Počet záznamů: 1

Nucleation of polypropylene with gold nanoparticles. Part 1: Introduction of sandwich method for evaluation of very weak nucleation activity

  1. 1.
    0342351 - UMCH-V 2011 RIV US eng J - Článek v odborném periodiku
    Pavlova, Ewa - Šlouf, Miroslav - Šandová, Hana - Baldrian, Josef - Sikora, Antonín - Lednický, František - Masirek, R. - Piorkowska, E.
    Nucleation of polypropylene with gold nanoparticles. Part 1: Introduction of sandwich method for evaluation of very weak nucleation activity.
    Journal of Macromolecular Science - Physics. Roč. 49, č. 2 (2010), s. 392-404 ISSN 0022-2348
    Grant CEP: GA AV ČR KAN200520704
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: gold nanoparticles * isotactic polypropylene nucleation * transcrystallization
    Kód oboru RIV: EB - Genetika a molekulární biologie
    Impakt faktor: 0.602, rok: 2010

    Although gold particles are known to nucleate isotactic polypropylene (PP), the nucleating effect of chemically pure 5 nm Au, prepared in vacuum sputter coater, was found to be hardly observable. In order to detect such a weak effect, we deposited a homogeneous layer of Au nanoparticles between thin PP films and evaluated the nucleation activity by a combination of three independent methods: polarized light microscopy (PLM), differential scanning calorimetry (DSC), and 2D wide-angle X-ray scattering (2D-WAXS). This new technique, which was called sandwich method, allowed us to demonstrate that gold nanoparticles were able to nucleate PP crystallization, although the effect was much weaker than that produced by commercial .alpha.-nucleant [1,2,3,4-bis(3,4-dimethylbenzylidene)sorbitol] and .beta.-nucleant (N,N-Dicyclohexyl-2,6-naphthalene dicarboxamide). The sandwich method appeared to be quite universal and applicable for any micro-sized nucleants or nanonucleants.
    Trvalý link: http://hdl.handle.net/11104/0185104