Detail publikačního výsledku

Translation of segment scale stiffening into macro scale reinforcement in polymer nanocomposites

ZBONČÁK, M.; ONDREÁŠ, F.; UHLÍŘ, V.; LEPCIO, P.; MICHALIČKA, J.; JANČÁŘ, J.

Originální název

Translation of segment scale stiffening into macro scale reinforcement in polymer nanocomposites

Anglický název

Translation of segment scale stiffening into macro scale reinforcement in polymer nanocomposites

Druh

Článek WoS

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

self-assembly; nanocomposites; structure-property relationships

Klíčová slova v angličtině

self-assembly; nanocomposites; structure-property relationships

Autoři

ZBONČÁK, M.; ONDREÁŠ, F.; UHLÍŘ, V.; LEPCIO, P.; MICHALIČKA, J.; JANČÁŘ, J.

Rok RIV

2021

Vydáno

02.03.2020

Nakladatel

Wiley

ISSN

0032-3888

Periodikum

POLYMER ENGINEERING AND SCIENCE

Svazek

60

Číslo

3

Stát

Spojené státy americké

Strany od

587

Strany do

596

Strany počet

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"
}