Reduced percolation concentration in polypropylene/expanded graphite composites: effect of viscosity and polypyrrole

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F15%3A00441927" target="_blank" >RIV/61389013:_____/15:00441927 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1002/APP.41994" target="_blank" >http://dx.doi.org/10.1002/APP.41994</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/APP.41994" target="_blank" >10.1002/APP.41994</a>

Result language

angličtina

Original language name

Reduced percolation concentration in polypropylene/expanded graphite composites: effect of viscosity and polypyrrole

Original language description

With the goal to obtain material combining electrical and thermal conductivity at low filler loadings, composites based on polypropylenes (PP) and expanded graphite (EG) have been prepared. The effects of matrix viscosity and of coating the EG particleswith polypyrrole (PPy, EG/PPy?=?37.5/62.5 by weight) on the EG dispersibility and formation of percolation structures have been analyzed. When increasing the EG amount from 6 to 8 wt %, the electrical conductivity of PP/EG composites increased by 7?9 orders of magnitude, independent of matrix viscosity. When EG-PPy is added, percolation was observed between 8 and 12 wt % EG-PPy (3 and 4.5 wt % EG) in case of PP with higher viscosity and 6 wt % EG (2.25 wt % EG) in case of PP with lower viscosity, exhibiting a strong synergistic effect of EG and PPy in the latter case. In contrast, PPy does not contribute to reduction of thermal percolation concentration. Thermal percolation is observed at 8 wt % EG in PP/EG composites, but no percolatio

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CD - Macromolecular chemistry

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

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

Name of the periodical

Journal of Applied Polymer Science

ISSN

0021-8995

e-ISSN

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Volume of the periodical

132

Issue of the periodical within the volume

20

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

"41994_1"-"41994_12"

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-84923572761