Electromagnetic shielding of polypyrrole-sawdust composites: polypyrrole globules and nanotubes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00476207" target="_blank" >RIV/61389013:_____/17:00476207 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/70883521:28610/17:63516629

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10570-017-1357-z" target="_blank" >http://dx.doi.org/10.1007/s10570-017-1357-z</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10570-017-1357-z" target="_blank" >10.1007/s10570-017-1357-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electromagnetic shielding of polypyrrole-sawdust composites: polypyrrole globules and nanotubes

Popis výsledku v původním jazyce

Economic and efficient materials for the shielding of electromagnetic interference are required by many applications. Electrically conducting composite materials based on wood sawdust modified by polypyrrole (PPy) with different morphology, globular and nanotubular, were prepared through in-situ polymerization of pyrrole with the use of iron (III) chloride as an oxidant. The effect of PPy morphology and content in composite with sawdust on the DC conductivity and shielding effectiveness (SE) were investigated. Composites of sawdust with globular PPy demonstrated higher DC conductivity as compared to those with PPy nanotubes as long as PPy content was less or equal to 18 vol.%. Above this concentration the opposite trend was observed. The SE of composites was evaluated theoretically in the radio-frequency range, and measured by waveguide method in the frequency range 5.85-8.2 GHz. The SE increased with increase in DC conductivity, and good agreement between the theoretically calculated SE and experimental results was achieved. The SE of the composites extended over 20 dB level above 18 vol.% PPy at the thickness of the order of 10 µm. Polypyrrole nanotubes perfomed better than globular PPy at high conducting polymer content. The composites are good candidates for the application as shielding materials in the microwave band.

Název v anglickém jazyce

Electromagnetic shielding of polypyrrole-sawdust composites: polypyrrole globules and nanotubes

Popis výsledku anglicky

Economic and efficient materials for the shielding of electromagnetic interference are required by many applications. Electrically conducting composite materials based on wood sawdust modified by polypyrrole (PPy) with different morphology, globular and nanotubular, were prepared through in-situ polymerization of pyrrole with the use of iron (III) chloride as an oxidant. The effect of PPy morphology and content in composite with sawdust on the DC conductivity and shielding effectiveness (SE) were investigated. Composites of sawdust with globular PPy demonstrated higher DC conductivity as compared to those with PPy nanotubes as long as PPy content was less or equal to 18 vol.%. Above this concentration the opposite trend was observed. The SE of composites was evaluated theoretically in the radio-frequency range, and measured by waveguide method in the frequency range 5.85-8.2 GHz. The SE increased with increase in DC conductivity, and good agreement between the theoretically calculated SE and experimental results was achieved. The SE of the composites extended over 20 dB level above 18 vol.% PPy at the thickness of the order of 10 µm. Polypyrrole nanotubes perfomed better than globular PPy at high conducting polymer content. The composites are good candidates for the application as shielding materials in the microwave band.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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

2017

Kód důvěrnosti údajů

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

Název periodika

Cellulose

ISSN

0969-0239

e-ISSN

—

Svazek periodika

24

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

3445-3451

Kód UT WoS článku

000405612000028

EID výsledku v databázi Scopus

2-s2.0-85020755480