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Dielectric properties of lithium‐perchlorate‐filled acrylonitrile–hexyl methacrylate copolymer films
Author(s) -
Cicek Meryem,
Vargun Elif,
Abaci Ufuk,
Guney H. Yuksel
Publication year - 2017
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.23749
Subject(s) - copolymer , materials science , thermogravimetric analysis , glass transition , acrylonitrile , polymer chemistry , methacrylate , differential scanning calorimetry , conductivity , lithium perchlorate , dielectric , thermal stability , ionic conductivity , dielectric loss , chemical engineering , composite material , polymer , electrolyte , chemistry , physics , optoelectronics , electrode , engineering , thermodynamics
A series of poly(acrylonitrile‐co‐hexyl methacrylate), PAN‐co‐PHMA, copolymers with various hexyl methacrylate (HMA) contents were synthesized by emulsion technique. The incorporation of HMA units into the copolymers was confirmed by Fourier transform infrared and proton nuclear magnetic resonance ( 1 H‐NMR) spectroscopy. Glass transition temperatures ( T g ) and thermal decomposition temperatures of copolymers were determined by differential scanning calorimetry and thermogravimetric analysis. The T g of copolymers were lowered monotonically by increasing HMA content, while thermal stabilities of copolymers were enhanced. The frequency dependence of dielectric properties of three different amounts of LiClO 4 salt doped copolymer films was investigated. The influence of molar fraction of HMA on dielectric constant and ac‐conductivity of copolymer films was examined. Samples with higher HMA contents showed better stability and conductivity, as a result of increase in free volume and the mobility of the dipoles. The ac conductivity of copolymers was also improved by increasing LiClO 4 salt which was due to the existence of more charge carriers. PAN(88)‐co‐PHMA(12) copolymer with 1.5 mol% of lithium salt exhibited ionic conductivity of the 7.8 × 10 −4 S/cm at 298 K. POLYM. COMPOS., 38:1792–1799, 2017. © 2015 Society of Plastics Engineers