Preparation and evaluation of microstructure, dielectric and conductivity (ac/dc) characteristics of a polyaniline/poly N-vinyl carbazole/Fe3O4 nanocomposite

被引：15
作者：
Haldar, Ipsita [1 ]
Biswas, Mukul [1 ]
Nayak, Arabinda [2 ]
机构：
[1] Presidency Univ, Dept Chem & Biochem, Kolkata 700073, India
[2] Presidency Univ, Dept Phys, Kolkata 700073, India
来源：
JOURNAL OF POLYMER RESEARCH | 2012年 / 19卷 / 09期
关键词：
Nanocomposites; Binary polymer; Dielectric constant; Impedance spectra; Ac conductivity; IN-SITU POLYMERIZATION; ACETYLENE BLACK; ELECTRICAL-CONDUCTIVITY; LATEX-PARTICLES; RECENT PROGRESS; COMPOSITES; POLYPYRROLE; POLY(N-VINYLCARBAZOLE); VINYLCARBAZOLE; OXIDE;
D O I：
10.1007/s10965-012-9951-0
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A poly N-vinyl carbazole-Fe3O4 hybrid composite was prepared by solid state polymerization of N-vinyl carbazole (NVC) monomer in presence of Fe3O4 powder. This hybrid composite was dispersed in aqueous medium containing a known amount of potassium perdisulfate (KPS) as oxidant under constant sonication. A known amount of aniline (ANI) was injected in the system which started changing color and ultimately a black mass of (PANI-PNVC-Fe3O4) separated out. The composite was characterized by FTIR, FESEM and HRTEM analyses. XRD analyses using Williamson-Hall plot revealed average particle size of the PANI-PNVC-Fe3O4 composite to be around 34 nm. HRTEM analyses confirmed the particle size to be in the range 25-40 nm. The dielectric constants of PNVC-Fe3O4 system was low at 0.1-25 kHz whereas the PANI encapsulated PNVC-Fe3O4 nanocomposites showed significantly higher values of dielectric constant (>5500) at 0.1 kHz implying that the interfaces between grain and grain boundary of the composite play a dominant role for enhancing dielectric properties of the system. The ac conductivity was found to be independent of frequency in the range 10(2)-10(3) Hz for all the nanocomposites implying contribution of free charges and rise thereafter appreciably in the frequency range of 1-25 kHz due to trapped charges in the grain boundary.
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页数：9
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