Specific interactions in blends containing Chitosan and functionalized polymers. Molecular dynamics simulations

Sandoval, Claudia; Castro, Cristian; Gargallo, Ligia; Radić, Deodato; Freire, Juan J.

doi:10.1016/j.polymer.2005.08.059

Cited by 36 publications

(27 citation statements)

References 16 publications

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“…The conductivity of polymer blend is better than the single polymers (Sandoval et al, 2005). Thus, it affects the conductivity of the polymer electrolytes (Utracki, 2002).…”

Section: Introductionmentioning

confidence: 99%

Electrical Studies of Carboxy Methycellulose-Chitosan Blend Biopolymer Doped Dodecyltrimethyl Ammonium Bromide Solid Electrolytes

Bakar¹,

Muhamaruesa²,

Aniskari³

et al. 2015

American Journal of Applied Sciences

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In this study, a polymer-blend system consist of Carboxy Methylcellulose (CMC)-Chitosan (CS) as blend biopolymer host and doped with various composition of Dodecyltrimethyl Ammonium Bromide (DTAB) were successfully prepared via solution casting techniques. The new system has been analyzed through Electrical Impedance Spectroscopy (EIS) from temperature 303 K until 393 K to determine the conductivity of biopolymer electrolytes in the frequency range of 50 Hz to 1 MHz and the voltage between 5 to 50 mV. The optimum conductivity (1.86×10 −6 S.cm) at ambient temperature obtained for composition of 5 wt.% DTAB. The temperature dependence of ionic conductivity was found to obeys the Arrhenius rule where R 2 ≈1 and thermally activated. The dielectric studies show a non-Debye behavior of SBEs based on the analyzed data using complex permittivity, ε* and complex electrical modulus, M* of the sample at selected temperature.

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“…The conductivity of polymer blend is better than the single polymers (Sandoval et al, 2005). Thus, it affects the conductivity of the polymer electrolytes (Utracki, 2002).…”

Section: Introductionmentioning

confidence: 99%

Electrical Studies of Carboxy Methycellulose-Chitosan Blend Biopolymer Doped Dodecyltrimethyl Ammonium Bromide Solid Electrolytes

Bakar¹,

Muhamaruesa²,

Aniskari³

et al. 2015

American Journal of Applied Sciences

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“…Lots of chitosan blends and composites with other polymers have been proposed in the literature, for example, chitosan/cellulose membrane [3,4], chitosan/starch [5], chitosan/gelatin [6] and chitosan/collagen [7]. The compatibility of chitosan with these polymers may be obtained since chitosan is considered as a strongly interacting polymer [8].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Chitosan/Agar Blends: Rheological and Thermal Studies

El-Hefian

Nasef

Yahaya

et al. 2010

J. Chil. Chem. Soc.

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In this work, a number of mixture aqueous solutions of chitosan/agar (CS/AG) at different ratios (considering chitosan as the main component) were prepared. The rheological properties i.e. shearing viscosity and shear stress of the blend solutions as a function of shear rate as well as the thermal properties of the blend films were investigated. Among the parameters studied were temperature, shearing time and storage time. Results showed that almost Newtonian behavior was observed at temperatures from 40 o C to 55 o C for the ratios 100/0, 90/10, 80/20 and 70/30. However, the proportions 60/40 and 50/50 showed a clear shear thinning behavior (pseudoplastic non-Newtonian behavior). It was also found that all the blend solutions obeyed the Arrhenius equation. In addition, the effect of shearing time on the shearing viscosity of all blends did not show any significant differences at all shearing times applied in this study except the proportion 50/50 wherein decreasing in shearing viscosity and shear stress was observed as the shearing time increased. Furthermore, different behaviors were observed for the blend solutions when the period of storage was extended to three weeks. The FTIR results and the differential scanning calorimetery (DSC) curves showed that the interaction between chitosan and agar can occur.

