Project detail

Effect of nanoparticles on the chain mobility and crystalization kinetics in polyolefin nanocomposites

Duration: 01.01.2010 — 31.12.2012

Funding resources

Czech Science Foundation - Standardní projekty

- whole funder (2010-01-01 - 2012-12-31)

On the project

Description in English
The nanoparticles change both static conformational structure and lengthen the chain reptation time considerably. Model based on the reptation dynamics, proposed by the PI, is capable to predict effects of structural variables on spherulite growth rate in the presence of solid nanoparticles. It is proposed to investigate effects of adding nanoparticles on the morphogenesis of spherulitic structure and deformation response of nanocomposites with PP and PE matrices of different molecular architecture. Morphology of nanocomposites will be investigated utilizing optical and electron microscopy, differential scanning calorimetry, x-ray diffraction, hot stage and measurements of density. Mechanical behavior will be explored using dynamic-mechanical thermal spectroscopy, static tensile testing and microdeformation mechanisms will be investigated employing newly designed microtensile tester operating in the viewing field of the Confocal Laser Microscope. MD/MC simulations will be employed to determine if theretardation of the reptation dynamics is due to the chain immobilization or chain topological confinement or increased chain structural frustration in the vicinity of the nanoparticle surface. Also, the nature of entanglements will be clarified, comparing the model of entanglement as the topological constraint with the dynamic fragility approach based on dynamically rearranging chain cluster.

Mark

GAP205/10/2259

Default language

Czech

People responsible

Jančář Josef, prof. RNDr., CSc. - principal person responsible

Units

Faculty of Chemistry
- beneficiary (2010-01-05 - not assigned)

Results

SVĚRÁK, T. Aktivátory mletí používané v průmyslu cementu. In V. odborný seminář Kvalita cementu 2011. Brno: VÚSTAH, 2011. s. 51-60. ISBN: 978-80-87397-04-6.
Detail

BÁLKOVÁ, R.; JANČÁŘ, J.; SADÍLEK, J. Deformační morfologie strukturně odlišného iPP pozorovaná pod CLSM in situ. Strojírenská technologie, 2010, roč. 15, č. 4, s. 8-12. ISSN: 1211-4162.
Detail

JANČÁŘ, J.; BÁLKOVÁ, R. On the differences in micro-deformation mechanism between isotactic polypropylene and b-nucleated iPP as revealed by the confocal laser scanning microscopy. Polymer Engineering and Science, 2011, vol. 51, no. 9, p. 2434-2438. ISSN: 0032-3888.
Detail

JANČÁŘ, J.; TOCHÁČEK, J. Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers. Macromolecular symposia, 2013, vol. 330, no. 1, p. 166-176. ISSN: 1521-3900.
Detail

SVĚRÁK, T.; DOHNAL, M.; BULEJKO, P.; SCHWARZEROVÁ, L. Efektivní využití údajů o jemně mletém uhlí fuzzy metodou. In Kvalita cementu 2012, VÚSTAH, Výzkumný ústav stavebních hmot. Brno: VÚSTAH a.s., 2012. s. 61-72. ISBN: 978-80-87397-10-7.
Detail

JANČÁŘ, J.; BÁLKOVÁ, R. Effect of Interfacial Interactions on the Crystal Growth Rate in Model PE/SiO2 Nanocomposites: Comparing Experiments With Lauritzen-Hoffman Model and MD Simulation. Polymer Engineering and Science, 2013, vol. 53, no. 12, p. 2696-2704. ISSN: 0032-3888.
Detail

JANČÁŘ, J.; FIORE, K. Molecular weight scaling of the spherulite growth rate in isothermally melt crystallized polyethylene nanocomposites. Polymer, 2011, vol. 52, no. 10, p. 5851-5857. ISSN: 0032-3861.
Detail

Responsibility: Jančář Josef, prof. RNDr., CSc.