"http://www.isvav.cz/projectDetail.do?rowId=IAA200600703"^^ . . "25"^^ . "2011-12-31+01:00"^^ . . . "25"^^ . . . . " metallocene-based polymers" . "Investigation of flow behaviour for a novel class of metallocene-based polymers"@en . . " viscosity" . . . . "At the 90s' new metallocene catalysts enabled synthesis of polymers exhibiting narrow molecular weight distribution and very well controlled molecular architecture and molecular weight. In spite of much better product qualities of these polymers in comparison with the conventional ones their wider usage is significantly limited due to poor processability in the standard technologies. Recent publications indicate a possibility of elimination of this shortage by controlled implementation of the long chain branches on the main chain or by presence of high molecular weight component fraction in the polymer (bimodal molecular weight distribution). This project aims at revealing a relationship between molecular architecture of these polymers and their rheological flow behaviour. Attention also will be paid to the development of new experimental techniques for determination of the extensional viscosity and melt strength with respect to their specific behaviour in the melting temperature area."@en . "1"^^ . . . "2011-03-18+01:00"^^ . "rheology" . "2007-01-01+01:00"^^ . "2013-06-28+02:00"^^ . . "0"^^ . . . . "2"^^ . "Na proveden\u00FDch reologick\u00FDch m\u011B\u0159en\u00EDch vybran\u00FDch metaloc\u00E9nov\u00FDch materi\u00E1l\u016F byly testov\u00E1ny molekul\u00E1rn\u011B zalo\u017Een\u00E9 diferenci\u00E1ln\u00ED a integr\u00E1ln\u00ED modely s c\u00EDlem uk\u00E1z\u00E1n\u00ED p\u0159ednost\u00ED a nedostatk\u016F t\u011Bchto model\u016F pro popis chov\u00E1n\u00ED jednotliv\u00FDch reologick\u00FDch charakteristik."@cs . "Based on detailed rheological measurements of selected metallocene materials there were applied molecular-based constitutive models with the aim to emphasize their advantages and shortcomings for a description of individual rheological characteristics."@en . . "V\u00FDzkum tokov\u00E9ho chov\u00E1n\u00ED nov\u00E9 t\u0159\u00EDdy metalocenov\u00FDch polymer\u016F" . "IAA200600703" . "Nov\u00E9 metalocenov\u00E9 katalyz\u00E1tory umo\u017Enily po\u010D\u00E1tkem 90.let synt\u00E9zu polymer\u016F charakterizovan\u00FDch velmi \u00FAzkou distribuc\u00ED molekulov\u00FDch hmotnost\u00ED,kontrolovanou molekul\u00E1rn\u00ED architekturou a molekulovou hmotnost\u00ED. I kdy\u017E u\u017Eitn\u00E9 vlastnosti t\u011Bchto polymer\u016F v\u00FDrazn\u011B p\u0159evy\u0161uj\u00ED konven\u010Dn\u00ED polymery,jejich masov\u011Bj\u0161\u00EDmu vyu\u017Eit\u00ED br\u00E1n\u00ED obt\u00ED\u017En\u00E1 zpracovatelnost standardn\u00EDmi technologiemi. Ned\u00E1vno publikovan\u00E9 pr\u00E1ce nazna\u010Duj\u00ED,\u017Ee kontrolovan\u00E9 zav\u00E1d\u011Bn\u00ED v\u011Btv\u00ED na z\u00E1kladn\u00ED \u0159et\u011Bzec polymeru nebo p\u0159\u00EDtomnost mal\u00E9ho mno\u017Estv\u00ED vysokomolekul\u00E1rn\u00EDho pod\u00EDlu (bimod\u00E1ln\u00ED charakter distribuce molekulov\u00FDch hmotnost\u00ED) v\u00FDrazn\u011B p\u0159isp\u00EDv\u00E1 k jejich zpracovatelnosti. C\u00EDlem tohoto projektu je odhalen\u00ED vztahu mezi molekul\u00E1rn\u00ED architekturou t\u011Bchto polymer\u016F a jejich reologick\u00FDm chov\u00E1n\u00EDm ve smykov\u00FDch a elonga\u010Dn\u00EDch toc\u00EDch,kter\u00E9 se vyskytuj\u00ED p\u0159i zpracov\u00E1n\u00ED. D\u016Fraz bude kladen na v\u00FDvoj experiment\u00E1ln\u00EDch technik pro stanoven\u00ED elonga\u010Dn\u00ED viskozity a pevnosti taveniny t\u011Bchto materi\u00E1l\u016F,a to s ohledem na jejich specifick\u00E9 chov\u00E1n\u00ED v oblasti teploty te\u010Den\u00ED." . . "rheology; viscosity; metallocene-based polymers; viscoelasticity"@en .