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ZBONČÁK, M. ONDREÁŠ, F. UHLÍŘ, V. LEPCIO, P. MICHALIČKA, J. JANČÁŘ, J.
Original Title
Translation of segment scale stiffening into macro scale reinforcement in polymer nanocomposites
Type
journal article in Web of Science
Language
English
Original Abstract
Structuring of polymer nanocomposites (PNCs) with an aid of relatively weak external magnetic fields has been studied as a method for control of the nano- and microstructure. Magnetic nanoparticles (NPs) were assembled into high aspect ratio one-dimensional strings and unidirectionally oriented with magnetic field (B=0-50 mT) within the photopolymer matrix. The effect of the anisotropic MNPs assemblies on the mechanical properties was studied over wide temperature range for the first time. Impact of various reinforcing mechanisms was distinguished with respect to the position of the glass transition temperature (Tg). The reinforcing effect exhibits temperature dependency with a maximum ~65°C above the glass transition and only negligible effect below the Tg. In addition, significant directional anisotropy of stiffness was observed. Composites micromechanics was applied to interpret the orientation and size dependent reinforcement of PNCs and temperature dependent stiffness of the polymer-MNPs structures was quantified. The presence of polymer chains with altered dynamics surrounding the MNPs inside the anisotropic assemblies was proposed to be essential nano-scale mechanism mediating the stress transfer and contributing to mechanical robustness of the hybrid structures and PNCs.
Keywords
self-assembly; nanocomposites; structure-property relationships
Authors
ZBONČÁK, M.; ONDREÁŠ, F.; UHLÍŘ, V.; LEPCIO, P.; MICHALIČKA, J.; JANČÁŘ, J.
Released
2. 3. 2020
Publisher
Wiley
ISBN
0032-3888
Periodical
Polymer Engineering and Science
Year of study
60
Number
3
State
United States of America
Pages from
587
Pages to
596
Pages count
10
URL
https://onlinelibrary.wiley.com/doi/abs/10.1002/pen.25317
BibTex
@article{BUT160845, author="Marek {Zbončák} and František {Ondreáš} and Vojtěch {Uhlíř} and Petr {Lepcio} and Jan {Michalička} and Josef {Jančář}", title="Translation of segment scale stiffening into macro scale reinforcement in polymer nanocomposites", journal="Polymer Engineering and Science", year="2020", volume="60", number="3", pages="587--596", doi="10.1002/pen.25317", issn="0032-3888", url="https://onlinelibrary.wiley.com/doi/abs/10.1002/pen.25317" }