Haras, Mohamed-Rashid Ahmed Mohamed Haras
(2010)
Preparation, Characterization And Application Of
Lignin Graft Copolymer As A Drilling Mud Additive.
Masters thesis, Universiti Sains Malaysia.
Abstract
Water soluble lignin graft copolymer (LGC) was prepared from oil palm empty
fruit bunch (OPEFB) fiber as a renewable biomass source. Beforehand, Kraft lignin
(KL) was extracted by exploiting the OPEFB fiber Kraft pulping residue. The KL
extraction was accomplished through the acid precipitation of black liquor which was
obtained from the Kraft pulping process. KL was then grafted with acrylic acid (AA) by
using p-toluenesulfonic acid (PTS) as a catalyst in the condensation process via bulk
technique. The resulting copolymer was characterized by Fourier transform infrared
(FTIR) spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric
analysis (TGA). The FTIR spectrum of the product showed absorption due to the
presence of ester bonds as a proof of grafting.
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