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Dielectric Behaviour of montmorillonite/cyanoethylated Cellulose Nanocomposites

Dielectric Behaviour of montmorillonite/cyanoethylated Cellulose Nanocomposites

Nadeesh Madusanka, Sai G Shivareddy, Mark D Eddleston, Pritesh Hiralal, Rachel A Oliver, Gehan A J Amaratunga

Carbohydr Polym. 2017 Sep 15;172:315-321.

PMID: 28606540

Abstract:

A dielectric nanocomposite based oncyanoethylatedcellulose (CRS) and MMT nanoclay was successfully prepared with different weight percentages (5%, 10% and 15%) of MMT. MMT nanoplatets obtained via sonication of MMT nanoclay in acetone for a prolonged period was used in the preparation of CRS-MMT nanocomposites. CRS-MMT thin films on SiO2/Si wafers are used to form metal-insulator-metal (MIM) type capacitors. At 1kHz CRS-MMT nanocomposites exhibited high dielectric constants (εr) of 71, 55 and 42 with low leakage current densities (10-6-10-7A/cm2) for nanocomposites with 5%, 10% and 15% weight of MMT respectively, higher than values of pure CRS (21), Na-MMT(10). Reduction of εr with higher MMT loading can be attributed to a network formation as evidenced via strong bonding interactions between CRS and MMT leading to a lower molecular mobility. The leakage is studied using conductive atomic force microscopy (C-AFM) indicates that leakage pathways are associated with MMT nanoplatelets embedded in the CRS polymer matrix.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9004415	Cellulose, cyanoethylated		9004-41-5	Price

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