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By James C. W. Chien

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7 Polyacetylene 23 There are very basic differences between the eis and trans forms of polyacetylene. It is through careful investigations of these differences that novel physics emerges. The trans polymer is endowed with highly mobile spins, which will be referred to as neutral solitons; it is photoconducting and does not show band edge luminescence. On the other hand, ds-polyacetylene shows nearly the opposite properties; the unpaired spins are delocalized but not diffusive. It is nonphotoconducting and emits band-edge luminescence characteristic of electron-hole recombination.

5 Preparation of Free-Standing cts-Polyacetylene Film The reactor containing the aged catalyst solution was evacuated with gentle shaking for 30-90 min at 195 K. The catalyst solution became progressively more viscous. The reactor was briefly removed from the dry ice-acetone bath and shaken to wet as much of the reactor walls with the catalyst solution as possible. It was then immediately placed back into the 195-K bath, and stopcock C was opened, allowing acetylene to enter. 2 Polymerization of Acetylene Catalyzed by Ti{OBu)4-AlEt3 33 film increased.

Whenever rubber tubing is required because of itsflexibility,those made of butyl rubber (used for the inner tubes of tires) are preferred. In particular, tygon tubings made of plasticized poly(vinyl chloride) should be avoided because of its high oxygen permeability and the volatile plasticizer it contains, both of which are deleterious to the catalyst and to the polyacetylene 28 2 Polymerization as well. ) greaseless Teflon stopcocks should be employed, and Viton O-ring seals are preferred over standard-tapered joints.

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