Adipic acid interaction enhances the mechanical and thermal stability of natural polymers

Mitra, Tapas; Sailakshmi, G.; Gnanamani, A.; Mandal, Asit Baran

doi:10.1002/app.36957

Cited by 17 publications

(12 citation statements)

References 44 publications

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“…This indicated no change in the main backbone of the saccharide structure of neat CS. A similar observation was found by Mitra et al [27]; and Dhawade and Jagtap [30]. From FTIR spectra of EP-modified CS/CC, it can be seen that the peak intensity at 1,547 cm -1 was increased due to the bending vibration of the secondary amine that was synthesized by the reaction between -NH 2 and EP.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 85%

“…This means that the crosslinkages formation from CS-EP and CS-ADP enhanced the thermal degradation of CS/CC biocomposite films at high decomposition temperature. Better thermal degradation was also found by Mitra et al [27] in their study by using ADP as crosslinking agent in chitosan film. As a comparison presented in Table 3, the EP-modified CS/CC exhibited the highest percentage of char residue at temperature 600°C as compared to modified CS/CC with ADP or GLA.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 54%

“…The better interfacial interaction in the presence of crosslinking agent effectively increased the stiffness of CS/CC biocomposite films. Mitra et al [27] reported the modified biopolymer with crosslinking agent had enhanced the stiffness of biopolymer due to the presence of crosslinkages. In addition, CS/CC modified with EP presented about 6.4 % higher modulus of elasticity as compared to unmodified CS/CC, as reported in Table 1; whereas, modified CS/CC with ADP showed around 3.3 % higher than unmodified CS/CC.…”

Section: Tensile Propertiesmentioning

confidence: 98%

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A comparative study of different crosslinking agent-modified chitosan/corn cob biocomposite films

2015

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The effect of corn cob (CC) content and crosslinking agent on tensile, morphological, thermal properties, gel fraction and enzymatic degradation of chitosan (CS)/corn cob (CC) biocomposite films was studied. Epichlorohydrin (EP) and adipic acid (ADP) as crosslinking agents were added to improve the properties of CS/CC biocomposite films. The addition of CC decreased the tensile strength and elongation at break, but increased the modulus of elasticity of CS/CC biocomposite films. The EP-modified CS/CC exhibited higher tensile and thermal properties than ADP-modified CS/CC. The formation of crosslinkages between CS and EP or CS and ADP was proven by Fourier transform infrared studies. The modified CS/CC biocomposite films with ADP and EP, respectively, showed better interface interaction, as demonstrated in scanning microscopy electron. Furthermore, the incorporation of CC in CS increased the weight loss of enzymatic degradation of biocomposite films. Moreover, EP-modified CS/CC shows better resistance to hydrolysis in a-amylase enzymatic degradation than ADP-modified CS/CC. The gel fraction of CS/CC biocomposite films increases with the increasing CC content, whereas the gel fraction of modified CS/CC with EP is higher compared to modified CS/CC with ADP. The novelty of our research showed that the modified biocomposite films with EP have the highest tensile and thermal properties, also gel content than others biocomposite films. The biocomposite films modified with ADP confer plasticization effect compared to unmodified and other modified biocomposite films.

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 85%

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 54%

Section: Tensile Propertiesmentioning

confidence: 98%

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A comparative study of different crosslinking agent-modified chitosan/corn cob biocomposite films

2015

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“… A utilização de ácido adípico ao invés do acético para dissolver a quitosana derivada de α-quitina, pois ele não só atua como solvente, mas também melhora as propriedades mecânicas do material sem torna-lo citotóxico ou quebradiço (CHEN et al, 2008;GHOSH et al, 2012;MITRA et al, 2012;CAI et al, 2013;SAILAKSHMI et al, 2013). 14 1.…”

Section: Exemplos Desses Sãounclassified

“…Esse composto também é utilizado em excipientes e formulações farmacêuticas e na indústria de alimentos, onde pode agir auxiliando na tamponação, fermentação, gelificação, acidificação e conservação (MITRA et al, 2012;GHOSH et al, 2012;CHEN et al, 2008;ROWE et al, 2009). …”

Section: Uso De áCido Adípico Com Quitosanaunclassified

Desenvolvimento de géis e esponjas de quitosana e blendas quitosana/gelatina em ácido adípico

Pepino¹

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Desenvolvimento de géis e esponjas de quitosana e blendas quitosana/gelatina em ácido adípicoChitosan is a natural polymer studied in various fields such as environmental, food, pharmaceutical, biomedical and biotechnology. It can be obtained from different polymorphic forms of chitin, of which the form β has proven advantageous because it promotes more homogeneous and chemical modifications leads to a final product less allergenic. Chitosan can be combined with other compounds and thus further improve its properties. The aim of this study was to analyze how the use of adipic acid, replacing acetic acid affects the properties of gels and sponges of chitosan and chitosan/gelatin, which were subsequently crosslinked with EDC/NHS. The techniques used for these studies were: rheology, FTIR, SEM, absorption in PBS and cytotoxicity assays. In rheology, it was observed that increasing the concentration of chitosan was possible to prepare more elastic and viscous gels. The same occurs in the presence of gelatin or EDC/NHSO. The effect of the use of adipic acid to replace the acetic acid was also shown on rheological measurements, because the gels with 2% chitosan or chitosan/gelatin without EDC/NHS were more elastic and more viscous when the adipic acid has been used. The FTIR spectra showed the presence of interactions between chitosan and gelatin and the formation of amide II Bonds after crosslinking with EDC/NHS. In the preparation of the sponges it was observed that the gels of chitosan with adipic acid generated unstable sponges crumbled during neutralization, but this instability does not occur with the blend. Sponges prepared with the blend were studied after neutralization and SEM showed that the use of EDC/NHS altered the morphology leading to the formation of interconnected pores. The use of acetic acid increases the absorption in PBS for sponges without EDC/NHS, while for sponges with EDC/NHS the absorption is greater when adipic acid was used. All sponges were non-cytotoxic making them promising materials to be studied for applications in the medical field, such as dressing materials, implants, controlled drug release.

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Chitosan‐based gel film electrolytes containing ionic liquid and lithium salt for energy storage applications

Chupp

Shellikeri

Palui

et al. 2015

J of Applied Polymer Sci

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Fabrication, characterization, and a comparative study have been performed for chitosan-based polymer electrolytes using two different dispersion media. Chitosan gel film (solid) electrolytes are fabricated using acetic acid or adipic acid as the dispersant for chitosan in combination with ionic liquid and lithium salt. This quaternary system of chitosan, acetic acid or adipic acid, 1-butyl-3-methylimadazolium tetrafluoroborate (ionic liquid), and lithium chloride is formed as an electrolyte for potential secondary energy storage applications. The ionic conductivities, thermal, structural, and morphological properties for these electrolytes are compared. The ionic conductivities for chitosan/adipic acid (CHAD) and for chitosan/acetic acid (CHAC) systems are in the range of 3.71 3 10 24 24.6 3 10 23 and 1.3 3 10 24 23.2 3 10 23 S cm 21 , respectively. The thermal stability of CHAD-based electrolytes is determined to be higher than that of CHAC-based electrolytes. Preliminary studies are performed to determine the electrochemical stability of these materials as solid film electrolytes for electrochemical supercapacitors. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42143.

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Adipic acid interaction enhances the mechanical and thermal stability of natural polymers

Cited by 17 publications

References 44 publications

A comparative study of different crosslinking agent-modified chitosan/corn cob biocomposite films

A comparative study of different crosslinking agent-modified chitosan/corn cob biocomposite films

Desenvolvimento de géis e esponjas de quitosana e blendas quitosana/gelatina em ácido adípico

Chitosan‐based gel film electrolytes containing ionic liquid and lithium salt for energy storage applications

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