FUNCTIONAL GROUPS AND STRUCTURAL CHARACTERIZATION OF UNMODIFIED AND FUNCTIONALIZED LIGNIN BY TITRATION, ELEMENTAL ANALYSIS, 1H NMR AND FTIR TECHNIQUES

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BAIRAMI HABASHI RAMIN; ABDOLLAHI MAHDI

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Journal: Iranian Journal of Polymer Science and Technology Year:2018 | Volume:30 | Issue:5 Page(s): 405-418

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Title

FUNCTIONAL GROUPS AND STRUCTURAL CHARACTERIZATION OF UNMODIFIED AND FUNCTIONALIZED LIGNIN BY TITRATION, ELEMENTAL ANALYSIS, 1H NMR AND FTIR TECHNIQUES

Author(s)

BAIRAMI HABASHI RAMIN | ABDOLLAHI MAHDI | Issue Writer Certificate

Keywords

LIGNINQ1

CHEMICAL STRUCTURE AND FUNCTIONAL GROUP CHARACTERIZATIONQ1

SPECTROSCOPYQ2

TITRATIONQ1

MOLECULAR WEIGHTQ3

Abstract

LIGNIN is the second most abundant polymer in the world after cellulose. Therefore, characterization of the structure and functional groups of LIGNIN in order to assess its potential applications in various technical fields has become a necessity. One of the major problems related to the characterization of LIGNIN is the lack of well-defined protocols and standards. In this paper, systematic studies have been done to characterize the structure and functional groups of LIGNIN quantitatively using different techniques such as elemental analysis, TITRATION and 1H NMR and FTIR techniques. LIGNIN as a black liquor was obtained from Choka Paper Factory and it was purified before any test. The LIGNIN was reacted with a-bromoisobutyryl bromide to calculate the number of hydroxyl and methoxyl moles. Using 1H NMR spectroscopic method on a-bromoisobutyrylated LIGNIN (BiBL) in the presence of a given amount of N, N-dimethylformamide (DMF) as an internal standard, the number of moles of hydroxyl and methoxyl groups per gram of LIGNIN was found to be 6.44 mmol/g and 6.64 mmol/g, respectively. Using aqueous TITRATION, the number of moles of phenolic hydroxyl groups and carboxyl groups of the LIGNIN were calculated as 3.13 mmol/g and 2.84 mmol/g, respectively. The findings obtained by 1H NMR and elemental analysis indicated to phenyl propane unit of the LIGNIN with C9 structural formula as C9 HAl3.84HAr2.19S0.2O0.8(OH)1.38(OCH3)1.42. Due to poor solubility of the LIGNIN in tetrahydrofuran (THF), acetylated LIGNIN was used in the GPC analysis, by which number-average MOLECULAR WEIGHT (M)n of the LIGNIN was calculated as 992 g/mol.

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APA: Copy

BAIRAMI HABASHI, RAMIN, & ABDOLLAHI, MAHDI. (2018). FUNCTIONAL GROUPS AND STRUCTURAL CHARACTERIZATION OF UNMODIFIED AND FUNCTIONALIZED LIGNIN BY TITRATION, ELEMENTAL ANALYSIS, ¹H NMR AND FTIR TECHNIQUES. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 30(5 ), 405-418. SID. https://sid.ir/paper/6397/en

Vancouver: Copy

BAIRAMI HABASHI RAMIN, ABDOLLAHI MAHDI. FUNCTIONAL GROUPS AND STRUCTURAL CHARACTERIZATION OF UNMODIFIED AND FUNCTIONALIZED LIGNIN BY TITRATION, ELEMENTAL ANALYSIS, ¹H NMR AND FTIR TECHNIQUES. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2018;30(5 ):405-418. Available from: https://sid.ir/paper/6397/en

IEEE: Copy

RAMIN BAIRAMI HABASHI, and MAHDI ABDOLLAHI, “FUNCTIONAL GROUPS AND STRUCTURAL CHARACTERIZATION OF UNMODIFIED AND FUNCTIONALIZED LIGNIN BY TITRATION, ELEMENTAL ANALYSIS, ¹H NMR AND FTIR TECHNIQUES,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 30, no. 5 , pp. 405–418, 2018, [Online]. Available: https://sid.ir/paper/6397/en

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