Thermal behavior of Schiff bases from chitosan

Santos, José E. dos; Dockal, Edward R.; Cavalheiro, Éder Tadeu Gomes

doi:10.1007/s10973-005-0042-x

Cited by 73 publications

(21 citation statements)

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“…2c) did not show a significant change from that of chit-TG, just an increase in the intensity of the sharp peak at 1377 cm −1 which may be due to the stretching of C N bond formed between the remained free amino groups of chitosan and formaldehye cross-linker. Similar observations were reported [25].…”

Section: Characterization Of the Polymersupporting

confidence: 92%

“…The IR spectra of the chit-TG Schiff bases, Fig. 2b, presented a strong absorption bands at about 1635 cm −1 attributed to the C N vibrations characteristic of imines [24,25] which are not observed in chitosan. On the other hand, the strong band at 2580 cm −1 may be attributed to the S H bond of the inserted thioglyceraldehyde units [23,30].…”

Section: Characterization Of the Polymermentioning

confidence: 99%

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Adsorption of Hg2+, Cu2+ and Zn2+ ions from aqueous solution using formaldehyde cross-linked modified chitosan–thioglyceraldehyde Schiff's base

Monier

2012

International Journal of Biological Macromolecules

147

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Section: Characterization Of the Polymersupporting

confidence: 92%

Section: Characterization Of the Polymermentioning

confidence: 99%

Adsorption of Hg2+, Cu2+ and Zn2+ ions from aqueous solution using formaldehyde cross-linked modified chitosan–thioglyceraldehyde Schiff's base

Monier

2012

International Journal of Biological Macromolecules

147

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“…1a) were in accordance with a previous report [24]. The IR spectra of the CAGS and cross-linked CAGS ( Fig.…”

Section: Ftir Spectrasupporting

confidence: 91%

“…The bands appearing at 2865 and 2923 cm −1 are attributed to aromatic and aliphatic (C-H) groups which is not observed in chitosan but observed in biopolymeric Schiff's bases at 2850 and 2930 cm −1 . The bands at 1481 and 756 cm −1 are attributed to the (C C) and (C-H) stretching in the aromatic ring, respectively [23,24].…”

Section: Ftir Spectramentioning

confidence: 99%

Adsorption of Cr(VI) and As(V) ions by modified magnetic chitosan chelating resin

El-Reash

Otto

Kenawy

et al. 2011

International Journal of Biological Macromolecules

158

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“…Reaksi pembentukan basa schiff dengan beberapa modifikator telah dipublikasikan sebelumnya (Santos et al, 2005;Wiyarsi, 2008;Jiao et al,2011;Pramono et al, 2012 et al, 2000;Smitha et al, 2003;Iojoiu et al,2005). Material tersebut memilki stabilitas termal yang tinggi dan juga sifat mekaniknya yang cukup baik pula (Martins et al,2003), namun demikian modifikasi pada bahan tersebut perlu dilakukan agar menghasilkan material yang bermuatan, sehingga dapat digunakan sebagai membran penukar proton yang dapat diaplikasikan sebagai membran elektrolit.…”

Section: Pendahuluanunclassified

Composite of Chitosan Vanilin / Sulfonated Polystyrene as Polymer Electrolyte Membranes : Cationic Exchange Capacity, Swelling Degree and Thermal Properties

Pramono¹,

Purnawan²,

Hidayat³

et al. 2016

ALCHEMY J.Pen.Kim

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ABSTRAKPenelitian preparasi dan karakterisasi membran komposit elektrolit polistirena tersulfonasi (PST)/kitosan vanilin (KV) untuk mengetahui pengaruh komposisi PST dan KV terhadap sifat kimia dan fisika membran telah dilakukan. Polistirena dimodifikasi melalui reaksi sulfonasi menghasilkan PST, sedangkan modifikasi kitosan melalui pembentukan basa schift menghasilkan KV. Membran komposit dibuat dengan metode kasting dan dikarakterisasi gugus fungsi yang terkandung di dalamnya, sifat Kapasitas Tukar Kation (KTK), Derajat Pengembangan (DP), Thermogravimetric Analysis (TGA) dan morfologinya. Keberadaan puncak serapan imina pada data FTIR menunjukkan bahwa kitosan vanilin berhasil disintesis, demikian juga sulfonasi pada polistrirena muncul puncak serapan sulfonat. Hasil analisa KTK menunjukkan penambahan gugus sulfonat pada polistirena dan penambahan gugus fenolik pada kitosan meningkatkan nilai KTK. Semakin besar konsentrasi PST dan konsentrasi KV pada komposisi membran menyebabkan peningkatan nilai KTK. Sebaliknya, peningkatan konsentrasi PST pada komposisi membran menyebabkan penurunan nilai DP, sedangkan peningkatan konsentrasi KV meningkatkan nilai DP. Analisis termal menunjukkan bahwa degradasi termal membran terjadi pada tiga tahap yaitu tahap pertama pelepasan air, tahap kedua pemutusan gugus samping dan degradasi plasticizer, dan tahap ketiga yaitu pemutusan rantai utama kitosan dan polistirena. Kata kunci : kitosan vanilin, membran polimer elektrolit, polistirena tersulfonasi ABSTRACTResearch on the preparation and characterization of sulfonated polystyrene (PST)/chitosan vanillin (KV) composite as electrolyte membranes has been conducted in order to investigate the effect of PST and KV composition to its chemical and physical properties. Polystyrene was modified by sulfonation reaction to produces PST, meanwhile chitosan was modified by schift base reaction to produces KV. The composite membranes were prepared by casting method and were characterized in order to identify the functional groups contained in the composite, the cation exchange capacity (CEC), the Swelling Degree (SD), the thermal properties and the morphology. The peak of imine vibration in

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Thermal behavior of Schiff bases from chitosan

Cited by 73 publications

References 0 publications

Adsorption of Hg2+, Cu2+ and Zn2+ ions from aqueous solution using formaldehyde cross-linked modified chitosan–thioglyceraldehyde Schiff's base

Adsorption of Hg2+, Cu2+ and Zn2+ ions from aqueous solution using formaldehyde cross-linked modified chitosan–thioglyceraldehyde Schiff's base

Adsorption of Cr(VI) and As(V) ions by modified magnetic chitosan chelating resin

Composite of Chitosan Vanilin / Sulfonated Polystyrene as Polymer Electrolyte Membranes : Cationic Exchange Capacity, Swelling Degree and Thermal Properties

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