Titlebook: Relationship of Polymeric Structure and Properties; I. Chudáček Conference proceedings 1988 Springer-Verlag Berlin Heidelberg 1988 polymer

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Charging and charge-detection methods and their use in the characterization of polymer-electret matof the respective sample material. Surface charging with electron beams of relatively low energies may be used to achieve positive charging and to determine the secondary-electron emission yield of the specimen. Laser-induced pressure pulses permit the scanning of charge and polarization profiles as

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Dielectric relaxation processes in poly (epoxypropylcarbazole) layers,he conclusion that near .. the observed relaxations are essentially associated with the cooperative nature of the carbazole units motions without the direct influence of the polymeric chain. The experimental data fit the nonexponential correlation function better than the functions obtained from the distribution of relaxation time concept.

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Modified epoxies as studied by ultrasonic methods,tion of the epoxy systems was varied in a systematic manner and its influence on the ultrasonic properties was studied. The results show that ultrasonic methods serve as a useful tool for the characterization of curing reactions and highly crosslinked networks.

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ESR on polymer semiconductors of poly(tetrathiafulvalene),spin concentration in the doped speciality polymers is about 10. spins per gram. The conductivity of the variously doped samples lies in the area of 10. to 10. Scm. at room temperature and increases with temperature, as is typical for semiconductors.

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Charging and charge-detection methods and their use in the characterization of polymer-electret matuding electron-beam charging which leads to polarization zones of predetermined thickness inside the samples; poling-current measurements can be utilized to estimate the ferroelectric polarization in the samples and to model the feroelectric-switching behavior of the dipoles.

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Dielectric and thermal relaxations in amorphous and semicrystalline poly(ethylene terephthalate),e structure, as shown by the correlation between the size of the cooperative, rearranging regions and the thickness of the layer of mobile amorphous material..The WLF-curves are shown for the amorphous and the semicrystalline PET in the frequency range from 10. to 10. Hz. A deviation from these curves, expected for the hindrance, is not observed.

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Description of the freezing-in process in poly(vinyl acetate) based on the meander model,ons, that the product of cooling rate and relaxation time is about 15 K at ... The relation between the dielectric and the thermodynamic relaxation times are investigated and it is found that they are equal within an uncertainty factor of approximately 2. Mechanical measurements are also presented.

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The relaxation of additives in polymer matrix,nt of additives in these materials..The behavior of IR 305 with acetonitrile is more complicated. The main transition region is enlarged by the acetonitrile and we can observe its plasticizing effect in this region. The movement of free acetonitrile molecules in IR 305 appears at relatively high amounts of acetonitrile.