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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Modifikace izotaktického polypropylenu
 Ličko, M. ; Jeníková, Z. ; Rybníček, J. ; Horník, J. ; Steidl, J. ; Raab, Miroslav
Injection moulded samples of polypropylene were used to study the effect of trigonal .beta.-phase and ethylene propylene rubber on mechanical-physical properties in respect to microstructure. The results were compared with pure isotactic polypropylene, .beta.phase induced by 0.33 weight percent of a nucleation reagent and 20 weight percent of EPM rubber increases the toughness of iPP. A substantial increase in toughness was observed by combining both additives resulting in spherolite refinement and reduction in amorphous content. However, the improvement in toughness was at the expense of the yield strength and modulus of elasticity.
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Sensorické vlastnosti rozpustných ftalocyaninů
 Severová, K. ; Weiter, M. ; Nešpůrek, Stanislav
Soluble phthalocyanine is suitable material for the preparation of humidity sensors. Thin films can be prepared from solution by casting or spin coating. Optical spectrum shows two main maxima located at 350 nm and 680 nm. Two additional weak bands with maxima located at 610 and 640 nm result from V vibrations and dimer formation, respectively.
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Optické a elektrické přepínání v organických polovodičích
 Vala, M. ; Weiter, M. ; Nešpůrek, Stanislav ; Zmeškal, O.
The work deals with tuning of electro-optical properties of polymeric media using reversible light-driven switching of photochromic spiropyran guest molecules. The significant change of dipole moment during the photochromic conversion allows construction of simple switching units. Optical responses of such devices were studied using absorbance and photoluminescence, electrical responses, were detected by impedance measurements.
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