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Morphology, resistivity, and thermal behavior of EVOH/carbon black and EVOH/graphite composites prepared by simple saponification method
Author(s) -
Lee EunJu,
Yoon JinSan,
Park EunSoo
Publication year - 2011
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.21090
Subject(s) - saponification , materials science , composite material , differential scanning calorimetry , carbon black , electrical resistivity and conductivity , graphite , ultimate tensile strength , ethylene vinyl acetate , copolymer , polymer , organic chemistry , natural rubber , chemistry , physics , electrical engineering , thermodynamics , engineering
Poly(ethylene‐ co ‐vinyl alcohol) (EVOH)/carbon black (CB) and EVOH/graphite (GP) electro‐conductive composites were prepared by saponification of poly(ethylene‐ co ‐vinyl acetate) (EVA)/CB and EVA/GP composites in ethanol/KOH solution. The electrical resistivity change and positive temperature coefficient (PTC) behavior of these composites were investigated. The volume resistivity of EVA/CB and EVA/GP composites was decreased with saponification time. It can be observed that EVA/CB10 and EVA/GP05 composites showed a significant reduction in resistivity after saponification for 1 h. With the increase in saponification time, PTC peak temperature of both composites was shifted at a higher temperature. Tensile properties, morphology, and thermal behavior of the prepared composites have been also evaluated using universal test machine, scanning electron microscopy, and differential scanning calorimetry, respectively. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers