Electrical conductivity of iodine doped poly(butadiene-co-2-vinyl pyridine) diblock copolymers

A unique feature of molecular iodine by far, is its ability to bind to polymeric materials. A plethora of natural and synthetic polymers develop complexes when treated with molecular iodine, or with a mixture of mole cular iodine and potassium iodide. Many unexpected findings have been encountered upon complexation of iodine and the polymer skeleton, including the color formation, the polymer morphology changes, the compl exation sites or regions, the biological activity, and the electrical conductivity enhancement of the complexes, with poly iodides (I n¯) , mainly I 3¯ and I 5¯, as the actual binding species. Natural polymers that afford such complexes with iodine species are starch (amylose and amylopectin), chitosan, glycogen, silk, wool, albumin, cellulose, xylan, and natural rubber; iodinestarch being the oldest iodinenatural polymer complex. By contrast, numerous synthetic polymers are prone to make com plexes, including poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), nylons, poly(Schiff base)s, poly aniline, unsaturated polyhydrocarbons (carbon nano tubes, fullerenes C 60 /C 70 , polyacetylene; iodinePVA being the oldest iodinesynthetic polymer complex.

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“…Stanković et al [321] prepared diblock copolymer of butadiene and 2vinylpyridine (M n = 25 × 10 3 to 225 × 10 3…”

Section: Butadienic Copolymersmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

163

127

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“…The following reactions have been suggested to occur between pyridine groups of P4VP phase into blend and I 2 9, 25: It is generally accepted that P4VP can form a charge transfer complex with iodine similar to that found with P2VP 26. This has been confirmed by the Raman spectroscopy studies indicating the conduction mechanism by I

_{−}^{3}

and I

_{−}^{5}

species in doped samples.…”

Section: Discussionmentioning

confidence: 69%

Conducting properties of iodine‐doped low‐density polyethylene–poly(4‐vinylpyridine) blends

Silva

Temperini²,

Barros

2002

J of Applied Polymer Sci

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The conductivities of blends of low-density polyethylene and poly(4-vinyl pyridine) (P4VP) were studied. The blends were synthesized by in situ sorption and thermal polymerization of 4-vinylpyridine in low-density polyethylene. They showed, after iodine doping, conductivities of 1.7 to 5.0 ϫ 10 Ϫ7 S cm Ϫ1 at 298 K, depending on the P4VP mass increment into the matrix. Their conductivities were one order of magnitude higher for measurements at 338 K. The optimum ratio of iodine to pyridine (n) which gave the highest conductivity was 0.21. The thermal stability of doped blends was acceptable for their uses as electrochemical devices.

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“…[1][2][3][4][5] However, its applications have been restricted by several problems such as poor mechanical properties and poor processability. [6][7][8][9][10][11][12][13] To overcome these drawbacks of Ppy, composites prepared by simply blending Ppy with various homopolymers were introduced. 7 In this situation, macroscopically connected Ppy domains become electrical current paths.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Recently, block copolymers have drawn considerable attention as new templates for in situ polymerization of conductive nanocomposites. 6,7,13,16 Block copolymers exhibit well-ordered microdomains of 10-100 nm due to incompatibility and connectivity between two block segments. 17 Once electrically conductive polymers are selectively incorporated into the microdomains of one block, these microdomains can be used as an electrical path.…”

Section: Introductionmentioning

confidence: 99%

“…Stankovic et al prepared nanocomposites with a conductivity of 10 23 S cm 21 by the exposure of polybutadiene-block-poly(2-vinylpyridine) copolymer to iodine vapor. 6 Ishizu et al 7 showed that the nanocomposites prepared by the exposure of polystyrene-block-poly(2-vinylpyridine) copolymer (PS-b-P2VP) to methyl iodide vapor exhibited large differences between the parallel and perpendicular conductivities. But, both nanocomposites did not exhibit high conductivity.…”

Section: Introductionmentioning

confidence: 99%

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