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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Optimum Conditions for Selective Separation of Kraft Lignin) ผู้เขียน: Pawadee Methacanon, Ubolrat Weerawatsophon, Monnapat Thainthongdee,  นางพรทิพย์ เล็กพิทยา, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractLignin has been investigated over the last few decades as a promising natural alternative to phenolic resin (phenol-formaldehyde), due to their structural similarity. In the present work, lignin was precipitated from the Kraft black liquor of Eucalyptus camaldulensis Dehn. at pH 2, 4 and 6, respectively in order to determine the optimal separation conditions. A comparison study was performed among the lignin samples obtained, based on yield, average molecular weight, chemical structure and thermal stability. The results showed that the best conditions occurred with lignin precipitation at pH 4. For low molecular weight (MW) lignin, each selective extraction was carried out using dichloromethane, acetone and methanol to study the effects of the lignin to solvent ratio, and extraction time on the lignin yield. Physico-chemical characterization of the low MW lignin was also carried out to evaluate the most suitable lignin for adhesive purposes. The results showed a ratio of 1:5 (lignin:solvent) and an extraction time of 1 h were sufficient for extraction. Dichloromethane-soluble lignin with a molecular weight of approximately 940 g mol-1 would be best for the adhesive formulation in future work. |
 Researcherนาง พรทิพย์ เล็กพิทยา, ผู้ช่วยศาสตราจารย์ที่ทำงาน:ภาควิชาวิศวกรรมวัสดุ คณะวิศวกรรมศาสตร์ สาขาที่สนใจ:Polymer composite, Lignin extraction from agricultural product, Conductive polymer, Surface modification using admicellar polymerization technique Resume |