National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
Strain field reconstruction of drawn polymer blends based on videorecording of stretching process
Převorovský, Zdeněk ; Krofta, Josef ; Blaháček, Michal ; Raab, Miroslav
Tensile tests of polypropylene and its blends with polyethylene and other additives have been recorded by digital camcorder. Acoustic emission (AE) was monitored during tests by two transducers attached to test samples, allowing linear location of AE**ces. Tested materials exhibit large localized plastic deformation - necking - reaching hundreds of percent before failure. Image analysis procedure is designed for quantitative evaluation of axial and lateral strains and strain rates along the sample
Acoustic emission during necking and plastic elongation of semi-crystalline polymer blends
Převorovský, Zdeněk ; Krofta, Josef ; Blaháček, Michal ; Raab, M.
Tensile tests of polypropylene and its blends with polyethylene and other additives have been recorded by digital camcorder. Acoustic emission (AE) was monitored during tests by two transducers attached to test samples, allowing linear location of AE**ces. Tested materials exhibit large localized plastic deformation - necking - reaching hundreds of percent before failure. Image analysis procedure is designed for quantitative evaluation of axial and lateral strains and strain rates along the sample
The effect of compatibilizers on morphology and mechanical behaviour of polyetylene/polypropylene blends
Raab, Miroslav ; Ščudla, Jaroslav ; Baldrian, Josef ; Nezbedová, E.
Two ethylene-propylene copolymers differing in ethylene content and crystallinity were used as compatibilizers in blends of high-density polyethylene and isotactic polypropylene. The results suggest that the amorphous compatibilizer is superior to the other copolymer. It forms an interphase between the polyethylene and polypropylene domains thus improving the interfacial adhesion and material toughness.
Polymeric materials and man
Raab, Miroslav
This invited introductory lecture concerns the historical perspective of polymeric materials. The role of individualpersonalities and also serendipity in scientific and technological discoveries is discussed. It is shown that the present marked development of commodity polymers is connected with their favourable price/performance ratio.

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