Modification of Eucalyptus and Spruce organosolv lignins with fatty acids to use as filler in PLA

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• 作者：Oihana Gordobil ; Itziar Egü ; é ; s ; Jalel Labidi ; ^{jalel.labidi@ehu.es" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Organosolv lignins ; Fatty acids ; Films ; Poly(lactic acid) ; Ductility
• 刊名：Reactive and Functional Polymers
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：104
• 期：Complete
• 页码：45-52
• 全文大小：1168 K

文摘

Spruce (softwood) and Eucalyptus (hardwood) woods were used as raw material for lignin extraction by organosolv process. Chemical, structural and thermal characterizations of the extracted lignin samples have been performed using HPLC, GPC, FT-IR, ³¹P NMR, ¹³C NMR, DSC and TGA. Both lignins showed high purity, being Spruce lignin (OS) which presented the highest Klason lignin content (93%) and lowest sugar (0.5%) and sulphur (0.04%) content. Extracted lignin samples were chemically modified with dodecanoyl chloride fatty acid, in order to modify its thermal properties as glass transition temperature (T_g). The noticeable increase in the molecular weight and sharp decrease of T_g can be appreciated. Esterified lignins were used as filler in poly(lactic acid) (PLA) films elaborated by solvent casting in different concentrations (1, 5, 10, 25 and 50%). Mechanical, thermal and water barrier properties of prepared films were investigated. The results showed that the addition of both modified lignins contributed to greater ductility and lower stiffness, providing plasticity to PLA.