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

被引：17

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.

引用

页数：9

共 42 条

[31] Novel polymer-ceramic nanocomposite based on high dielectric constant epoxy formula for embedded capacitor application [J].

Rao, Y ;

Ogitani, S ;

Kohl, P ;

Wong, CP .

JOURNAL OF APPLIED POLYMER SCIENCE, 2002, 83 (05) :1084-1090

[32] Synthesis, characterization and low frequency AC conduction of polyaniline/niobium pentoxide composites [J].

Ravikiran, Y. T. ;

Lagare, M. T. ;

Sairam, M. ;

Mallikarjuna, N. N. ;

Sreedhar, B. ;

Manohar, S. ;

MacDiarmid, A. G. ;

Aminabhavi, T. M. .

SYNTHETIC METALS, 2006, 156 (16-17) :1139-1147

[33] Water-dispersible conducting nanocomposites of polyaniline and poly(N-vinylcarbazole) with nanodimensional zirconium dioxide [J].

Ray, SS ;

Biswas, M .

SYNTHETIC METALS, 2000, 108 (03) :231-236

[34]

Rout SK, 2009, J ALLOY COMPD, V477, P510

[35] Polypyrrole/poly(methylmethacrylate) blend as selective sensor for acetone in lacquer [J].

Ruangchuay, L ;

Sirivat, A ;

Schwank, J .

TALANTA, 2003, 60 (01) :25-30

[36] A soluble and highly functional polyaniline-carbon nanotube composite [J].

Sainz, R ;

Benito, AM ;

Martínez, MT ;

Galindo, JF ;

Sotres, J ;

Baró, AM ;

Corraze, B ;

Chauvet, O ;

Dalton, AB ;

Baughman, RH ;

Maser, WK .

NANOTECHNOLOGY, 2005, 16 (05) :S150-S154

[37] Electrical properties of composites based on conjugated polymers and conductive fillers [J].

Tchmutin, IA ;

Ponomarenko, AT ;

Krinichnaya, EP ;

Kozub, GI ;

Efimov, ON .

CARBON, 2003, 41 (07) :1391-1395

[38]

Tsuji K, 1966, J POLYM SCI A, VA-1, P2028

[39] X-RAY LINE BROADENING FROM FILED ALUMINIUM AND WOLFRAM [J].

WILLIAMSON, GK ;

HALL, WH .

ACTA METALLURGICA, 1953, 1 (01) :22-31

[40]

YASSAR A, 1987, POLYM COMMUN, V28, P103

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