Synthesis and characterization of aminated lignin

Pan, Hong; Sun, Gang; Zhao, Tao

doi:10.1016/j.ijbiomac.2013.04.049

Cited by 107 publications

(69 citation statements)

References 7 publications

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“…The C-N bonding peak at 286 eV was detected in aminated lignin. 26 However, due to the trace content of N element and absence of C-N bond in original lignin, the peak at 285.86 eV should not be assigned to C-N. Therefore, the peak at 285.86 eV can be assigned to C-O, which was associated with the large content of O element.…”

Section: Chemical Properties Of Hbs Ligninmentioning

confidence: 99%

Preparation and characterization of high boiling solvent lignin-based polyurethane film with lignin as the only hydroxyl group provider

et al. 2015

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A novel diisocyanate-modified lignin-based polyurethane (LPU) film was facilely prepared using renewable lignin as the only hydroxyl group provider at ambient temperature and pressure for the first time. The lignin was extracted through a modified high boiling solvent (HBS) method with 1,4-dioxane as the solvent, and then dried through freeze drying. The ash content of the HBS lignin sample was about 0.25%, which was lower than for other lignins. The HBS lignin had a large number of hydroxyl groups, which indicated the potential value in substitution of polyols in the synthesis of polyurethane (PU). From the results, the LPU film possessed high performance in hardness, solvent resistance and hydrophilicity with no need for further modification. The LPU film also had high tensile strength with a maximum value of 41.6 MPa. In order to investigate the thermal properties of the LPU film, thermal gravimetric analysis (TGA) and thermogravimetric infrared analysis (TGA-FTIR) were performed, and the LPU film was stable at 114 C in air and an N 2 atmosphere. This study developed a novel LPU film which could show promising future applications as a coating and base.

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Section: Chemical Properties Of Hbs Ligninmentioning

confidence: 99%

Preparation and characterization of high boiling solvent lignin-based polyurethane film with lignin as the only hydroxyl group provider

et al. 2015

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“…The disappeared peak at 913 cm 21 of epoxy groups in IR curves of epoxy resins cured by aminated lignin showed that epoxy group had been completely exhausted by reacting with the aminated lignin hardener.…”

Section: Discussionmentioning

confidence: 99%

“…Structures of all epoxy resin samples were characterized with Fourier transform infrared spectroscopy (FTIR) on a Nicolet AT-380 spectrometer using potassium bromide pellets with acquisition of a spectral range of 4000-400 cm 21 at a resolution of 4 cm 21 and 32 accumulations. Thermal stability of lignin and its derivatives was measured using a Netzsch TG 209 F1 instrument operating from 25 C to 900 C at heating rate of 10 C/min under a nitrogen atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…2, a weak peak at 1648 cm 21 detected in curve c but absent in curve b was the absorbance of carbonyl groups conjugated with an aromatic ring which revealed that lignin structure indeed incorporated in the epoxy resin material. The vibrational bands of the aromatic ring were at 1615 cm 21 and 1510 cm 21 and two other peaks appeared at 1459 cm 21 and 1425 cm 21 attributed to methoxyl groups in lignin structure. The FTIR results showed the epoxy resin could be cured by the aminated lignin at a high temperature, indicating that the lignin derivative is applicable as a curing agent for epoxy resins.…”

Section: Ftir Of Curing Systemmentioning

confidence: 99%

“…2, the broad band at 3400-3500 cm 21 was strengthened with addition of the hardener because of the introduction of amine group and hydroxyl group into epoxy resin. In addition, the bands at 1230-1280 cm 21 , 913 cm 21 , and 750 cm 21 in the spectrum of curve a assigned to the epoxy group stretching also disappeared as the crosslinking of epoxy resin increased. Epoxy resin could react with W93 hardener at room temperature, explaining why the peak of epoxy group at 913 cm 21 became weaker as curve b showed.…”

Section: Ftir Of Curing Systemmentioning

confidence: 99%

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Thermal properties of epoxy resins crosslinked by an aminated lignin

Pan

Sun

Zhao

et al. 2014

Polymer Engineering & Sci

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Aminated lignin possessing significant amount of reactive amino groups was studied as a curing agent of epoxy resin. Fourier transform infrared spectroscopy results proved the reactivity of the aminated lignin with the epoxy resin. Both appearance features and scanning electron microscopy images indicated that the transparent and homogeneous epoxy resin films could be formed with the aminated lignin less than 40% in the hardener mixture. In addition, thermogravimetric analysis and dynamic thermomechanical analysis results revealed that the epoxy resin cured by aminated lignin had better thermal stability compared with ones cured by a common hardener. The mass loss of the epoxy resin cured by the aminated lignin before 300°C was small around only 2.5%. The Tg (the glass transition temperature) of epoxy resin sample after cured by mixed hardener increased from 79°C to 93°C. The obvious difference (70–84°C) of Td (the thermal deformation temperature) was also observed from the samples with and without the aminated lignin after cured at a high temperature. POLYM. ENG. SCI., 55:924–932, 2015. © 2014 Society of Plastics Engineers

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