Acene/polymer system

In this contribution, in order to illustrate tlie importance of shake-up bands for extended systems, we simulate and compare on correlated grounds the ionization spectra of polyethylene and poly acetylene, the most simplest systems one can consider to represent insulating or semi-conducting polymers. Conclusions for the infinite stereoregular chains are drawn by exU apolation of the trends observed with the first terms of the related n-alkane or acene series, CnH2n+2 and CnHn+2. respectively, with n=2, 4, 6 and 8. Our simulations are also compared to X-ray photoionization spectra (7) recorded on gas phase samples of ethylene, butadiene and hexatriene, which provide a clear experimental manisfestation of the construction of correlation bands (8-12). 

Figure 2 Planar 7r-systems of representative conjugated molecules and polymers, and cr-conjugated polysilanes. Polyenes, acenes and rylenes have variable length. Polydiacetylenes, polythiophenes, polyparaphenylenevinylenes and polysilanes give families with similar backbones and different nonconjugated side groups.

Particle conductivity has a strong influence on ER performance. Block [24J studied how ER effect is influenced by the particle conductivity using the acene-quinone radical polymer/silicone oil, and found that the static yield stress peaks at a particle conductivity around 10 S/m (sec Figure 17). The molecular structure of the acene-quinone radical polymers is shown in Figure 18 and Figure 3 in Chapter 3. A similar tendency was found in oxidized polyacrylonitrile/silicone oil ER system [61J. However, the yield Stress peaks at the particle conductivity of about 10 S/m, rather than 10 ... 

The concept of poling essentially induces polar order through the application of an electric field. In polymeric systems, the chromophores are dispersed in a polymer matrix, and dipolar orientation of chromophores are reoriented and acen-trically aligned by a strong electric field at a temperature above... 

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