Transport properties of polyaniline-cellulose-acetate blends

Planès, J.; Wolter, Andreas; Cheguettine, Y.; Proń, A.; Genoud, F.; Nechtschein, M.

doi:10.1103/physrevb.58.7774

Cited by 62 publications

(31 citation statements)

References 48 publications

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“…Outro interessante campo de aplicação do AC é a sua utilização como matriz para incorporação de, e.g., polímeros condutores [17] e macrociclos [18][19][20] . Além disso, blendas de AC e polianilina têm sido usadas para o desenvolvimento de dispositivos eletrônicos e eletrocrômicos [21][22][23] , e eletrodos seletivos [24] . Os derivados acetilados da celulose podem ser produzidos por dois tipos diferentes de reações de acetilação: homogênea e heterogênea [25] .…”

Section: Acetilação Da Celulose Do Bagaço De Cana-de-açúcarunclassified

Caracterização de acetato de celulose obtido a partir do bagaço de cana-de-açúcar por ¹H-RMN

Cerqueira¹,

Filho

Carvalho

et al. 2010

Polímeros

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Resumo: A celulose do bagaço de cana-de-açúcar foi usada para sintetizar acetato de celulose com diferentes graus de substituição, os quais foram caracterizados por 1 H-RMN através da relação entre as áreas dos picos dos átomos de hidrogênio presentes nos grupos acetato (-(C=O)OCH 3 ) e os picos dos hidrogênios ligados aos átomos de carbono dos anéis glicosídicos. A supressão de alguns sinais foi feita para remover sinais de ressonância da água residual nos materiais e também para remover sinais de impurezas no triacetato de celulose. Um método de deconvolução para o cálculo computacional do grau de substituição foi proposto. Os graus de substituição das amostras de acetato de celulose foram 2,94 e 2,60, o que está de acordo com os resultados por determinação química através de uma titulação ácido base. Palavras-chave: Acetato de celulose, bagaço de cana-de-açúcar, grau de substituição, 1 H-RMN, deconvolução. H-NMR Characterization of Cellulose Acetate Obtained from Sugarcane BagasseAbstract: Cellulose from sugarcane bagasse was used for synthesizing cellulose acetate with different degrees of substitution, which were characterized by 1 H-NMR through the relationship between the peak areas of the hydrogen atoms of the acetate groups (-(C=O)OCH 3 ) and the peaks of the hydrogen bonded to the carbon atoms of the glucosidic rings. Suppression of some signals was carried out in order to remove the residual water resonance in the materials and those related to impurities in cellulose triacetate as well. A deconvolution method for the computation of the degree of substitution of acetylation is proposed. The degrees of substitution for the cellulose samples were 2.94 and 2.60, in good agreement with those obtained by chemical determination through an acid-base titration.

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Section: Acetilação Da Celulose Do Bagaço De Cana-de-açúcarunclassified

Caracterização de acetato de celulose obtido a partir do bagaço de cana-de-açúcar por ¹H-RMN

Cerqueira¹,

Filho

Carvalho

et al. 2010

Polímeros

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“…Long-term mechanical and chemical stability of the polymeric materials are points of concern to make a successful sensor. A useful approach for the improvement of the processability of conducting polymers involves blending with suitable matrix * Author for correspondence (ba@matsc.iitkgp.ernet.in) polymers (Jousseaume et al 1998a, b;Planes et al 1998). An ammonia sensor based on conducting polypyrrole (PPy) was one of the early practical realizations of conducting polymer sensors.…”

Section: Introductionmentioning

confidence: 99%

Influence of dielectric constant of polymerization medium on processability and ammonia gas sensing properties of polyaniline

2011

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Polyaniline (PANI) was synthesized by the oxidation of aniline hydrochloride in the presence of ammonium persulphate and hydrochloric acid. The polymerization reaction was carried out in several batches in different solvent media by changing the volume ratio of N,N-dimethyl formamide (DMF) and water as binary solvent mixture. The dielectric constant of the polymerization medium for each batch reaction was determined by measuring the capacitance with change in frequency. The UV spectra of the synthesized polyaniline solutions helped us to optimize the ratio of the binary solvent to get sufficient polymer growth and processability. Thin film of processable polyaniline was then deposited on glass slides coated with polyvinyl alcohol (PVA) crosslinked with maleic anhydride (MA). FTIR and XRD studies of the coated film were also done. AFM studies further helped in the morphological study of the film deposited. Finally, conductivity and ammonia gas-sensing property of the polyaniline film were also studied.

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“…11 Although the physical meaning of x 0 and t is not clear, this model had been widely used to analyze charge transport in many polymer-mixture systems due to its universality and simplicity. [12][13][14][15][16][17] An alternative model is based on the Miller-Abrahams (MA) model for hopping conductivity in a disordered solid:…”

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confidence: 99%

Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules

Kim

Baldo

2016

AIP Advances

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Mixed host compositions that combine charge transport materials with luminescent dyes offer superior control over exciton formation and charge transport in organic light emitting devices (OLEDs). Two approaches are typically used to optimize the fraction of charge transport materials in a mixed host composition: either an empirical percolative model, or a hopping transport model. We show that these two commonly-employed models are linked by an analytic expression which relates the localization length to the percolation threshold and critical exponent. The relation is confirmed both numerically and experimentally through measurements of the relative conductivity of Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) :1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene (BmPyPb) mixtures with different concentrations, where the TCTA plays a role as hole conductor and the BmPyPb as hole insulator. The analytic relation may allow the rational design of mixed layers of small molecules for high-performance OLEDs.

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Transport properties of polyaniline-cellulose-acetate blends

Cited by 62 publications

References 48 publications

Caracterização de acetato de celulose obtido a partir do bagaço de cana-de-açúcar por ¹H-RMN

Caracterização de acetato de celulose obtido a partir do bagaço de cana-de-açúcar por ¹H-RMN

Influence of dielectric constant of polymerization medium on processability and ammonia gas sensing properties of polyaniline

Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules

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