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

Kurosawa, Shutaro; Teja, Amyn S.; Kowalik, Janusz; Tolbert, Laren M.

doi:10.1016/j.polymer.2006.02.095

Cited by 8 publications

(7 citation statements)

References 30 publications

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“…On the contrary, MOAs with long aspect ratio fibers render a larger amount of empty areas, thus preventing breakage and conferring plasticity upon material. Specific compressive strength measured for the toughest MOAs (NiDTA‐100: 12725 J kg −1 ; NiDTA‐50: 1662 J kg −1 ; and PdDTA: 258 J kg −1 ) is far higher than that found for the unique MOF‐aerogel mechanically characterized, and somewhat higher than many carbon, organic, ceramic, and metal aerogels, and comparable to some conventional polymeric foams like polystyrene, polyurethane, etc. (Figure b).…”

Section: Resultsmentioning

confidence: 81%

Chemically Resistant, Shapeable, and Conducting Metal‐Organic Gels and Aerogels Built from Dithiooxamidato Ligand

Vallejo-Sánchez

Amo‐Ochoa

Beobide

et al. 2017

Adv Funct Materials

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Metal‐organic gels (MOGs) appear as a blooming alternative to well‐known metal‐organic frameworks (MOFs). Porosity of MOGs has a microstructural origin and not strictly crystalline like in MOFs; therefore, gelation may provide porosity to any metal‐organic system, including those with interesting properties but without a porous crystalline structure. The easy and straightforward shaping of MOGs contrasts with the need of binders for MOFs. In this contribution, a series of MOGs based on the assembly of 1D‐coordination polymer nanofibers of formula [M(DTA)]n (MII: Ni, Cu, Pd; DTA: dithiooxamidato) are reported, in which properties such as porosity, chemical inertness, mechanical robustness, and stimuli‐responsive electrical conductivity are brought together. The strength of the MS bond confers an unusual chemical resistance, withstanding exposure to acids, alkalis, and mild oxidizing/reducing chemicals. Supercritical drying of MOGs provides ultralight metal‐organic aerogels (MOAs) with densities as low as 0.03 g cm−3 and plastic/brittle behavior depending on the nanofiber aspect ratio. Conductivity measurements reveal a semiconducting behavior (10−12 to 10−7 S cm−1 at 298 K) that can be improved by doping (10−5 S cm−1). Moreover, it must be stressed that conductivity of MOAs reversibly increases (up to 10−5 S cm−1) under the presence of acetic acid.

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Section: Resultsmentioning

confidence: 81%

Chemically Resistant, Shapeable, and Conducting Metal‐Organic Gels and Aerogels Built from Dithiooxamidato Ligand

Vallejo-Sánchez

Amo‐Ochoa

Beobide

et al. 2017

Adv Funct Materials

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“…Conjugated polymers are also of considerable interest, having a range of useful properties including various optical properties [ 10 ], photoluminescence [ 11 , 12 ], and electrical conductivity [ 13 , 14 ]. Chemical doping with a suitable acceptor dopant such as iodine results in the generation of free radicals (polarons) on the main chain of the conjugated polymers.…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystalline π-Conjugated Copolymers Bearing a Pyrimidine Type Mesogenic Group

Kawabata

Goto

2009

Materials

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Phenylene-thiophene-based liquid crystalline π-conjugated copolymers bearing mesogenic groups as side chains were synthesized via a Stille polycondensation reaction and confirmed to exhibit a nematic liquid crystal phase at appropriate temperatures. The formation of a nematic phase, but not a smectic phase indicates cooperation of the main chain and side chain in the formation of a nematic main-chain/side-chain liquid crystal phase. The generation of polarons in the main chain as charge carriers during in-situ vapor doping of iodine is confirmed to increase with a doping progresses, exhibiting Dysonian paramagnetic behavior typical of conductive polymers.

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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%

“…Then the pyrrole vapor was applied to the oxidant-loaded matrix to form PPy within the matrix by chemical polymerization. Kurosawa et al [109] and Shenoy et al [110] have reported that the amount of PPy formed was directly related to the amount of oxidant impregnated in the substrate. Shenoy et al further demonstrated that the use of ethanol helped to solubilize oxidant in Fe(CF 3 SO 3 ) 3 in Sc-CO 2 [110].…”

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

Cited by 8 publications

References 30 publications

Chemically Resistant, Shapeable, and Conducting Metal‐Organic Gels and Aerogels Built from Dithiooxamidato Ligand

Chemically Resistant, Shapeable, and Conducting Metal‐Organic Gels and Aerogels Built from Dithiooxamidato Ligand

Liquid Crystalline π-Conjugated Copolymers Bearing a Pyrimidine Type Mesogenic Group

Nanostructured Conductive Polymers as Biomaterials

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