical synthesis (in a highly crystalline form) [30,86,87,224-2261 and could not easily be produced in forms other than as a powder. Ivory et al. [227] demonstrated that the material could be chemically doped to a highly conducting state (up to lo4 S cm- I), since when electrochemical synthesis of the polymer has been achieved via a number of different monomers [38,4&49,228-231], producing material with a range of conductivities (Table 1).

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