Synthesis and properties of polyaniline–cellulose acetate blends: The use of sugarcane bagasse waste and the effect of the substitution degree

Cerqueira, Daniel Alves; Valente, Artur J.M.; Filho, Guimes Rodrigues; Burrows, Hugh D.

doi:10.1016/j.carbpol.2009.04.016

Cited by 54 publications

(30 citation statements)

References 41 publications

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“…O AC pode ser usado em processos de separação por membranas, tais como hemodiálise, nanofiltração e osmose inversa [11] , matrizes para libertação controlada de fármacos [12] , sensores e proteção de filmes ópticos [13,14] , separação de gases [15] e preparação de filmes de alumina [16] . 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] .…”

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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“…Chitosan, starch, pectin, methyl cellulose and cellulose acetate are natural polymers, which have been proposed by researchers to develop SBP electrolytes [3,6,7]. Among these natural polymers, cellulose acetate (CA) is an important natural polymer, which is the acetate ester of cellulose and very attractive for its abundance in nature, low cost, film forming nature and easy disposal [8]. The CA has polar groups that possess lone pair electrons, which facilitates the ionic conduction.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of biopolymer electrolyte based on cellulose acetate for potential applications in energy storage devices

Monisha

Selvasekarapandian

Mathavan³

et al. 2016

J Mater Sci: Mater Electron

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In this present work, the solution casting technique was utilized to develop the proton conducting solid biopolymer electrolyte by the complex formation of cellulose acetate (CA) with the ammonium thiocyanate (NH 4 SCN) salt. The crystalline nature and complex formation of CA with different concentrations of NH 4 SCN were investigated using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopic techniques. The XRD analysis revealed that the amorphous natures of the CA complex were increased with increase of NH 4 SCN salt concentration, which leads to the higher ionic conductivity. The FTIR analysis confirmed the complex formation between CA and salt matrix. Differential scanning calorimetry (DSC) was used to predict the glass transition temperature (T g ) values, which reveals that the T g value increase with respect to the increase of NH 4 SCN concentration. The electrical conductivity was measured using AC impedance analyzer, which showed that the magnitude of ionic conductivity increases with an increase in salt concentration up to 50CA:50NH 4 SCN. The 50CA:50NH 4 SCN has maximum ionic conductivity value of 3.31 9 10 -3 S cm -1 . Transference number measurement was carried out to investigate the nature of the charge transport species in the polymer electrolyte. The proton battery was constructed with the highest conducting polymer electrolyte 50CA:50NH 4 SCN and its open circuit voltage with load were studied. Hence, the present investigation paves the way for the development of fuel cell and primary proton battery applications.

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“…Since blending is always used to improve polymer properties, it is used to modify the physical and chemical structures of the macromolecular compounds [10][11][12]. Miscible polymer blend led to the formation of new material possessing completely different properties, than those of the two homopolymers which might possess better tensile strengh.…”

Section: Introductionmentioning

confidence: 99%

Use of Blend Technique for Adjustment of Biodegradable Cellulose Acetate to Fiber Applications

Al-Dhafeer¹,

Abdel‐Naby²

2017

Asian J. Chem.

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Cellulose acetate is a semi-ordered polymer, used in various plastic applications. To adjust this biodegradable polymer to fiber application, the polymer is blended through its amorphous matrix with acrylonitrile copolymers to thermally support the polymer. The blending process, assisted with ultrasonic waves, led to the formation of a homogeneous matrix up to 25 % of the copolymers content. A unique glass transition temperature indicates the formation of new macromolecular matrix as a result of each blend sample. The results revealed that the blend samples exhibited higher thermal stability as shown from thermal analysis as compared to cellulose acetate. The mechanical properties were also greatly improved. Thus, blending cellulose acetate with the prepared copolymers enable it to withstand high temperature, which adjust it for fiber applications.

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Synthesis and properties of polyaniline–cellulose acetate blends: The use of sugarcane bagasse waste and the effect of the substitution degree

Cited by 54 publications

References 41 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

Preparation and characterization of biopolymer electrolyte based on cellulose acetate for potential applications in energy storage devices

Use of Blend Technique for Adjustment of Biodegradable Cellulose Acetate to Fiber Applications

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