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Abstract

This study investigated the influence of plasticizers (polyethylene glycol [PEG] and ethylene carbonate [EC]) on the ionic conduction of CMC-PVA-NH4NO3. Blended biopolymer electrolytes (BBEs) based on carboxymethyl cellulose–polyvinyl alcohol (CMC-PVA) doped with ammonium nitrate (NH4NO3) were obtained via casting solution technique incorporated with PEG and EC, which acted as plasticizers. Electrical impedance spectroscopy (EIS) was conducted to evaluate the effect of plasticization on the ionic conduction properties. The ionic conductivity improved from 1.70 × 10−3 S/cm for un-plasticized BBEs to 3.92 × 10−3 S/cm for plasticized BBEs with EC and 3.00 × 10−3 S/cm for plasticized BBEs with PEG. The improvement indicated that the plasticizers weakened the Coulombic force and promoted further dissociation in the ionic dopant. The highest ionic conductivity was achieved for BBEs plasticized with EC, thereby suggesting the suitability of EC as plasticizer in this present system. The BBE system showed the Arrhenius characteristic at elevated temperatures and demonstrated increasing ionic conductivity. Dielectric properties of all BBE systems were found to improve upon the addition of EC and PEG, demonstrating their correlation with ionic conductivity.

Bahasa Abstract

Etilen Karbonat dan Polyethylene Glycol (PEG) sebagai Pemlastis yang Efisien dalam Polymer Electrolyte Berbasis CMC-PVA-NH4NO3. Kajian ini berkenaan dengan penyiasatan pengaruh campuran plastik (polietilena glikol [PEG] and etilena karbonat [EC]) pada kekonduksian ion di dalam CMC-PVA-NH4NO3. Elektrolit biopolimer campuran yang diadaptasi berdasarkan kandungan karboksimetil selulosa-polivinil alkohol (CMC-PVA) yang didopkan dengan ammonium nitrat (NH4NO3) dihasilkan melalui teknik tebaran larutan yang mengandungi PEG dan EC. Spektroskopi impedan elektrik (EIS) digunakan untuk menilai kesan campuran plastik kepada sifat pengaliran ionik. Kekonduksian ionik telah meningkat kepada 1.70 x 10-3 S/cm untuk campuran plastik EC dan 3.00 x 10-3 S/cm untuk campuran plastik PEG. Penambahbaikan itu sepadan dengan keupayaan campuran plastik untuk melemahkan daya Kulumbik dan meningkatkan penceraian selanjutnya dalam ionik dopan. Kekonduksian ionik tertinggi dicapai untuk BBEs yang mengandungi EC dan menunjukkan kesesuaian EC sebagai campuran plastik dalam sistem ini. Sistem BBEs menunjukkan ciri-ciri Arrhenius pada suhu tinggi dan menunjukkan peningkatan kekonduksian ion. Sifat-sifat dielektrik untuk semua sistem BBEs didapati bertambah baik apabila penambahan EC dan PEG dan menunjukkan perkaitan antara hubungan mereka dengan corak kekonduksian.

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