Synthesis of Conductive Polypyrrole/Polyurethane Foams via a Supercritical Fluid Process

Fu, Yueping; Palo, Daniel R.; Erkey, Can; Weiß, Robert

doi:10.1021/ma9710747

Cited by 43 publications

(50 citation statements)

References 11 publications

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“…This ratio is in agreement with a value of w4:1 reported by Kang et al [22] for PPy complexes synthesized in acetonitrile. Similar values have also been reported for PPy complexes in polyurethane foams [23].…”

Section: Properties Of Ppy/pcps Compositessupporting

confidence: 88%

Supercritical carbon dioxide processing of conducting composites of polypyrrole and porous crosslinked polystyrene

Kurosawa

Teja

Kowalik

et al. 2006

Polymer

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Section: Properties Of Ppy/pcps Compositessupporting

confidence: 88%

Supercritical carbon dioxide processing of conducting composites of polypyrrole and porous crosslinked polystyrene

Kurosawa

Teja

Kowalik

et al. 2006

Polymer

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“…Armes et al reported that both the pyrrole monomer and Fe(CF 3 SO 3 ) 3 oxidant are soluble in Sc-CO 2 , allowing the chemical fabrication of PPy films without harsh solvents [107]. Similarly, several CP composites have been fabricated by simple two-step processing using Sc-CO 2 as a solvent [108][109][110][111]. In the first step, porous matrices of polyethylene (PE) [108], polystyrene (PS) [109], or polyurethane (PU) [110,111] were loaded with Sc-CO 2 -solubilized oxidant (FeCl 3, Fe(CF 3 SO 3 ) 3 , Fe(CF 3 CO 2 ) 3 , or I 2 ).…”

Section: Supercritical Fluid Modificationsmentioning

confidence: 99%

Nanostructured Conductive Polymers as Biomaterials

Green

Baek

Lovell

et al. 2010

Nanostructured Conductive Polymers

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Conductive polymers (CPs) are an emerging technology in the field of biomaterials. While CPs retain a predominantly investigative role in the field of medical implants, they have shown potential across a wide range of applications, including neural interfaces, biosensors, nerve grafts, and drug-delivery devices.CPs have been extensively explored for addressing the limitations of conventional neuroprosthetic implant devices which employ metallic electrodes to interface with neural tissue. In this application CPs have the potential to provide a conductive interface with properties more suited to soft-tissue integration. Unlike conventional conductive materials CPs are relatively soft, with a textured surface conducive to cell attachment. The high surface area relative to the geometric base area means these materials also have good charge-transfer properties, with low impedance and negligible bilayer capacitance, a substantial limitation of existing neural-stimulation electrode technologies. These types of properties have resulted in much investigation of conductive polymers for a range of other medical applications, including biosensors, nerve regeneration templates, and for drug-delivery applications.

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“…Though numerous composites of nonconducting and selfconducting polymers are known, [9][10][11][12][13][14] up to the present, the use of PUR as a nonconducting polymer matrix has rarely been described. [15][16][17] Although the preparation of composites with linear thermoplastic polyurethane (TPU) is easy and can be carried out using different methods with the aid of solvents, [2,[18][19][20][21][22][23][24][25][26][27][28][29] none of these methods is suitable for preparation of composites with cross-linked polyurethanes. Because of the high reactivity of isocyanates, the PUR formation must be carried out in a solvent-free manner, for example by mixing the liquid isocyanate and polyol compounds, pouring the mixture into a mould, and curing it in the mould to directly yield the shaped resin.…”

Section: Introductionmentioning

confidence: 99%

Conducting Composites of Polyurethane Resin and Polypyrrole: Solvent‐Free Preparation, Electrical, and Mechanical Properties

Deligöz

Tieke

2006

Macro Materials & Eng

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Three methods were used for solvent-free preparation of conducting composites of PUR and PPy. In all cases, PUR was prepared from TDI and hydroxol 15-W as polyol cross-linker, whereas PPy was obtained upon oxidative coupling of Py using ferric chloride as oxidant. In method 1, PPy powder was dispersed in hydroxol. After addition of TDI the mixture was cured to yield the final product. In method 2, ferric chloride and Py were dissolved in hydroxol and a PPy dispersion was obtained. Then TDI was added and the final product was obtained upon curing. In method 3, Py was dissolved in TDI and ferric chloride dissolved in hydroxol. Then the two solutions were mixed and cured resulting in the simultaneous formation of PPy and PUR. Method 1 led to composites with a specific electrical conductivity s of 10 À10 S Á cm À1 and a Shore A hardness of 40 to 55. Using methods 2 and 3, composites with s values of 10 À7 S Á cm À1 and a hardness of 30 to 40 were obtained. Presence of moisture increased the s values and decreased the hardness. Due to the solvent-free preparation, the maximum PPy content of the samples was limited to 10 wt.-%. The studies also demonstrated that the conductivity was mainly dependent on the amount of ferric chloride present in the sample and not on the PPy content, suggesting that the conductivity was ionic.Flow diagram of different preparation methods for PUR-PPy composites.

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Synthesis of Conductive Polypyrrole/Polyurethane Foams via a Supercritical Fluid Process

Cited by 43 publications

References 11 publications

Supercritical carbon dioxide processing of conducting composites of polypyrrole and porous crosslinked polystyrene

Supercritical carbon dioxide processing of conducting composites of polypyrrole and porous crosslinked polystyrene

Nanostructured Conductive Polymers as Biomaterials

Conducting Composites of Polyurethane Resin and Polypyrrole: Solvent‐Free Preparation, Electrical, and Mechanical Properties

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