Exploitation of the hard/soft segments ratio in thermoplastic polyurethane (TPU) for the tuning of electrical and mechanical properties of expanded graphite (EG) based composites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F19%3A00507000" target="_blank" >RIV/61389013:_____/19:00507000 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/content/pdf/10.1007%2Fs42452-019-0908-3.pdf" target="_blank" >https://link.springer.com/content/pdf/10.1007%2Fs42452-019-0908-3.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s42452-019-0908-3" target="_blank" >10.1007/s42452-019-0908-3</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Exploitation of the hard/soft segments ratio in thermoplastic polyurethane (TPU) for the tuning of electrical and mechanical properties of expanded graphite (EG) based composites

Popis výsledku v původním jazyce

Composite materials based on three kinds of commercial thermoplastic polyurethanes (TPUs) and electrically conductive expanded graphite (EG) were prepared by melt-mixing. The TPUs differed mainly in hard/soft segment ratio, resulting in different polarity and crystallinity. These parameters were exploited to prepare composite materials with different percolating path structure, whose characteristics were thoroughly analysed. Test specimens were prepared by compression moulding and their electrical, thermal and mechanical properties, as dependent on filler content, were analysed. The electrical behaviour was correlated to the morphologies. The results showed how EG promoted and modified the crystallization, resulting in enhanced hardness but reduced toughness of the material. Moreover, EG segregation was observed in the TPU with the highest HS content which already promoted percolating paths at EG concentration below 2 wt% (1.1 vol%) and showed a resistivity between 105 and 104 Ω cm, while in TPU with low crystallinity the percolation was shifted to above 4 wt% EG and the resistivity reached values slightly over 105 Ω cm at 8 and 10 wt% EG. These peculiarities enabled easy management of a broad range of industrial application such as antistatic coatings, mechanically reinforced insulators, and electrical conductive connectors using a few pristine materials.

Název v anglickém jazyce

Exploitation of the hard/soft segments ratio in thermoplastic polyurethane (TPU) for the tuning of electrical and mechanical properties of expanded graphite (EG) based composites

Popis výsledku anglicky

Composite materials based on three kinds of commercial thermoplastic polyurethanes (TPUs) and electrically conductive expanded graphite (EG) were prepared by melt-mixing. The TPUs differed mainly in hard/soft segment ratio, resulting in different polarity and crystallinity. These parameters were exploited to prepare composite materials with different percolating path structure, whose characteristics were thoroughly analysed. Test specimens were prepared by compression moulding and their electrical, thermal and mechanical properties, as dependent on filler content, were analysed. The electrical behaviour was correlated to the morphologies. The results showed how EG promoted and modified the crystallization, resulting in enhanced hardness but reduced toughness of the material. Moreover, EG segregation was observed in the TPU with the highest HS content which already promoted percolating paths at EG concentration below 2 wt% (1.1 vol%) and showed a resistivity between 105 and 104 Ω cm, while in TPU with low crystallinity the percolation was shifted to above 4 wt% EG and the resistivity reached values slightly over 105 Ω cm at 8 and 10 wt% EG. These peculiarities enabled easy management of a broad range of industrial application such as antistatic coatings, mechanically reinforced insulators, and electrical conductive connectors using a few pristine materials.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

<a href="/cs/project/TE01020022" target="_blank" >TE01020022: Flexibilní tištěná mikroelektronika s využitím organických a hybridních materiálů, FLEXPRINT</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

SN Applied Sciences

ISSN

2523-3963

e-ISSN

—

Svazek periodika

1

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

878

Kód UT WoS článku

000476622600002

EID výsledku v databázi Scopus

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