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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU134543" target="_blank" >RIV/00216305:26620/20:PU134543 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/abs/10.1002/pen.25317" target="_blank" >https://onlinelibrary.wiley.com/doi/abs/10.1002/pen.25317</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/pen.25317" target="_blank" >10.1002/pen.25317</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10404 - Polymer science

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Polymer Engineering and Science

ISSN

0032-3888

e-ISSN

1548-2634

Svazek periodika

60

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

587-596

Kód UT WoS článku

000504519200001

EID výsledku v databázi Scopus

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