National Repository of Grey Literature 33 records found  beginprevious33 - 33  jump to record: Search took 0.01 seconds. 
The influence of molecular weight of polypropylene on isothermal crystallization of nanocomposites
Krajčik, Ladislav ; Poláček, Petr (referee) ; Bálková, Radka (advisor)
This work deals with the study of the influence of metallocene type polypropylene (mPP) molecular weight on isothermal crystallization of its nanocomposites filled with hydrophobic and hydrophilic nanosilica (1 and 2 vol.%). Real amount of nanosilica was determined by thermogravimetry. Isothermal crystallization was performed on differential scanning calorimeter (DSC) at 119–125 °C and observed in-situ under optical polarizing microscope (POM) at 128 °C using hot stage. The increase of mPP crystallinity degree in time was determined on DSC and spherulite type and growth rate was determined using POM. Supramolecular surface structure of the original and isothermally crystallited nanocomposites was observed directly or after chemical etching (mixture of mineral acids with KMnO4) on confocal laser scanning microscope. The crystal structure of mPP was in all tested materials verified by X-ray diffraction.

National Repository of Grey Literature : 33 records found   beginprevious33 - 33  jump to record:
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