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“…Although its enhancing effect on Si-O-Ti connectivity and its strong adsorption ability to surfactants, organic acids, and dyes has been reported, [26,29] the mechanism of functional groups in various systems is different and needs to be clarified. [30] Undoubtedly, the induction mechanism of the chitosan film on the crystal orientation and the incorporation of Ti atoms into the framework is crucial for manufacturing high-quality TS-1 zeolite films. The catalytic activity of the TS-1 film was measured in a multiphase membrane reactor.…”

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confidence: 99%

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates

et al. 2006

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Zeolite films have attracted much attention from the scientific community because of their potential applications as selective membranes, chemical sensors, and microelectronic devices. [1][2][3] The performance of permeable films can be greatly improved by controlling the crystal orientation on the substrate surface. [4,5] Thus far, significant progress in directing the crystal orientation on the substrate surface has been made for LTA and UTD-1, especially for MFI-type zeolite films.[6]Wang and Yan reported a highly b-oriented pure silica MFI film on porous stainless steel synthesized by in situ crystallization. [7] They could manipulate the crystal orientation by using an in situ hydrothermal reaction method, and control over the orientation on the substrate surface was achieved by simply changing the composition of the synthesis solution. By using the seeded growth method, Tsapatsis and co-workers successfully created b-oriented siliceous zeolite ZSM-5 membranes with molecular recognition ability on porous alumina substrates. [8,9] Highly selective and permeable membranes were obtained based on a good understanding of both crystal growth and interaction between crystal grains and the substrate surface.[5] The separation factor of para-to ortho-xylene isomers could be up to several hundred while keeping the permeance of para-xylene high. Based on induction by surface matrices, Yoon and co-workers could pack silicalite-1 crystals of a uniform size over a glass surface in a desired orientation.[10]Compared with Al-ZSM-5 and silicalite-1, TS-1 zeolite possesses a variety of special features. In addition to the molecular sieving effect, TS-1 films catalyze oxidative reactions as well, including selective oxidation of alcohols, [11] epoxidation of alkenes, [12] hydroxylation of aromatics, [13] oxyfunctionalization of n-hexane to hexanols and hexanones, [14,15] and photocatalytic oxidation. [16] Obviously, the availability of highly oriented TS-1 films, especially along the b-axis, will trigger their application in innovative materials, microreactors, and even microelectronic devices. [17][18][19] TS-1 zeolite has the same tetrahedral framework as Al-ZSM-5 and silicalite-1 MFI zeolites. However, the introduction of Ti atoms into the framework requires a substantially longer hydrothermal reaction time. Several research groups have synthesized TS-1 monoliths, [20,21] films, [6,22,23] and membranes. [16,24] However, all the TS-1 films and membranes reported are randomly oriented, except in the work of Lee et al. who used poly(ethylene oxide) (PEO) as a template to direct the oriented growth of TS-1 films on glass.[6] To date, we have found no published work on the synthesis of b-oriented TS-1 films on porous substrates. Here, we report a new synthesis strategy for manufacturing b-oriented TS-1 films on porous a-Al 2 O 3 substrates. Chitosan will serve as the structure-directing matrix to induce the orientation of the crystal grains with the b-axes perpendicular to the substrate surface. Finally, the performance of the s...

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Specific interactions in blends containing Chitosan and functionalized polymers. Molecular dynamics simulations

Cited by 36 publications

References 16 publications

Electrical Studies of Carboxy Methycellulose-Chitosan Blend Biopolymer Doped Dodecyltrimethyl Ammonium Bromide Solid Electrolytes

Electrical Studies of Carboxy Methycellulose-Chitosan Blend Biopolymer Doped Dodecyltrimethyl Ammonium Bromide Solid Electrolytes

Preparation and Characterization of Chitosan/Agar Blends: Rheological and Thermal Studies

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates

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Specific interactions in blends containing Chitosan and functionalized polymers. Molecular dynamics simulations

Cited by 36 publications

References 16 publications

Electrical Studies of Carboxy Methycellulose-Chitosan Blend Biopolymer Doped Dodecyltrimethyl Ammonium Bromide Solid Electrolytes

Electrical Studies of Carboxy Methycellulose-Chitosan Blend Biopolymer Doped Dodecyltrimethyl Ammonium Bromide Solid Electrolytes

Preparation and Characterization of Chitosan/Agar Blends: Rheological and Thermal Studies

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al2O3 Substrates

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Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates