Modification of Chitosan for Preparation of Poly(N-isopropylacrylamide/ O-nitrochitosan Interpenetrating Polymer Network

Rahman, Norliza Abd; Hanifah, Sharina Abu; Zani, A. M N; Ahmad, Azizan

doi:10.17576/jsm-2015-4407-11

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…The proton assignments of O-nitrochitosan pH 6 were as follows (ppm): 1 H NMR (D 2 O):2.01 (CH 3 , acetamido group of chitosan), 4.70 (H1), 3.00 (H2), 3.77 (H3), 3.89 (H4), 3.65 (H5), 3.91 (H6). The proton assignments of chitosan were as follows (ppm): 1.96 (CH 3 , acetamido group of chitosan), 4.70 (H1), 3.06 (H2), 3.75 (H3), 3.80 (H4), 3.63 (H5), 3.80, 3.65 (H6) [19]. The proton at C-6 of glucosamine ring of O-nitrochitosan, at both pH 1 and pH 6, were higher than the proton in chitosan due to the substitution of nitro group at C6 in both materials; thus, the electronegativity of the proton shifted to the higher field.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices

et al. 2019

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For the past decade, much attention was focused on polysaccharide natural resources for various purposes. Throughout the works, several efforts were reported to prepare new function of chitosan by chemical modifications for renewable energy, such as fuel cell application. This paper focuses on synthesis of the chitosan derivative, namely, O-nitrochitosan which was synthesized at various compositions of sodium hydroxide and reacted with nitric acid fume. Its potential as biopolymer electrolytes was studied. The substitution of nitro group was analyzed by using Attenuated Total Reflectance Fourier Transform Infra-Red (ATR-FTIR) analysis, Nuclear Magnetic Resonance (NMR) and Elemental Analysis (CHNS). The structure was characterized by X-ray Diffraction (XRD) and its thermal properties were examined by using differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Whereas, the ionic conductivity of the samples was analyzed by electrochemical impedance spectroscopy (EIS). From the IR spectrum results, the nitro group peaks of O-nitrochitosan, positioned at 1646 and 1355 cm -1 , were clearly seen for all pH media. At pH 6, O-nitrochitosan exhibited the highest degree of substitution at 0.74 when analyzed by CHNS analysis and NMR further proved that C-6 of glucosamine ring was shifted to the higher field. However, the thermal stability and glass transition temperatures were decreased with acidic condition. The highest ionic conductivity of O-nitrochitosan was obtained at ~10 −6 cm -1 . Overall, the electrochemical property of new O-nitrochitosan showed a good improvement as compared to chitosan and other chitosan derivatives. Hence, O-nitrochitosan is a promising biopolymer electrolyte and has the potential to be applied in electrochemical devices.

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Section: Resultsmentioning

confidence: 99%

“…The O-nitrochitosan powder was prepared according to the previous work, but with a modification of NaOH volume used [19]. The O-nitrochitosan powder was prepared by adding an amount of chitosan in isopropanol solution and stirred.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices

et al. 2019

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“…Membranas poliméricas termossensíveis baseadas em quitosana (QUI) e poli(Nisopropilacrilamida) (PNIPAm) têm sido relatadas na literatura. Estas membranas são preparadas através da formação de redes poliméricas semi-interpenetrantes (sIPN) (MINGZHEN, et al, 2000;BOXIANG, et al, 2016) ou redes poliméricas entrecruzadas (IPN) (MA, et al, 2017;MINGZHEN, 2001;RAHMAN, et al, 2015) de quitosana com o homopolímero PNIPAm, previamente sintetizado via química usando iniciadores radicalares.…”

Section: Introductionunclassified

Membranas termossensíveis baseadas em redes poliméricas semi-interpenetrantes de Quitosana e Poli(N-isopropilacrilamida)

Braga

Flauzino

González

et al. 2019

RSD

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The present study aims to develop thermosensitive membranes with an intelligent mechanism of adhesion/release and potent antimicrobial action for the treatment of wounds. The membranes were prepared by electrosynthesis of the thermosensitive hydrogel poly (N-isopropylacrylamide) (PNIPAm) in the presence of chitosan (CHI). The material obtained is constituted by a semi-interpenetrating polymer network (sIPN) of CHI and PNIPAm. The chitosan is a natural biopolymer with activity bactericidal, anti-inflammatory and healing action. The commercial chitosan used was previously characterized in terms of its average molar mass (0.9312 * 105 g mol-1) by viscosimetric method and degree of deacetylation (86.23%), through conductometric titration. The PNIPAm hydrogel was incorporated to CHI polymer chain by electrochemical method using cyclic voltammetry technique. The sIPN CHI-PNIPAm membrane obtained was characterized by Fourier Transform Infrared Spectroscopy using the Attenuated Total Reflectance (FTIR-ATR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). FTIR-ATR spectra confirmed the polymerization of PNIPAm in the presence of CHI. TGA curve showed that sIPN membrane obtained has a composition of 33% chitosan and 55% PNIPAm. DSC thermal analysis showed a lower Tg of sIPN CHI-PNIPAm membrane compared to Tg of PNIPAm hydrogel. The phase transition temperature (LCST) of the sIPN CHI-PNIPAm membrane was determined by Ultaviolet-visible spectroscopy (UV-vis) the value found was 32 ° C.

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Insights into characteristics and thermokinetic behavior of potential energy-rich polysaccharide based on chitosan

et al. 2022

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Modification of Chitosan for Preparation of Poly(N-isopropylacrylamide/ O-nitrochitosan Interpenetrating Polymer Network

Cited by 6 publications

References 19 publications

Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices

Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices

Membranas termossensíveis baseadas em redes poliméricas semi-interpenetrantes de Quitosana e Poli(N-isopropilacrilamida)

Insights into characteristics and thermokinetic behavior of potential energy-rich polysaccharide based on chitosan

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