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Electrical properties of modified‐grafted polypropylene
Author(s) -
ElSawy Naeem M.,
Khalil Magda M. I.,
ElShobaky Gamil A.
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25956
Subject(s) - grafting , polypropylene , materials science , yield (engineering) , substrate (aquarium) , chemical engineering , polymer chemistry , sulfur , polymer , composite material , oceanography , engineering , metallurgy , geology
The electrical properties of polypropylene (PP), grafted polypropylene (PP‐ g ‐PVP), and modified‐grafted PVP with α‐cyano‐β‐(2‐thienyl) crotononitrile were investigated. Also, the electrical characteristic of the modified‐grafted PVP subjected to γ‐irradiation (60 kGy) was studied. The results show that the σ of trunk polymer undergoing different degree of grafting generally increases as function of the grafting yield. The grafting yield between 64.1 and 149% resulted in a progressive decrease in Δ E σ value. Inclusion of sulfur‐containing substrate in different films, having various grafting yields, leads to both increase and decrease in σ values. A significant increase in σ values is observed upon inclusion of sulfur‐containing substrate having maximum grafting yield (149%). These changes are accompanied by fluctuation in σ values. The exposure of sulfur‐containing substrate in grafting film to a dose of 60 kGy results in a significant decrease in Δ E σ values for the films undergoing a grafting yield between 64.1 and 149%. The observed changes in Δ E σ of different films investigated could be attributed mainly to corresponding changes in σ ′ 0values. The observed improvement in electrical properties is mainly because of possible increase in concentration of charge carrier and/or their mobilities. The scanning electron micrographs of some selected films show significant changes in the morphology of the films investigated due to changing the grafting yield, inclusion of sulfur‐containing substrate, and exposure to γ‐irradiation. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3797–3803, 2007