Physical and Thermal Characteristics of Lignin-PVA Thin Film Composites

Muhammad Ajaz Ahmed1*, Sadaf Mearaj2, Choi Joon Weon2

(1Institute of Green-Bio Science and Technology, Seoul National University,

2Graduate School of International Agricultural Technology, Seoul National University)

Abstract: In this study the thermal stability and surface morphology of lignin PVA thin film composites was investigated. Firstly lignin was isolated from pine saw dust biomass using GVL and a reagent combination of Dioxane: Acetic acid: HCl. These lignin fractions were subsequently subjected to their qualitative analyses such as DFRC and 2D-HSQC NMR for the quantification of their G units and β-O-4 linkages. Afterwards, a solution casting method was used to fabricate lignin PVA thin film composites. For this purpose, DMSO was used as a common solvent for both PVA and lignin. The casting solutions were prepared according to a weight ratio of 5%, 10%, 20% of total solution volume. The solutions were mixed thouroughly, sonicated twice to make a homogeneous solution and were carefully casted on glass plates. These plates were first put to freezing for overnight and then finally to freeze drying. After freeze drying, these films were peeled off carefully and subjected to their analysis of SEM, TGA, thickness.