Poly electron interaction volume

Fig. 2.5 The electron interaction volume in poly(methyl methacrylate) for 20 kV electrons is shown directly by etching away irradiated material. The incident electron dose is the same in (A-G), but the etching time is increased, so the material irradiated less is removed [31].

The interaction volume of 20 kV electrons in poly(methyl methacrylate) (PMMA) has been shown directly by using its radiation sensitivity [39]. After exposure to a beam of electrons, the material was cross sectioned, polished, and etched. Pear-shaped holes up to 10/rm deep appear (Fig. 2.5) showing where the beam interacted with the PMMA (and reduced its molecular weight) [39]. Calculation of the interaction... 

Physico-chemical properties of the microdomain of polymer complexes have been studied by means of Ih-NMR I, light scattering , or fluorescence polarization. Here, the authors tried to evtiluate the microdomain of polymer complexes by the electrochemical cissay. The formation of polyion complex affected the redox behavior of poly-(viologen)s considerably. Fig. 1 shows the cyclic voltammograms for PXV-PSS complex coated electrode. The first redox peak shifted to positive side, and peak broadening was observed by the complex formation. It is clear that the redox behavior was restricted by the complexation. It is known that the electron transfer process must accompany the migration of counter ions to maintain electroneutrality. As in polymer complex microdomain, polyelectrolyte chains interacted with each other and decreased their free volume, they should thereby provide the domain with smaller porosity. 

Unlike unsubstituted polyacetylene, its silicon derivatives are air stable and highly soluble [143]. Since the discovery of poly[l-(trimethylsilyl)-l-propene] [144], silicon-substituted polyacetylenes are well-known for their extremely high gas permeation properties caused by a large free volume in the polymer films [145, 146]. However, organosilicon substituents, directly attached to a polyacetylene backbone, weaken the interchain interactions, which might cause inferior electrical properties. This can be a reason for the little work reported on the application of this type of polymers in organic electronics and photonics. 

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